diff --git a/app/dispatcher/impl/sniffer_test.go b/app/dispatcher/impl/sniffer_test.go
index 6b10c17a3..ce252de4b 100644
--- a/app/dispatcher/impl/sniffer_test.go
+++ b/app/dispatcher/impl/sniffer_test.go
@@ -4,11 +4,11 @@ import (
 	"testing"
 
 	. "v2ray.com/core/app/dispatcher/impl"
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 )
 
 func TestHTTPHeaders(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	cases := []struct {
 		input  string
@@ -94,13 +94,13 @@ first_name=John&last_name=Doe&action=Submit`,
 
 	for _, test := range cases {
 		domain, err := SniffHTTP([]byte(test.input))
-		assert.String(domain).Equals(test.domain)
-		assert.Error(err).Equals(test.err)
+		assert(domain, Equals, test.domain)
+		assert(err, Equals, test.err)
 	}
 }
 
 func TestTLSHeaders(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	cases := []struct {
 		input  []byte
@@ -180,7 +180,7 @@ func TestTLSHeaders(t *testing.T) {
 
 	for _, test := range cases {
 		domain, err := SniffTLS(test.input)
-		assert.String(domain).Equals(test.domain)
-		assert.Error(err).Equals(test.err)
+		assert(domain, Equals, test.domain)
+		assert(err, Equals, test.err)
 	}
 }
diff --git a/app/dns/server/querier.go b/app/dns/server/querier.go
new file mode 100644
index 000000000..722c81632
--- /dev/null
+++ b/app/dns/server/querier.go
@@ -0,0 +1,20 @@
+package server
+
+import (
+	"time"
+
+	"v2ray.com/core/common/net"
+)
+
+type IPResult struct {
+	IP  []net.IP
+	TTL time.Duration
+}
+
+type Querier interface {
+	QueryDomain(domain string) <-chan *IPResult
+}
+
+type UDPQuerier struct {
+	server net.Destination
+}
diff --git a/app/dns/server/server.go b/app/dns/server/server.go
index 2fedbedf5..567cf4576 100644
--- a/app/dns/server/server.go
+++ b/app/dns/server/server.go
@@ -24,6 +24,17 @@ type DomainRecord struct {
 	A *ARecord
 }
 
+type Record struct {
+	IP         []net.IP
+	Expire     time.Time
+	LastAccess time.Time
+}
+
+func (r *Record) Expired() bool {
+	now := time.Now()
+	return r.Expire.Before(now) || r.LastAccess.Add(time.Hour).Before(now)
+}
+
 type CacheServer struct {
 	sync.RWMutex
 	hosts   map[string]net.IP
diff --git a/app/log/internal/log_entry_test.go b/app/log/internal/log_entry_test.go
index c20b45eb5..c67185a03 100644
--- a/app/log/internal/log_entry_test.go
+++ b/app/log/internal/log_entry_test.go
@@ -4,11 +4,11 @@ import (
 	"testing"
 
 	. "v2ray.com/core/app/log/internal"
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 )
 
 func TestAccessLog(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	entry := &AccessLog{
 		From:   "test_from",
@@ -18,8 +18,8 @@ func TestAccessLog(t *testing.T) {
 	}
 
 	entryStr := entry.String()
-	assert.String(entryStr).Contains("test_from")
-	assert.String(entryStr).Contains("test_to")
-	assert.String(entryStr).Contains("test_reason")
-	assert.String(entryStr).Contains("Accepted")
+	assert(entryStr, HasSubstring, "test_from")
+	assert(entryStr, HasSubstring, "test_to")
+	assert(entryStr, HasSubstring, "test_reason")
+	assert(entryStr, HasSubstring, "Accepted")
 }
diff --git a/app/proxyman/mux/mux_test.go b/app/proxyman/mux/mux_test.go
index 4276fbbfe..775f87f82 100644
--- a/app/proxyman/mux/mux_test.go
+++ b/app/proxyman/mux/mux_test.go
@@ -9,8 +9,8 @@ import (
 	"v2ray.com/core/common/buf"
 	"v2ray.com/core/common/net"
 	"v2ray.com/core/common/protocol"
-	"v2ray.com/core/testing/assert"
 	"v2ray.com/core/transport/ray"
+	. "v2ray.com/ext/assert"
 )
 
 func readAll(reader buf.Reader) (buf.MultiBuffer, error) {
@@ -29,7 +29,7 @@ func readAll(reader buf.Reader) (buf.MultiBuffer, error) {
 }
 
 func TestReaderWriter(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	stream := ray.NewStream(context.Background())
 
@@ -48,16 +48,16 @@ func TestReaderWriter(t *testing.T) {
 		return writer.Write(buf.NewMultiBufferValue(b))
 	}
 
-	assert.Error(writePayload(writer, 'a', 'b', 'c', 'd')).IsNil()
-	assert.Error(writePayload(writer2)).IsNil()
+	assert(writePayload(writer, 'a', 'b', 'c', 'd'), IsNil)
+	assert(writePayload(writer2), IsNil)
 
-	assert.Error(writePayload(writer, 'e', 'f', 'g', 'h')).IsNil()
-	assert.Error(writePayload(writer3, 'x')).IsNil()
+	assert(writePayload(writer, 'e', 'f', 'g', 'h'), IsNil)
+	assert(writePayload(writer3, 'x'), IsNil)
 
 	writer.Close()
 	writer3.Close()
 
-	assert.Error(writePayload(writer2, 'y')).IsNil()
+	assert(writePayload(writer2, 'y'), IsNil)
 	writer2.Close()
 
 	bytesReader := buf.ToBytesReader(stream)
@@ -65,79 +65,79 @@ func TestReaderWriter(t *testing.T) {
 	streamReader := NewStreamReader(bytesReader)
 
 	meta, err := metaReader.Read()
-	assert.Error(err).IsNil()
-	assert.Uint16(meta.SessionID).Equals(1)
-	assert.Byte(byte(meta.SessionStatus)).Equals(byte(SessionStatusNew))
-	assert.Destination(meta.Target).Equals(dest)
-	assert.Byte(byte(meta.Option)).Equals(byte(OptionData))
+	assert(err, IsNil)
+	assert(meta.SessionID, Equals, uint16(1))
+	assert(byte(meta.SessionStatus), Equals, byte(SessionStatusNew))
+	assert(meta.Target, Equals, dest)
+	assert(byte(meta.Option), Equals, byte(OptionData))
 
 	data, err := readAll(streamReader)
-	assert.Error(err).IsNil()
-	assert.Int(len(data)).Equals(1)
-	assert.String(data[0].String()).Equals("abcd")
+	assert(err, IsNil)
+	assert(len(data), Equals, 1)
+	assert(data[0].String(), Equals, "abcd")
 
 	meta, err = metaReader.Read()
-	assert.Error(err).IsNil()
-	assert.Byte(byte(meta.SessionStatus)).Equals(byte(SessionStatusNew))
-	assert.Uint16(meta.SessionID).Equals(2)
-	assert.Byte(byte(meta.Option)).Equals(0)
-	assert.Destination(meta.Target).Equals(dest2)
+	assert(err, IsNil)
+	assert(byte(meta.SessionStatus), Equals, byte(SessionStatusNew))
+	assert(meta.SessionID, Equals, uint16(2))
+	assert(byte(meta.Option), Equals, byte(0))
+	assert(meta.Target, Equals, dest2)
 
 	meta, err = metaReader.Read()
-	assert.Error(err).IsNil()
-	assert.Byte(byte(meta.SessionStatus)).Equals(byte(SessionStatusKeep))
-	assert.Uint16(meta.SessionID).Equals(1)
-	assert.Byte(byte(meta.Option)).Equals(1)
+	assert(err, IsNil)
+	assert(byte(meta.SessionStatus), Equals, byte(SessionStatusKeep))
+	assert(meta.SessionID, Equals, uint16(1))
+	assert(byte(meta.Option), Equals, byte(1))
 
 	data, err = readAll(streamReader)
-	assert.Error(err).IsNil()
-	assert.Int(len(data)).Equals(1)
-	assert.String(data[0].String()).Equals("efgh")
+	assert(err, IsNil)
+	assert(len(data), Equals, 1)
+	assert(data[0].String(), Equals, "efgh")
 
 	meta, err = metaReader.Read()
-	assert.Error(err).IsNil()
-	assert.Byte(byte(meta.SessionStatus)).Equals(byte(SessionStatusNew))
-	assert.Uint16(meta.SessionID).Equals(3)
-	assert.Byte(byte(meta.Option)).Equals(1)
-	assert.Destination(meta.Target).Equals(dest3)
+	assert(err, IsNil)
+	assert(byte(meta.SessionStatus), Equals, byte(SessionStatusNew))
+	assert(meta.SessionID, Equals, uint16(3))
+	assert(byte(meta.Option), Equals, byte(1))
+	assert(meta.Target, Equals, dest3)
 
 	data, err = readAll(streamReader)
-	assert.Error(err).IsNil()
-	assert.Int(len(data)).Equals(1)
-	assert.String(data[0].String()).Equals("x")
+	assert(err, IsNil)
+	assert(len(data), Equals, 1)
+	assert(data[0].String(), Equals, "x")
 
 	meta, err = metaReader.Read()
-	assert.Error(err).IsNil()
-	assert.Byte(byte(meta.SessionStatus)).Equals(byte(SessionStatusEnd))
-	assert.Uint16(meta.SessionID).Equals(1)
-	assert.Byte(byte(meta.Option)).Equals(0)
+	assert(err, IsNil)
+	assert(byte(meta.SessionStatus), Equals, byte(SessionStatusEnd))
+	assert(meta.SessionID, Equals, uint16(1))
+	assert(byte(meta.Option), Equals, byte(0))
 
 	meta, err = metaReader.Read()
-	assert.Error(err).IsNil()
-	assert.Byte(byte(meta.SessionStatus)).Equals(byte(SessionStatusEnd))
-	assert.Uint16(meta.SessionID).Equals(3)
-	assert.Byte(byte(meta.Option)).Equals(0)
+	assert(err, IsNil)
+	assert(byte(meta.SessionStatus), Equals, byte(SessionStatusEnd))
+	assert(meta.SessionID, Equals, uint16(3))
+	assert(byte(meta.Option), Equals, byte(0))
 
 	meta, err = metaReader.Read()
-	assert.Error(err).IsNil()
-	assert.Byte(byte(meta.SessionStatus)).Equals(byte(SessionStatusKeep))
-	assert.Uint16(meta.SessionID).Equals(2)
-	assert.Byte(byte(meta.Option)).Equals(1)
+	assert(err, IsNil)
+	assert(byte(meta.SessionStatus), Equals, byte(SessionStatusKeep))
+	assert(meta.SessionID, Equals, uint16(2))
+	assert(byte(meta.Option), Equals, byte(1))
 
 	data, err = readAll(streamReader)
-	assert.Error(err).IsNil()
-	assert.Int(len(data)).Equals(1)
-	assert.String(data[0].String()).Equals("y")
+	assert(err, IsNil)
+	assert(len(data), Equals, 1)
+	assert(data[0].String(), Equals, "y")
 
 	meta, err = metaReader.Read()
-	assert.Error(err).IsNil()
-	assert.Byte(byte(meta.SessionStatus)).Equals(byte(SessionStatusEnd))
-	assert.Uint16(meta.SessionID).Equals(2)
-	assert.Byte(byte(meta.Option)).Equals(0)
+	assert(err, IsNil)
+	assert(byte(meta.SessionStatus), Equals, byte(SessionStatusEnd))
+	assert(meta.SessionID, Equals, uint16(2))
+	assert(byte(meta.Option), Equals, byte(0))
 
 	stream.Close()
 
 	meta, err = metaReader.Read()
-	assert.Error(err).IsNotNil()
-	assert.Pointer(meta).IsNil()
+	assert(err, IsNotNil)
+	assert(meta, IsNil)
 }
diff --git a/app/proxyman/mux/session_test.go b/app/proxyman/mux/session_test.go
index 63953ecf6..4acffd8f0 100644
--- a/app/proxyman/mux/session_test.go
+++ b/app/proxyman/mux/session_test.go
@@ -4,36 +4,36 @@ import (
 	"testing"
 
 	. "v2ray.com/core/app/proxyman/mux"
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 )
 
 func TestSessionManagerAdd(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	m := NewSessionManager()
 
 	s := m.Allocate()
-	assert.Uint16(s.ID).Equals(1)
-	assert.Int(m.Size()).Equals(1)
+	assert(s.ID, Equals, uint16(1))
+	assert(m.Size(), Equals, 1)
 
 	s = m.Allocate()
-	assert.Uint16(s.ID).Equals(2)
-	assert.Int(m.Size()).Equals(2)
+	assert(s.ID, Equals, uint16(2))
+	assert(m.Size(), Equals, 2)
 
 	s = &Session{
 		ID: 4,
 	}
 	m.Add(s)
-	assert.Uint16(s.ID).Equals(4)
+	assert(s.ID, Equals, uint16(4))
 }
 
 func TestSessionManagerClose(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	m := NewSessionManager()
 	s := m.Allocate()
 
-	assert.Bool(m.CloseIfNoSession()).IsFalse()
+	assert(m.CloseIfNoSession(), IsFalse)
 	m.Remove(s.ID)
-	assert.Bool(m.CloseIfNoSession()).IsTrue()
+	assert(m.CloseIfNoSession(), IsTrue)
 }
diff --git a/app/router/condition_test.go b/app/router/condition_test.go
index 1fec521fe..f0283dc3d 100644
--- a/app/router/condition_test.go
+++ b/app/router/condition_test.go
@@ -8,11 +8,11 @@ import (
 	"v2ray.com/core/common/net"
 	"v2ray.com/core/common/protocol"
 	"v2ray.com/core/proxy"
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 )
 
 func TestSubDomainMatcher(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	cases := []struct {
 		pattern string
@@ -47,12 +47,12 @@ func TestSubDomainMatcher(t *testing.T) {
 	}
 	for _, test := range cases {
 		matcher := NewSubDomainMatcher(test.pattern)
-		assert.Bool(matcher.Apply(test.input) == test.output).IsTrue()
+		assert(matcher.Apply(test.input) == test.output, IsTrue)
 	}
 }
 
 func TestRoutingRule(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	type ruleTest struct {
 		input  context.Context
@@ -172,10 +172,10 @@ func TestRoutingRule(t *testing.T) {
 
 	for _, test := range cases {
 		cond, err := test.rule.BuildCondition()
-		assert.Error(err).IsNil()
+		assert(err, IsNil)
 
 		for _, t := range test.test {
-			assert.Bool(cond.Apply(t.input)).Equals(t.output)
+			assert(cond.Apply(t.input), Equals, t.output)
 		}
 	}
 }
diff --git a/app/router/router_test.go b/app/router/router_test.go
index e3db5cd0e..12350fb94 100644
--- a/app/router/router_test.go
+++ b/app/router/router_test.go
@@ -14,11 +14,11 @@ import (
 	. "v2ray.com/core/app/router"
 	"v2ray.com/core/common/net"
 	"v2ray.com/core/proxy"
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 )
 
 func TestSimpleRouter(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	config := &Config{
 		Rule: []*RoutingRule{
@@ -33,16 +33,16 @@ func TestSimpleRouter(t *testing.T) {
 
 	space := app.NewSpace()
 	ctx := app.ContextWithSpace(context.Background(), space)
-	assert.Error(app.AddApplicationToSpace(ctx, new(dns.Config))).IsNil()
-	assert.Error(app.AddApplicationToSpace(ctx, new(dispatcher.Config))).IsNil()
-	assert.Error(app.AddApplicationToSpace(ctx, new(proxyman.OutboundConfig))).IsNil()
-	assert.Error(app.AddApplicationToSpace(ctx, config)).IsNil()
-	assert.Error(space.Initialize()).IsNil()
+	assert(app.AddApplicationToSpace(ctx, new(dns.Config)), IsNil)
+	assert(app.AddApplicationToSpace(ctx, new(dispatcher.Config)), IsNil)
+	assert(app.AddApplicationToSpace(ctx, new(proxyman.OutboundConfig)), IsNil)
+	assert(app.AddApplicationToSpace(ctx, config), IsNil)
+	assert(space.Initialize(), IsNil)
 
 	r := FromSpace(space)
 
 	ctx = proxy.ContextWithTarget(ctx, net.TCPDestination(net.DomainAddress("v2ray.com"), 80))
 	tag, err := r.TakeDetour(ctx)
-	assert.Error(err).IsNil()
-	assert.String(tag).Equals("test")
+	assert(err, IsNil)
+	assert(tag, Equals, "test")
 }
diff --git a/common/bitmask/byte_test.go b/common/bitmask/byte_test.go
index 6e7e2e8b2..2ca2a7e32 100644
--- a/common/bitmask/byte_test.go
+++ b/common/bitmask/byte_test.go
@@ -4,24 +4,24 @@ import (
 	"testing"
 
 	. "v2ray.com/core/common/bitmask"
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 )
 
 func TestBitmaskByte(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	b := Byte(0)
 	b.Set(Byte(1))
-	assert.Bool(b.Has(1)).IsTrue()
+	assert(b.Has(1), IsTrue)
 
 	b.Set(Byte(2))
-	assert.Bool(b.Has(2)).IsTrue()
-	assert.Bool(b.Has(1)).IsTrue()
+	assert(b.Has(2), IsTrue)
+	assert(b.Has(1), IsTrue)
 
 	b.Clear(Byte(1))
-	assert.Bool(b.Has(2)).IsTrue()
-	assert.Bool(b.Has(1)).IsFalse()
+	assert(b.Has(2), IsTrue)
+	assert(b.Has(1), IsFalse)
 
 	b.Toggle(Byte(2))
-	assert.Bool(b.Has(2)).IsFalse()
+	assert(b.Has(2), IsFalse)
 }
diff --git a/common/buf/buffer_test.go b/common/buf/buffer_test.go
index 6c0d2a50f..af05057ec 100644
--- a/common/buf/buffer_test.go
+++ b/common/buf/buffer_test.go
@@ -6,64 +6,64 @@ import (
 
 	. "v2ray.com/core/common/buf"
 	"v2ray.com/core/common/serial"
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 )
 
 func TestBufferClear(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	buffer := New()
 	defer buffer.Release()
 
 	payload := "Bytes"
 	buffer.Append([]byte(payload))
-	assert.Int(buffer.Len()).Equals(len(payload))
+	assert(buffer.Len(), Equals, len(payload))
 
 	buffer.Clear()
-	assert.Int(buffer.Len()).Equals(0)
+	assert(buffer.Len(), Equals, 0)
 }
 
 func TestBufferIsEmpty(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	buffer := New()
 	defer buffer.Release()
 
-	assert.Bool(buffer.IsEmpty()).IsTrue()
+	assert(buffer.IsEmpty(), IsTrue)
 }
 
 func TestBufferString(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	buffer := New()
 	defer buffer.Release()
 
-	assert.Error(buffer.AppendSupplier(serial.WriteString("Test String"))).IsNil()
-	assert.String(buffer.String()).Equals("Test String")
+	assert(buffer.AppendSupplier(serial.WriteString("Test String")), IsNil)
+	assert(buffer.String(), Equals, "Test String")
 }
 
 func TestBufferWrite(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	buffer := NewLocal(8)
 	nBytes, err := buffer.Write([]byte("abcd"))
-	assert.Error(err).IsNil()
-	assert.Int(nBytes).Equals(4)
+	assert(err, IsNil)
+	assert(nBytes, Equals, 4)
 	nBytes, err = buffer.Write([]byte("abcde"))
-	assert.Error(err).IsNil()
-	assert.Int(nBytes).Equals(4)
-	assert.String(buffer.String()).Equals("abcdabcd")
+	assert(err, IsNil)
+	assert(nBytes, Equals, 4)
+	assert(buffer.String(), Equals, "abcdabcd")
 }
 
 func TestSyncPool(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	p := NewSyncPool(32)
 	b := p.Allocate()
-	assert.Int(b.Len()).Equals(0)
+	assert(b.Len(), Equals, 0)
 
-	assert.Error(b.AppendSupplier(ReadFrom(rand.Reader))).IsNil()
-	assert.Int(b.Len()).Equals(32)
+	assert(b.AppendSupplier(ReadFrom(rand.Reader)), IsNil)
+	assert(b.Len(), Equals, 32)
 
 	b.Release()
 }
diff --git a/common/buf/buffered_reader_test.go b/common/buf/buffered_reader_test.go
index 1c0731535..7d23e4076 100644
--- a/common/buf/buffered_reader_test.go
+++ b/common/buf/buffered_reader_test.go
@@ -5,32 +5,32 @@ import (
 	"testing"
 
 	. "v2ray.com/core/common/buf"
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 )
 
 func TestBufferedReader(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	content := New()
-	assert.Error(content.AppendSupplier(ReadFrom(rand.Reader))).IsNil()
+	assert(content.AppendSupplier(ReadFrom(rand.Reader)), IsNil)
 
 	len := content.Len()
 
 	reader := NewBufferedReader(content)
-	assert.Bool(reader.IsBuffered()).IsTrue()
+	assert(reader.IsBuffered(), IsTrue)
 
 	payload := make([]byte, 16)
 
 	nBytes, err := reader.Read(payload)
-	assert.Int(nBytes).Equals(16)
-	assert.Error(err).IsNil()
+	assert(nBytes, Equals, 16)
+	assert(err, IsNil)
 
 	len2 := content.Len()
-	assert.Int(len - len2).GreaterThan(16)
+	assert(len - len2, GreaterThan, 16)
 
 	nBytes, err = reader.Read(payload)
-	assert.Int(nBytes).Equals(16)
-	assert.Error(err).IsNil()
+	assert(nBytes, Equals, 16)
+	assert(err, IsNil)
 
-	assert.Int(content.Len()).Equals(len2)
+	assert(content.Len(), Equals, len2)
 }
diff --git a/common/buf/buffered_writer_test.go b/common/buf/buffered_writer_test.go
index 97cb923be..12154ee6c 100644
--- a/common/buf/buffered_writer_test.go
+++ b/common/buf/buffered_writer_test.go
@@ -6,49 +6,49 @@ import (
 
 	"v2ray.com/core/common"
 	. "v2ray.com/core/common/buf"
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 )
 
 func TestBufferedWriter(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	content := New()
 
 	writer := NewBufferedWriter(content)
-	assert.Bool(writer.IsBuffered()).IsTrue()
+	assert(writer.IsBuffered(), IsTrue)
 
 	payload := make([]byte, 16)
 
 	nBytes, err := writer.Write(payload)
-	assert.Int(nBytes).Equals(16)
-	assert.Error(err).IsNil()
+	assert(nBytes, Equals, 16)
+	assert(err, IsNil)
 
-	assert.Bool(content.IsEmpty()).IsTrue()
+	assert(content.IsEmpty(), IsTrue)
 
-	assert.Error(writer.SetBuffered(false)).IsNil()
-	assert.Int(content.Len()).Equals(16)
+	assert(writer.SetBuffered(false), IsNil)
+	assert(content.Len(), Equals, 16)
 }
 
 func TestBufferedWriterLargePayload(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	content := NewLocal(128 * 1024)
 
 	writer := NewBufferedWriter(content)
-	assert.Bool(writer.IsBuffered()).IsTrue()
+	assert(writer.IsBuffered(), IsTrue)
 
 	payload := make([]byte, 64*1024)
 	common.Must2(rand.Read(payload))
 
 	nBytes, err := writer.Write(payload[:512])
-	assert.Int(nBytes).Equals(512)
-	assert.Error(err).IsNil()
+	assert(nBytes, Equals, 512)
+	assert(err, IsNil)
 
-	assert.Bool(content.IsEmpty()).IsTrue()
+	assert(content.IsEmpty(), IsTrue)
 
 	nBytes, err = writer.Write(payload[512:])
-	assert.Error(err).IsNil()
-	assert.Error(writer.Flush()).IsNil()
-	assert.Int(nBytes).Equals(64*1024 - 512)
-	assert.Bytes(content.Bytes()).Equals(payload)
+	assert(err, IsNil)
+	assert(writer.Flush(), IsNil)
+	assert(nBytes, Equals, 64*1024 - 512)
+	assert(content.Bytes(), Equals, payload)
 }
diff --git a/common/buf/multi_buffer_test.go b/common/buf/multi_buffer_test.go
index bf7059d44..92df32f02 100644
--- a/common/buf/multi_buffer_test.go
+++ b/common/buf/multi_buffer_test.go
@@ -4,11 +4,11 @@ import (
 	"testing"
 
 	. "v2ray.com/core/common/buf"
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 )
 
 func TestMultiBufferRead(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	b1 := New()
 	b1.AppendBytes('a', 'b')
@@ -19,17 +19,17 @@ func TestMultiBufferRead(t *testing.T) {
 
 	bs := make([]byte, 32)
 	nBytes, err := mb.Read(bs)
-	assert.Error(err).IsNil()
-	assert.Int(nBytes).Equals(4)
-	assert.Bytes(bs[:nBytes]).Equals([]byte("abcd"))
+	assert(err, IsNil)
+	assert(nBytes, Equals, 4)
+	assert(bs[:nBytes], Equals, []byte("abcd"))
 }
 
 func TestMultiBufferAppend(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	var mb MultiBuffer
 	b := New()
 	b.AppendBytes('a', 'b')
 	mb.Append(b)
-	assert.Int(mb.Len()).Equals(2)
+	assert(mb.Len(), Equals, 2)
 }
diff --git a/common/buf/reader_test.go b/common/buf/reader_test.go
index cb1e6567f..7c79d0fdc 100644
--- a/common/buf/reader_test.go
+++ b/common/buf/reader_test.go
@@ -7,24 +7,24 @@ import (
 	"testing"
 
 	. "v2ray.com/core/common/buf"
-	"v2ray.com/core/testing/assert"
 	"v2ray.com/core/transport/ray"
+	. "v2ray.com/ext/assert"
 )
 
 func TestAdaptiveReader(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	rawContent := make([]byte, 1024*1024)
 	buffer := bytes.NewBuffer(rawContent)
 
 	reader := NewReader(buffer)
 	b, err := reader.Read()
-	assert.Error(err).IsNil()
-	assert.Int(b.Len()).Equals(32 * 1024)
+	assert(err, IsNil)
+	assert(b.Len(), Equals, 32*1024)
 }
 
 func TestBytesReaderWriteTo(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	stream := ray.NewStream(context.Background())
 	reader := ToBytesReader(stream)
@@ -32,25 +32,25 @@ func TestBytesReaderWriteTo(t *testing.T) {
 	b1.AppendBytes('a', 'b', 'c')
 	b2 := New()
 	b2.AppendBytes('e', 'f', 'g')
-	assert.Error(stream.Write(NewMultiBufferValue(b1, b2))).IsNil()
+	assert(stream.Write(NewMultiBufferValue(b1, b2)), IsNil)
 	stream.Close()
 
 	stream2 := ray.NewStream(context.Background())
 	writer := ToBytesWriter(stream2)
 
 	nBytes, err := io.Copy(writer, reader)
-	assert.Error(err).IsNil()
-	assert.Int64(nBytes).Equals(6)
+	assert(err, IsNil)
+	assert(nBytes, Equals, int64(6))
 
 	mb, err := stream2.Read()
-	assert.Error(err).IsNil()
-	assert.Int(len(mb)).Equals(2)
-	assert.String(mb[0].String()).Equals("abc")
-	assert.String(mb[1].String()).Equals("efg")
+	assert(err, IsNil)
+	assert(len(mb), Equals, 2)
+	assert(mb[0].String(), Equals, "abc")
+	assert(mb[1].String(), Equals, "efg")
 }
 
 func TestBytesReaderMultiBuffer(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	stream := ray.NewStream(context.Background())
 	reader := ToBytesReader(stream)
@@ -58,13 +58,13 @@ func TestBytesReaderMultiBuffer(t *testing.T) {
 	b1.AppendBytes('a', 'b', 'c')
 	b2 := New()
 	b2.AppendBytes('e', 'f', 'g')
-	assert.Error(stream.Write(NewMultiBufferValue(b1, b2))).IsNil()
+	assert(stream.Write(NewMultiBufferValue(b1, b2)), IsNil)
 	stream.Close()
 
 	mbReader := NewReader(reader)
 	mb, err := mbReader.Read()
-	assert.Error(err).IsNil()
-	assert.Int(len(mb)).Equals(2)
-	assert.String(mb[0].String()).Equals("abc")
-	assert.String(mb[1].String()).Equals("efg")
+	assert(err, IsNil)
+	assert(len(mb), Equals, 2)
+	assert(mb[0].String(), Equals, "abc")
+	assert(mb[1].String(), Equals, "efg")
 }
diff --git a/common/buf/writer_test.go b/common/buf/writer_test.go
index afa0d8cd2..b91006904 100644
--- a/common/buf/writer_test.go
+++ b/common/buf/writer_test.go
@@ -10,15 +10,15 @@ import (
 	"io"
 
 	. "v2ray.com/core/common/buf"
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 	"v2ray.com/core/transport/ray"
 )
 
 func TestWriter(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	lb := New()
-	assert.Error(lb.AppendSupplier(ReadFrom(rand.Reader))).IsNil()
+	assert(lb.AppendSupplier(ReadFrom(rand.Reader)), IsNil)
 
 	expectedBytes := append([]byte(nil), lb.Bytes()...)
 
@@ -26,20 +26,20 @@ func TestWriter(t *testing.T) {
 
 	writer := NewWriter(NewBufferedWriter(writeBuffer))
 	err := writer.Write(NewMultiBufferValue(lb))
-	assert.Error(err).IsNil()
-	assert.Bytes(expectedBytes).Equals(writeBuffer.Bytes())
+	assert(err, IsNil)
+	assert(expectedBytes, Equals, writeBuffer.Bytes())
 }
 
 func TestBytesWriterReadFrom(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	cache := ray.NewStream(context.Background())
 	reader := bufio.NewReader(io.LimitReader(rand.Reader, 8192))
 	_, err := reader.WriteTo(ToBytesWriter(cache))
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	mb, err := cache.Read()
-	assert.Error(err).IsNil()
-	assert.Int(mb.Len()).Equals(8192)
-	assert.Int(len(mb)).Equals(4)
+	assert(err, IsNil)
+	assert(mb.Len(), Equals, 8192)
+	assert(len(mb), Equals, 4)
 }
diff --git a/common/crypto/auth_test.go b/common/crypto/auth_test.go
index a44ecfbf3..cd10b1b63 100644
--- a/common/crypto/auth_test.go
+++ b/common/crypto/auth_test.go
@@ -10,19 +10,19 @@ import (
 	"v2ray.com/core/common/buf"
 	. "v2ray.com/core/common/crypto"
 	"v2ray.com/core/common/protocol"
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 )
 
 func TestAuthenticationReaderWriter(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	key := make([]byte, 16)
 	rand.Read(key)
 	block, err := aes.NewCipher(key)
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	aead, err := cipher.NewGCM(block)
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	rawPayload := make([]byte, 8192*10)
 	rand.Read(rawPayload)
@@ -42,10 +42,10 @@ func TestAuthenticationReaderWriter(t *testing.T) {
 		AdditionalDataGenerator: &NoOpBytesGenerator{},
 	}, PlainChunkSizeParser{}, cache, protocol.TransferTypeStream)
 
-	assert.Error(writer.Write(buf.NewMultiBufferValue(payload))).IsNil()
-	assert.Int(cache.Len()).Equals(83360)
-	assert.Error(writer.Write(buf.NewMultiBuffer())).IsNil()
-	assert.Error(err).IsNil()
+	assert(writer.Write(buf.NewMultiBufferValue(payload)), IsNil)
+	assert(cache.Len(), Equals, 83360)
+	assert(writer.Write(buf.NewMultiBuffer()), IsNil)
+	assert(err, IsNil)
 
 	reader := NewAuthenticationReader(&AEADAuthenticator{
 		AEAD: aead,
@@ -59,29 +59,29 @@ func TestAuthenticationReaderWriter(t *testing.T) {
 
 	for mb.Len() < len(rawPayload) {
 		mb2, err := reader.Read()
-		assert.Error(err).IsNil()
+		assert(err, IsNil)
 
 		mb.AppendMulti(mb2)
 	}
 
 	mbContent := make([]byte, 8192*10)
 	mb.Read(mbContent)
-	assert.Bytes(mbContent).Equals(rawPayload)
+	assert(mbContent, Equals, rawPayload)
 
 	_, err = reader.Read()
-	assert.Error(err).Equals(io.EOF)
+	assert(err, Equals, io.EOF)
 }
 
 func TestAuthenticationReaderWriterPacket(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	key := make([]byte, 16)
 	rand.Read(key)
 	block, err := aes.NewCipher(key)
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	aead, err := cipher.NewGCM(block)
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	cache := buf.NewLocal(1024)
 	iv := make([]byte, 12)
@@ -104,10 +104,10 @@ func TestAuthenticationReaderWriterPacket(t *testing.T) {
 	pb2.Append([]byte("efgh"))
 	payload.Append(pb2)
 
-	assert.Error(writer.Write(payload)).IsNil()
-	assert.Int(cache.Len()).GreaterThan(0)
-	assert.Error(writer.Write(buf.NewMultiBuffer())).IsNil()
-	assert.Error(err).IsNil()
+	assert(writer.Write(payload), IsNil)
+	assert(cache.Len(), GreaterThan, 0)
+	assert(writer.Write(buf.NewMultiBuffer()), IsNil)
+	assert(err, IsNil)
 
 	reader := NewAuthenticationReader(&AEADAuthenticator{
 		AEAD: aead,
@@ -118,14 +118,14 @@ func TestAuthenticationReaderWriterPacket(t *testing.T) {
 	}, PlainChunkSizeParser{}, cache, protocol.TransferTypePacket)
 
 	mb, err := reader.Read()
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	b1 := mb.SplitFirst()
-	assert.String(b1.String()).Equals("abcd")
+	assert(b1.String(), Equals, "abcd")
 	b2 := mb.SplitFirst()
-	assert.String(b2.String()).Equals("efgh")
-	assert.Bool(mb.IsEmpty()).IsTrue()
+	assert(b2.String(), Equals, "efgh")
+	assert(mb.IsEmpty(), IsTrue)
 
 	_, err = reader.Read()
-	assert.Error(err).Equals(io.EOF)
+	assert(err, Equals, io.EOF)
 }
diff --git a/common/crypto/chacha20_test.go b/common/crypto/chacha20_test.go
index 7bca32a91..40ea44c3b 100644
--- a/common/crypto/chacha20_test.go
+++ b/common/crypto/chacha20_test.go
@@ -7,7 +7,7 @@ import (
 
 	"v2ray.com/core/common"
 	. "v2ray.com/core/common/crypto"
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 )
 
 func mustDecodeHex(s string) []byte {
@@ -17,7 +17,7 @@ func mustDecodeHex(s string) []byte {
 }
 
 func TestChaCha20Stream(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	var cases = []struct {
 		key    []byte
@@ -51,12 +51,12 @@ func TestChaCha20Stream(t *testing.T) {
 		input := make([]byte, len(c.output))
 		actualOutout := make([]byte, len(c.output))
 		s.XORKeyStream(actualOutout, input)
-		assert.Bytes(c.output).Equals(actualOutout)
+		assert(c.output, Equals, actualOutout)
 	}
 }
 
 func TestChaCha20Decoding(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	key := make([]byte, 32)
 	rand.Read(key)
@@ -72,5 +72,5 @@ func TestChaCha20Decoding(t *testing.T) {
 
 	stream2 := NewChaCha20Stream(key, iv)
 	stream2.XORKeyStream(x, x)
-	assert.Bytes(x).Equals(payload)
+	assert(x, Equals, payload)
 }
diff --git a/common/crypto/chunk_test.go b/common/crypto/chunk_test.go
index e9f399b0f..67144dcef 100644
--- a/common/crypto/chunk_test.go
+++ b/common/crypto/chunk_test.go
@@ -6,11 +6,11 @@ import (
 
 	"v2ray.com/core/common/buf"
 	. "v2ray.com/core/common/crypto"
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 )
 
 func TestChunkStreamIO(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	cache := buf.NewLocal(8192)
 
@@ -19,26 +19,26 @@ func TestChunkStreamIO(t *testing.T) {
 
 	b := buf.New()
 	b.AppendBytes('a', 'b', 'c', 'd')
-	assert.Error(writer.Write(buf.NewMultiBufferValue(b))).IsNil()
+	assert(writer.Write(buf.NewMultiBufferValue(b)), IsNil)
 
 	b = buf.New()
 	b.AppendBytes('e', 'f', 'g')
-	assert.Error(writer.Write(buf.NewMultiBufferValue(b))).IsNil()
+	assert(writer.Write(buf.NewMultiBufferValue(b)), IsNil)
 
-	assert.Error(writer.Write(buf.NewMultiBuffer())).IsNil()
+	assert(writer.Write(buf.NewMultiBuffer()), IsNil)
 
-	assert.Int(cache.Len()).Equals(13)
+	assert(cache.Len(), Equals, 13)
 
 	mb, err := reader.Read()
-	assert.Error(err).IsNil()
-	assert.Int(mb.Len()).Equals(4)
-	assert.Bytes(mb[0].Bytes()).Equals([]byte("abcd"))
+	assert(err, IsNil)
+	assert(mb.Len(), Equals, 4)
+	assert(mb[0].Bytes(), Equals, []byte("abcd"))
 
 	mb, err = reader.Read()
-	assert.Error(err).IsNil()
-	assert.Int(mb.Len()).Equals(3)
-	assert.Bytes(mb[0].Bytes()).Equals([]byte("efg"))
+	assert(err, IsNil)
+	assert(mb.Len(), Equals, 3)
+	assert(mb[0].Bytes(), Equals, []byte("efg"))
 
 	_, err = reader.Read()
-	assert.Error(err).Equals(io.EOF)
+	assert(err, Equals, io.EOF)
 }
diff --git a/common/errors/errors_test.go b/common/errors/errors_test.go
index cb385fbd9..337e3c9d2 100644
--- a/common/errors/errors_test.go
+++ b/common/errors/errors_test.go
@@ -5,29 +5,29 @@ import (
 	"testing"
 
 	. "v2ray.com/core/common/errors"
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 )
 
 func TestError(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	err := New("TestError")
-	assert.Bool(GetSeverity(err) == SeverityInfo).IsTrue()
+	assert(GetSeverity(err), Equals, SeverityInfo)
 
 	err = New("TestError2").Base(io.EOF)
-	assert.Bool(GetSeverity(err) == SeverityInfo).IsTrue()
+	assert(GetSeverity(err), Equals, SeverityInfo)
 
 	err = New("TestError3").Base(io.EOF).AtWarning()
-	assert.Bool(GetSeverity(err) == SeverityWarning).IsTrue()
+	assert(GetSeverity(err), Equals, SeverityWarning)
 
 	err = New("TestError4").Base(io.EOF).AtWarning()
 	err = New("TestError5").Base(err)
-	assert.Bool(GetSeverity(err) == SeverityWarning).IsTrue()
-	assert.String(err.Error()).Contains("EOF")
+	assert(GetSeverity(err), Equals, SeverityWarning)
+	assert(err.Error(), HasSubstring, "EOF")
 }
 
 func TestErrorMessage(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	data := []struct {
 		err error
@@ -44,6 +44,6 @@ func TestErrorMessage(t *testing.T) {
 	}
 
 	for _, d := range data {
-		assert.String(d.err.Error()).Equals(d.msg)
+		assert(d.err.Error(), Equals, d.msg)
 	}
 }
diff --git a/common/net/address_test.go b/common/net/address_test.go
index 58583d248..3f5fcb428 100644
--- a/common/net/address_test.go
+++ b/common/net/address_test.go
@@ -6,7 +6,6 @@ import (
 
 	. "v2ray.com/core/common/net"
 	. "v2ray.com/core/common/net/testing"
-	"v2ray.com/core/testing/assert"
 	. "v2ray.com/ext/assert"
 )
 
@@ -24,7 +23,7 @@ func TestIPv4Address(t *testing.T) {
 }
 
 func TestIPv6Address(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	ip := []byte{
 		byte(1), byte(2), byte(3), byte(4),
@@ -34,15 +33,15 @@ func TestIPv6Address(t *testing.T) {
 	}
 	addr := IPAddress(ip)
 
-	assert.Address(addr).IsIPv6()
-	assert.Address(addr).IsNotIPv4()
-	assert.Address(addr).IsNotDomain()
-	assert.IP(addr.IP()).Equals(net.IP(ip))
-	assert.Address(addr).EqualsString("[102:304:102:304:102:304:102:304]")
+	assert(addr, IsIPv6)
+	assert(addr, Not(IsIPv4))
+	assert(addr, Not(IsDomain))
+	assert(addr.IP(), Equals, net.IP(ip))
+	assert(addr.String(), Equals, "[102:304:102:304:102:304:102:304]")
 }
 
 func TestIPv4Asv6(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 	ip := []byte{
 		byte(0), byte(0), byte(0), byte(0),
 		byte(0), byte(0), byte(0), byte(0),
@@ -50,27 +49,27 @@ func TestIPv4Asv6(t *testing.T) {
 		byte(1), byte(2), byte(3), byte(4),
 	}
 	addr := IPAddress(ip)
-	assert.Address(addr).EqualsString("1.2.3.4")
+	assert(addr.String(), Equals, "1.2.3.4")
 }
 
 func TestDomainAddress(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	domain := "v2ray.com"
 	addr := DomainAddress(domain)
 
-	assert.Address(addr).IsDomain()
-	assert.Address(addr).IsNotIPv6()
-	assert.Address(addr).IsNotIPv4()
-	assert.String(addr.Domain()).Equals(domain)
-	assert.Address(addr).EqualsString("v2ray.com")
+	assert(addr, IsDomain)
+	assert(addr, Not(IsIPv6))
+	assert(addr, Not(IsIPv4))
+	assert(addr.Domain(), Equals, domain)
+	assert(addr.String(), Equals, "v2ray.com")
 }
 
 func TestNetIPv4Address(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	ip := net.IPv4(1, 2, 3, 4)
 	addr := IPAddress(ip)
-	assert.Address(addr).IsIPv4()
-	assert.Address(addr).EqualsString("1.2.3.4")
+	assert(addr, IsIPv4)
+	assert(addr.String(), Equals, "1.2.3.4")
 }
diff --git a/common/net/destination_test.go b/common/net/destination_test.go
index f3b0f1317..b68e9ccbe 100644
--- a/common/net/destination_test.go
+++ b/common/net/destination_test.go
@@ -4,23 +4,24 @@ import (
 	"testing"
 
 	. "v2ray.com/core/common/net"
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/core/common/net/testing"
+	. "v2ray.com/ext/assert"
 )
 
 func TestTCPDestination(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	dest := TCPDestination(IPAddress([]byte{1, 2, 3, 4}), 80)
-	assert.Destination(dest).IsTCP()
-	assert.Destination(dest).IsNotUDP()
-	assert.Destination(dest).EqualsString("tcp:1.2.3.4:80")
+	assert(dest, IsTCP)
+	assert(dest, Not(IsUDP))
+	assert(dest.String(), Equals, "tcp:1.2.3.4:80")
 }
 
 func TestUDPDestination(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	dest := UDPDestination(IPAddress([]byte{0x20, 0x01, 0x48, 0x60, 0x48, 0x60, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x88, 0x88}), 53)
-	assert.Destination(dest).IsNotTCP()
-	assert.Destination(dest).IsUDP()
-	assert.Destination(dest).EqualsString("udp:[2001:4860:4860::8888]:53")
+	assert(dest, Not(IsTCP))
+	assert(dest, IsUDP)
+	assert(dest.String(), Equals, "udp:[2001:4860:4860::8888]:53")
 }
diff --git a/common/net/ipnet_test.go b/common/net/ipnet_test.go
index e92616037..132dca9b7 100644
--- a/common/net/ipnet_test.go
+++ b/common/net/ipnet_test.go
@@ -6,7 +6,7 @@ import (
 
 	"v2ray.com/core/common"
 	. "v2ray.com/core/common/net"
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 )
 
 func parseCIDR(str string) *net.IPNet {
@@ -16,7 +16,7 @@ func parseCIDR(str string) *net.IPNet {
 }
 
 func TestIPNet(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	ipNet := NewIPNetTable()
 	ipNet.Add(parseCIDR(("0.0.0.0/8")))
@@ -32,12 +32,12 @@ func TestIPNet(t *testing.T) {
 	ipNet.Add(parseCIDR(("198.51.100.0/24")))
 	ipNet.Add(parseCIDR(("203.0.113.0/24")))
 	ipNet.Add(parseCIDR(("8.8.8.8/32")))
-	assert.Bool(ipNet.Contains(ParseIP("192.168.1.1"))).IsTrue()
-	assert.Bool(ipNet.Contains(ParseIP("192.0.0.0"))).IsTrue()
-	assert.Bool(ipNet.Contains(ParseIP("192.0.1.0"))).IsFalse()
-	assert.Bool(ipNet.Contains(ParseIP("0.1.0.0"))).IsTrue()
-	assert.Bool(ipNet.Contains(ParseIP("1.0.0.1"))).IsFalse()
-	assert.Bool(ipNet.Contains(ParseIP("8.8.8.7"))).IsFalse()
-	assert.Bool(ipNet.Contains(ParseIP("8.8.8.8"))).IsTrue()
-	assert.Bool(ipNet.Contains(ParseIP("2001:cdba::3257:9652"))).IsFalse()
+	assert(ipNet.Contains(ParseIP("192.168.1.1")), IsTrue)
+	assert(ipNet.Contains(ParseIP("192.0.0.0")), IsTrue)
+	assert(ipNet.Contains(ParseIP("192.0.1.0")), IsFalse)
+	assert(ipNet.Contains(ParseIP("0.1.0.0")), IsTrue)
+	assert(ipNet.Contains(ParseIP("1.0.0.1")), IsFalse)
+	assert(ipNet.Contains(ParseIP("8.8.8.7")), IsFalse)
+	assert(ipNet.Contains(ParseIP("8.8.8.8")), IsTrue)
+	assert(ipNet.Contains(ParseIP("2001:cdba::3257:9652")), IsFalse)
 }
diff --git a/common/net/port_test.go b/common/net/port_test.go
index a1f1f4e21..187cdf1f3 100644
--- a/common/net/port_test.go
+++ b/common/net/port_test.go
@@ -4,15 +4,15 @@ import (
 	"testing"
 
 	. "v2ray.com/core/common/net"
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 )
 
 func TestPortRangeContains(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	portRange := &PortRange{
 		From: 53,
 		To:   53,
 	}
-	assert.Bool(portRange.Contains(Port(53))).IsTrue()
+	assert(portRange.Contains(Port(53)), IsTrue)
 }
diff --git a/common/net/testing/assert.go b/common/net/testing/assert.go
index 16c9f5aa7..b6eb2fb9c 100644
--- a/common/net/testing/assert.go
+++ b/common/net/testing/assert.go
@@ -1,46 +1,48 @@
 package testing
 
 import (
-	"reflect"
-
 	"v2ray.com/core/common/net"
 	"v2ray.com/ext/assert"
 )
 
-var IsIPv4 = assert.CreateMatcher(reflect.TypeOf(net.Address(nil)), reflect.ValueOf(func(a net.Address) bool {
+var IsIPv4 = assert.CreateMatcher(func(a net.Address) bool {
 	return a.Family().IsIPv4()
-}), 1, "is IPv4")
+}, "is IPv4")
 
-var IsIPv6 = assert.CreateMatcher(reflect.TypeOf(net.Address(nil)), reflect.ValueOf(func(a net.Address) bool {
+var IsIPv6 = assert.CreateMatcher(func(a net.Address) bool {
 	return a.Family().IsIPv6()
-}), 1, "is IPv6")
+}, "is IPv6")
 
-var IsIP = assert.CreateMatcher(reflect.TypeOf(net.Address(nil)), reflect.ValueOf(func(a net.Address) bool {
+var IsIP = assert.CreateMatcher(func(a net.Address) bool {
 	return a.Family().IsIPv4() || a.Family().IsIPv6()
-}), 1, "is IP")
+}, "is IP")
 
-var IsTCP = assert.CreateMatcher(reflect.TypeOf(net.Destination{}), reflect.ValueOf(func(a net.Destination) bool {
+var IsTCP = assert.CreateMatcher(func(a net.Destination) bool {
 	return a.Network == net.Network_TCP
-}), 1, "is TCP")
+}, "is TCP")
 
-var IsUDP = assert.CreateMatcher(reflect.TypeOf(net.Destination{}), reflect.ValueOf(func(a net.Destination) bool {
+var IsUDP = assert.CreateMatcher(func(a net.Destination) bool {
 	return a.Network == net.Network_UDP
-}), 1, "is UDP")
+}, "is UDP")
 
-var IsDomain = assert.CreateMatcher(reflect.TypeOf(net.Address(nil)), reflect.ValueOf(func(a net.Address) bool {
+var IsDomain = assert.CreateMatcher(func(a net.Address) bool {
 	return a.Family().IsDomain()
-}), 1, "is Domain")
+}, "is Domain")
 
 func init() {
-	assert.RegisterEqualsMatcher(reflect.TypeOf((*net.Address)(nil)).Elem(), reflect.ValueOf(func(a, b net.Address) bool {
+	assert.RegisterEqualsMatcher(func(a, b net.Address) bool {
 		return a == b
-	}))
+	})
 
-	assert.RegisterEqualsMatcher(reflect.TypeOf(net.Destination{}), reflect.ValueOf(func(a, b net.Destination) bool {
+	assert.RegisterEqualsMatcher(func(a, b net.Destination) bool {
 		return a == b
-	}))
+	})
 
-	assert.RegisterEqualsMatcher(reflect.TypeOf(net.Port(0)), reflect.ValueOf(func(a, b net.Port) bool {
+	assert.RegisterEqualsMatcher(func(a, b net.Port) bool {
 		return a == b
-	}))
+	})
+
+	assert.RegisterEqualsMatcher(func(a, b net.IP) bool {
+		return a.Equal(b)
+	})
 }
diff --git a/common/platform/platform_test.go b/common/platform/platform_test.go
index 4b3d6e6fe..6eb52acd6 100644
--- a/common/platform/platform_test.go
+++ b/common/platform/platform_test.go
@@ -4,11 +4,11 @@ import (
 	"testing"
 
 	. "v2ray.com/core/common/platform"
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 )
 
 func TestNormalizeEnvName(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	cases := []struct {
 		input  string
@@ -28,14 +28,14 @@ func TestNormalizeEnvName(t *testing.T) {
 		},
 	}
 	for _, test := range cases {
-		assert.String(NormalizeEnvName(test.input)).Equals(test.output)
+		assert(NormalizeEnvName(test.input), Equals, test.output)
 	}
 }
 
 func TestEnvFlag(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
-	assert.Int(EnvFlag{
+	assert(EnvFlag{
 		Name: "xxxxx.y",
-	}.GetValueAsInt(10)).Equals(10)
+	}.GetValueAsInt(10), Equals, 10)
 }
diff --git a/common/protocol/id_test.go b/common/protocol/id_test.go
index 12788529a..81bf50638 100644
--- a/common/protocol/id_test.go
+++ b/common/protocol/id_test.go
@@ -6,12 +6,12 @@ import (
 	"v2ray.com/core/common/predicate"
 	. "v2ray.com/core/common/protocol"
 	"v2ray.com/core/common/uuid"
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 )
 
 func TestCmdKey(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	id := NewID(uuid.New())
-	assert.Bool(predicate.BytesAll(id.CmdKey(), 0)).IsFalse()
+	assert(predicate.BytesAll(id.CmdKey(), 0), IsFalse)
 }
diff --git a/common/protocol/server_picker_test.go b/common/protocol/server_picker_test.go
index 2b1bd6fe5..72e789ee8 100644
--- a/common/protocol/server_picker_test.go
+++ b/common/protocol/server_picker_test.go
@@ -6,30 +6,30 @@ import (
 
 	"v2ray.com/core/common/net"
 	. "v2ray.com/core/common/protocol"
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 )
 
 func TestServerList(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	list := NewServerList()
 	list.AddServer(NewServerSpec(net.TCPDestination(net.LocalHostIP, net.Port(1)), AlwaysValid()))
-	assert.Uint32(list.Size()).Equals(1)
+	assert(list.Size(), Equals, uint32(1))
 	list.AddServer(NewServerSpec(net.TCPDestination(net.LocalHostIP, net.Port(2)), BeforeTime(time.Now().Add(time.Second))))
-	assert.Uint32(list.Size()).Equals(2)
+	assert(list.Size(), Equals, uint32(2))
 
 	server := list.GetServer(1)
-	assert.Port(server.Destination().Port).Equals(2)
+	assert(server.Destination().Port, Equals, net.Port(2))
 	time.Sleep(2 * time.Second)
 	server = list.GetServer(1)
-	assert.Pointer(server).IsNil()
+	assert(server, IsNil)
 
 	server = list.GetServer(0)
-	assert.Port(server.Destination().Port).Equals(1)
+	assert(server.Destination().Port, Equals, net.Port(1))
 }
 
 func TestServerPicker(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	list := NewServerList()
 	list.AddServer(NewServerSpec(net.TCPDestination(net.LocalHostIP, net.Port(1)), AlwaysValid()))
@@ -38,17 +38,17 @@ func TestServerPicker(t *testing.T) {
 
 	picker := NewRoundRobinServerPicker(list)
 	server := picker.PickServer()
-	assert.Port(server.Destination().Port).Equals(1)
+	assert(server.Destination().Port, Equals, net.Port(1))
 	server = picker.PickServer()
-	assert.Port(server.Destination().Port).Equals(2)
+	assert(server.Destination().Port, Equals, net.Port(2))
 	server = picker.PickServer()
-	assert.Port(server.Destination().Port).Equals(3)
+	assert(server.Destination().Port, Equals, net.Port(3))
 	server = picker.PickServer()
-	assert.Port(server.Destination().Port).Equals(1)
+	assert(server.Destination().Port, Equals, net.Port(1))
 
 	time.Sleep(2 * time.Second)
 	server = picker.PickServer()
-	assert.Port(server.Destination().Port).Equals(1)
+	assert(server.Destination().Port, Equals, net.Port(1))
 	server = picker.PickServer()
-	assert.Port(server.Destination().Port).Equals(1)
+	assert(server.Destination().Port, Equals, net.Port(1))
 }
diff --git a/common/protocol/server_spec_test.go b/common/protocol/server_spec_test.go
index beca89b9c..0c1a6252b 100644
--- a/common/protocol/server_spec_test.go
+++ b/common/protocol/server_spec_test.go
@@ -5,27 +5,27 @@ import (
 	"time"
 
 	. "v2ray.com/core/common/protocol"
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 )
 
 func TestAlwaysValidStrategy(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	strategy := AlwaysValid()
-	assert.Bool(strategy.IsValid()).IsTrue()
+	assert(strategy.IsValid(), IsTrue)
 	strategy.Invalidate()
-	assert.Bool(strategy.IsValid()).IsTrue()
+	assert(strategy.IsValid(), IsTrue)
 }
 
 func TestTimeoutValidStrategy(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	strategy := BeforeTime(time.Now().Add(2 * time.Second))
-	assert.Bool(strategy.IsValid()).IsTrue()
+	assert(strategy.IsValid(), IsTrue)
 	time.Sleep(3 * time.Second)
-	assert.Bool(strategy.IsValid()).IsFalse()
+	assert(strategy.IsValid(), IsFalse)
 
 	strategy = BeforeTime(time.Now().Add(2 * time.Second))
 	strategy.Invalidate()
-	assert.Bool(strategy.IsValid()).IsFalse()
+	assert(strategy.IsValid(), IsFalse)
 }
diff --git a/common/protocol/time_test.go b/common/protocol/time_test.go
index 1ee1084f9..8ed761e53 100644
--- a/common/protocol/time_test.go
+++ b/common/protocol/time_test.go
@@ -5,11 +5,11 @@ import (
 	"time"
 
 	. "v2ray.com/core/common/protocol"
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 )
 
 func TestGenerateRandomInt64InRange(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	base := time.Now().Unix()
 	delta := 100
@@ -17,7 +17,7 @@ func TestGenerateRandomInt64InRange(t *testing.T) {
 
 	for i := 0; i < 100; i++ {
 		val := int64(generator())
-		assert.Int64(val).AtMost(base + int64(delta))
-		assert.Int64(val).AtLeast(base - int64(delta))
+		assert(val, AtMost, base + int64(delta))
+		assert(val, AtLeast, base - int64(delta))
 	}
 }
diff --git a/common/retry/retry_test.go b/common/retry/retry_test.go
index 23dd249ee..a08ec8411 100644
--- a/common/retry/retry_test.go
+++ b/common/retry/retry_test.go
@@ -6,7 +6,7 @@ import (
 
 	"v2ray.com/core/common/errors"
 	. "v2ray.com/core/common/retry"
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 )
 
 var (
@@ -14,7 +14,7 @@ var (
 )
 
 func TestNoRetry(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	startTime := time.Now().Unix()
 	err := Timed(10, 100000).On(func() error {
@@ -22,12 +22,12 @@ func TestNoRetry(t *testing.T) {
 	})
 	endTime := time.Now().Unix()
 
-	assert.Error(err).IsNil()
-	assert.Int64(endTime - startTime).AtLeast(0)
+	assert(err, IsNil)
+	assert(endTime-startTime, AtLeast, int64(0))
 }
 
 func TestRetryOnce(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	startTime := time.Now()
 	called := 0
@@ -40,12 +40,12 @@ func TestRetryOnce(t *testing.T) {
 	})
 	duration := time.Since(startTime)
 
-	assert.Error(err).IsNil()
-	assert.Int64(int64(duration / time.Millisecond)).AtLeast(900)
+	assert(err, IsNil)
+	assert(int64(duration/time.Millisecond), AtLeast, int64(900))
 }
 
 func TestRetryMultiple(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	startTime := time.Now()
 	called := 0
@@ -58,12 +58,12 @@ func TestRetryMultiple(t *testing.T) {
 	})
 	duration := time.Since(startTime)
 
-	assert.Error(err).IsNil()
-	assert.Int64(int64(duration / time.Millisecond)).AtLeast(4900)
+	assert(err, IsNil)
+	assert(int64(duration/time.Millisecond), AtLeast, int64(4900))
 }
 
 func TestRetryExhausted(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	startTime := time.Now()
 	called := 0
@@ -73,12 +73,12 @@ func TestRetryExhausted(t *testing.T) {
 	})
 	duration := time.Since(startTime)
 
-	assert.Error(errors.Cause(err)).Equals(ErrRetryFailed)
-	assert.Int64(int64(duration / time.Millisecond)).AtLeast(1900)
+	assert(errors.Cause(err), Equals, ErrRetryFailed)
+	assert(int64(duration/time.Millisecond), AtLeast, int64(1900))
 }
 
 func TestExponentialBackoff(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	startTime := time.Now()
 	called := 0
@@ -88,6 +88,6 @@ func TestExponentialBackoff(t *testing.T) {
 	})
 	duration := time.Since(startTime)
 
-	assert.Error(errors.Cause(err)).Equals(ErrRetryFailed)
-	assert.Int64(int64(duration / time.Millisecond)).AtLeast(4000)
+	assert(errors.Cause(err), Equals, ErrRetryFailed)
+	assert(int64(duration/time.Millisecond), AtLeast, int64(4000))
 }
diff --git a/common/serial/bytes_test.go b/common/serial/bytes_test.go
index a873395c7..65245f9e0 100644
--- a/common/serial/bytes_test.go
+++ b/common/serial/bytes_test.go
@@ -4,11 +4,11 @@ import (
 	"testing"
 
 	. "v2ray.com/core/common/serial"
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 )
 
 func TestBytesToHex(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	cases := []struct {
 		input  []byte
@@ -21,15 +21,15 @@ func TestBytesToHex(t *testing.T) {
 	}
 
 	for _, test := range cases {
-		assert.String(test.output).Equals(BytesToHexString(test.input))
+		assert(test.output, Equals, BytesToHexString(test.input))
 	}
 }
 
 func TestInt64(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	x := int64(375134875348)
 	b := Int64ToBytes(x, []byte{})
 	v := BytesToInt64(b)
-	assert.Int64(x).Equals(v)
+	assert(x, Equals, v)
 }
diff --git a/common/serial/numbers_test.go b/common/serial/numbers_test.go
index 9464df5b4..7d67f1edf 100644
--- a/common/serial/numbers_test.go
+++ b/common/serial/numbers_test.go
@@ -6,15 +6,15 @@ import (
 	"v2ray.com/core/common"
 	"v2ray.com/core/common/buf"
 	. "v2ray.com/core/common/serial"
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 )
 
 func TestUint32(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	x := uint32(458634234)
 	s1 := Uint32ToBytes(x, []byte{})
 	s2 := buf.New()
 	common.Must(s2.AppendSupplier(WriteUint32(x)))
-	assert.Bytes(s1).Equals(s2.Bytes())
+	assert(s1, Equals, s2.Bytes())
 }
diff --git a/common/serial/typed_message_test.go b/common/serial/typed_message_test.go
index 74da1b906..4bf7c540a 100644
--- a/common/serial/typed_message_test.go
+++ b/common/serial/typed_message_test.go
@@ -4,13 +4,13 @@ import (
 	"testing"
 
 	. "v2ray.com/core/common/serial"
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 )
 
 func TestGetInstance(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	p, err := GetInstance("")
-	assert.Pointer(p).IsNil()
-	assert.Error(err).IsNotNil()
+	assert(p, IsNil)
+	assert(err, IsNotNil)
 }
diff --git a/common/signal/exec_test.go b/common/signal/exec_test.go
index e335054fb..d6bac83b5 100644
--- a/common/signal/exec_test.go
+++ b/common/signal/exec_test.go
@@ -6,11 +6,11 @@ import (
 	"testing"
 
 	. "v2ray.com/core/common/signal"
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 )
 
 func TestErrorOrFinish2_Error(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	c1 := make(chan error, 1)
 	c2 := make(chan error, 2)
@@ -22,11 +22,11 @@ func TestErrorOrFinish2_Error(t *testing.T) {
 
 	c1 <- errors.New("test")
 	err := <-c
-	assert.String(err.Error()).Equals("test")
+	assert(err.Error(), Equals, "test")
 }
 
 func TestErrorOrFinish2_Error2(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	c1 := make(chan error, 1)
 	c2 := make(chan error, 2)
@@ -38,11 +38,11 @@ func TestErrorOrFinish2_Error2(t *testing.T) {
 
 	c2 <- errors.New("test")
 	err := <-c
-	assert.String(err.Error()).Equals("test")
+	assert(err.Error(), Equals, "test")
 }
 
 func TestErrorOrFinish2_NoneError(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	c1 := make(chan error, 1)
 	c2 := make(chan error, 2)
@@ -61,11 +61,11 @@ func TestErrorOrFinish2_NoneError(t *testing.T) {
 
 	close(c2)
 	err := <-c
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 }
 
 func TestErrorOrFinish2_NoneError2(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	c1 := make(chan error, 1)
 	c2 := make(chan error, 2)
@@ -84,5 +84,5 @@ func TestErrorOrFinish2_NoneError2(t *testing.T) {
 
 	close(c1)
 	err := <-c
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 }
diff --git a/common/signal/timer_test.go b/common/signal/timer_test.go
index 8c5f57e6b..abaa9f6a5 100644
--- a/common/signal/timer_test.go
+++ b/common/signal/timer_test.go
@@ -7,26 +7,26 @@ import (
 	"time"
 
 	. "v2ray.com/core/common/signal"
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 )
 
 func TestActivityTimer(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	ctx, timer := CancelAfterInactivity(context.Background(), time.Second*5)
 	time.Sleep(time.Second * 6)
-	assert.Error(ctx.Err()).IsNotNil()
+	assert(ctx.Err(), IsNotNil)
 	runtime.KeepAlive(timer)
 }
 
 func TestActivityTimerUpdate(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	ctx, timer := CancelAfterInactivity(context.Background(), time.Second*10)
 	time.Sleep(time.Second * 3)
-	assert.Error(ctx.Err()).IsNil()
+	assert(ctx.Err(), IsNil)
 	timer.SetTimeout(time.Second * 1)
 	time.Sleep(time.Second * 2)
-	assert.Error(ctx.Err()).IsNotNil()
+	assert(ctx.Err(), IsNotNil)
 	runtime.KeepAlive(timer)
 }
diff --git a/common/uuid/uuid_test.go b/common/uuid/uuid_test.go
index 27d1e1499..f8b90085e 100644
--- a/common/uuid/uuid_test.go
+++ b/common/uuid/uuid_test.go
@@ -4,74 +4,74 @@ import (
 	"testing"
 
 	. "v2ray.com/core/common/uuid"
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 )
 
 func TestParseBytes(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	str := "2418d087-648d-4990-86e8-19dca1d006d3"
 	bytes := []byte{0x24, 0x18, 0xd0, 0x87, 0x64, 0x8d, 0x49, 0x90, 0x86, 0xe8, 0x19, 0xdc, 0xa1, 0xd0, 0x06, 0xd3}
 
 	uuid, err := ParseBytes(bytes)
-	assert.Error(err).IsNil()
-	assert.String(uuid.String()).Equals(str)
+	assert(err, IsNil)
+	assert(uuid.String(), Equals, str)
 
 	_, err = ParseBytes([]byte{1, 3, 2, 4})
-	assert.Error(err).IsNotNil()
+	assert(err, IsNotNil)
 }
 
 func TestParseString(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	str := "2418d087-648d-4990-86e8-19dca1d006d3"
 	expectedBytes := []byte{0x24, 0x18, 0xd0, 0x87, 0x64, 0x8d, 0x49, 0x90, 0x86, 0xe8, 0x19, 0xdc, 0xa1, 0xd0, 0x06, 0xd3}
 
 	uuid, err := ParseString(str)
-	assert.Error(err).IsNil()
-	assert.Bytes(uuid.Bytes()).Equals(expectedBytes)
+	assert(err, IsNil)
+	assert(uuid.Bytes(), Equals, expectedBytes)
 
 	uuid, err = ParseString("2418d087")
-	assert.Error(err).IsNotNil()
+	assert(err, IsNotNil)
 
 	uuid, err = ParseString("2418d087-648k-4990-86e8-19dca1d006d3")
-	assert.Error(err).IsNotNil()
+	assert(err, IsNotNil)
 }
 
 func TestNewUUID(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	uuid := New()
 	uuid2, err := ParseString(uuid.String())
 
-	assert.Error(err).IsNil()
-	assert.String(uuid.String()).Equals(uuid2.String())
-	assert.Bytes(uuid.Bytes()).Equals(uuid2.Bytes())
+	assert(err, IsNil)
+	assert(uuid.String(), Equals, uuid2.String())
+	assert(uuid.Bytes(), Equals, uuid2.Bytes())
 }
 
 func TestRandom(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	uuid := New()
 	uuid2 := New()
 
-	assert.String(uuid.String()).NotEquals(uuid2.String())
-	assert.Bytes(uuid.Bytes()).NotEquals(uuid2.Bytes())
+	assert(uuid.String(), NotEquals, uuid2.String())
+	assert(uuid.Bytes(), NotEquals, uuid2.Bytes())
 }
 
 func TestEquals(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	var uuid *UUID = nil
 	var uuid2 *UUID = nil
-	assert.Bool(uuid.Equals(uuid2)).IsTrue()
-	assert.Bool(uuid.Equals(New())).IsFalse()
+	assert(uuid.Equals(uuid2), IsTrue)
+	assert(uuid.Equals(New()), IsFalse)
 }
 
 func TestNext(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	uuid := New()
 	uuid2 := uuid.Next()
-	assert.Bool(uuid.Equals(uuid2)).IsFalse()
+	assert(uuid.Equals(uuid2), IsFalse)
 }
diff --git a/proxy/blackhole/config_test.go b/proxy/blackhole/config_test.go
index 7678d7cf6..1e5ad3525 100644
--- a/proxy/blackhole/config_test.go
+++ b/proxy/blackhole/config_test.go
@@ -7,11 +7,11 @@ import (
 
 	"v2ray.com/core/common/buf"
 	. "v2ray.com/core/proxy/blackhole"
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 )
 
 func TestHTTPResponse(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	buffer := buf.New()
 
@@ -20,6 +20,6 @@ func TestHTTPResponse(t *testing.T) {
 
 	reader := bufio.NewReader(buffer)
 	response, err := http.ReadResponse(reader, nil)
-	assert.Error(err).IsNil()
-	assert.Int(response.StatusCode).Equals(403)
+	assert(err, IsNil)
+	assert(response.StatusCode, Equals, 403)
 }
diff --git a/proxy/http/server_test.go b/proxy/http/server_test.go
index 2bc370a2e..f2d1dafc0 100644
--- a/proxy/http/server_test.go
+++ b/proxy/http/server_test.go
@@ -7,13 +7,13 @@ import (
 	"testing"
 
 	. "v2ray.com/core/proxy/http"
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 
 	_ "v2ray.com/core/transport/internet/tcp"
 )
 
 func TestHopByHopHeadersStrip(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	rawRequest := `GET /pkg/net/http/ HTTP/1.1
 Host: golang.org
@@ -31,17 +31,17 @@ Accept-Language: de,en;q=0.7,en-us;q=0.3
 `
 	b := bufio.NewReader(strings.NewReader(rawRequest))
 	req, err := http.ReadRequest(b)
-	assert.Error(err).IsNil()
-	assert.String(req.Header.Get("Foo")).Equals("foo")
-	assert.String(req.Header.Get("Bar")).Equals("bar")
-	assert.String(req.Header.Get("Connection")).Equals("keep-alive,Foo, Bar")
-	assert.String(req.Header.Get("Proxy-Connection")).Equals("keep-alive")
-	assert.String(req.Header.Get("Proxy-Authenticate")).Equals("abc")
+	assert(err, IsNil)
+	assert(req.Header.Get("Foo"), Equals, "foo")
+	assert(req.Header.Get("Bar"), Equals, "bar")
+	assert(req.Header.Get("Connection"), Equals, "keep-alive,Foo, Bar")
+	assert(req.Header.Get("Proxy-Connection"), Equals, "keep-alive")
+	assert(req.Header.Get("Proxy-Authenticate"), Equals, "abc")
 
 	StripHopByHopHeaders(req.Header)
-	assert.String(req.Header.Get("Connection")).IsEmpty()
-	assert.String(req.Header.Get("Foo")).IsEmpty()
-	assert.String(req.Header.Get("Bar")).IsEmpty()
-	assert.String(req.Header.Get("Proxy-Connection")).IsEmpty()
-	assert.String(req.Header.Get("Proxy-Authenticate")).IsEmpty()
+	assert(req.Header.Get("Connection"), IsEmpty)
+	assert(req.Header.Get("Foo"), IsEmpty)
+	assert(req.Header.Get("Bar"), IsEmpty)
+	assert(req.Header.Get("Proxy-Connection"), IsEmpty)
+	assert(req.Header.Get("Proxy-Authenticate"), IsEmpty)
 }
diff --git a/proxy/shadowsocks/ota_test.go b/proxy/shadowsocks/ota_test.go
index dda777e1d..b93d55a69 100644
--- a/proxy/shadowsocks/ota_test.go
+++ b/proxy/shadowsocks/ota_test.go
@@ -5,11 +5,11 @@ import (
 
 	"v2ray.com/core/common/buf"
 	. "v2ray.com/core/proxy/shadowsocks"
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 )
 
 func TestNormalChunkReading(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	buffer := buf.New()
 	buffer.AppendBytes(
@@ -17,12 +17,12 @@ func TestNormalChunkReading(t *testing.T) {
 	reader := NewChunkReader(buffer, NewAuthenticator(ChunkKeyGenerator(
 		[]byte{21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36})))
 	payload, err := reader.Read()
-	assert.Error(err).IsNil()
-	assert.Bytes(payload[0].Bytes()).Equals([]byte{11, 12, 13, 14, 15, 16, 17, 18})
+	assert(err, IsNil)
+	assert(payload[0].Bytes(), Equals, []byte{11, 12, 13, 14, 15, 16, 17, 18})
 }
 
 func TestNormalChunkWriting(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	buffer := buf.NewLocal(512)
 	writer := NewChunkWriter(buffer, NewAuthenticator(ChunkKeyGenerator(
@@ -31,6 +31,6 @@ func TestNormalChunkWriting(t *testing.T) {
 	b := buf.NewLocal(256)
 	b.Append([]byte{11, 12, 13, 14, 15, 16, 17, 18})
 	err := writer.Write(buf.NewMultiBufferValue(b))
-	assert.Error(err).IsNil()
-	assert.Bytes(buffer.Bytes()).Equals([]byte{0, 8, 39, 228, 69, 96, 133, 39, 254, 26, 201, 70, 11, 12, 13, 14, 15, 16, 17, 18})
+	assert(err, IsNil)
+	assert(buffer.Bytes(), Equals, []byte{0, 8, 39, 228, 69, 96, 133, 39, 254, 26, 201, 70, 11, 12, 13, 14, 15, 16, 17, 18})
 }
diff --git a/proxy/shadowsocks/protocol_test.go b/proxy/shadowsocks/protocol_test.go
index 5371868c8..763bd26b2 100644
--- a/proxy/shadowsocks/protocol_test.go
+++ b/proxy/shadowsocks/protocol_test.go
@@ -8,11 +8,11 @@ import (
 	"v2ray.com/core/common/protocol"
 	"v2ray.com/core/common/serial"
 	. "v2ray.com/core/proxy/shadowsocks"
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 )
 
 func TestUDPEncoding(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	request := &protocol.RequestHeader{
 		Version: Version,
@@ -32,17 +32,17 @@ func TestUDPEncoding(t *testing.T) {
 	data := buf.NewLocal(256)
 	data.AppendSupplier(serial.WriteString("test string"))
 	encodedData, err := EncodeUDPPacket(request, data.Bytes())
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	decodedRequest, decodedData, err := DecodeUDPPacket(request.User, encodedData)
-	assert.Error(err).IsNil()
-	assert.Bytes(decodedData.Bytes()).Equals(data.Bytes())
-	assert.Address(decodedRequest.Address).Equals(request.Address)
-	assert.Port(decodedRequest.Port).Equals(request.Port)
+	assert(err, IsNil)
+	assert(decodedData.Bytes(), Equals, data.Bytes())
+	assert(decodedRequest.Address, Equals, request.Address)
+	assert(decodedRequest.Port, Equals, request.Port)
 }
 
 func TestTCPRequest(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	cases := []struct {
 		request *protocol.RequestHeader
@@ -110,18 +110,18 @@ func TestTCPRequest(t *testing.T) {
 		defer cache.Release()
 
 		writer, err := WriteTCPRequest(request, cache)
-		assert.Error(err).IsNil()
+		assert(err, IsNil)
 
-		assert.Error(writer.Write(buf.NewMultiBufferValue(data))).IsNil()
+		assert(writer.Write(buf.NewMultiBufferValue(data)), IsNil)
 
 		decodedRequest, reader, err := ReadTCPSession(request.User, cache)
-		assert.Error(err).IsNil()
-		assert.Address(decodedRequest.Address).Equals(request.Address)
-		assert.Port(decodedRequest.Port).Equals(request.Port)
+		assert(err, IsNil)
+		assert(decodedRequest.Address, Equals, request.Address)
+		assert(decodedRequest.Port, Equals, request.Port)
 
 		decodedData, err := reader.Read()
-		assert.Error(err).IsNil()
-		assert.String(decodedData[0].String()).Equals(string(payload))
+		assert(err, IsNil)
+		assert(decodedData[0].String(), Equals, string(payload))
 	}
 
 	for _, test := range cases {
@@ -131,7 +131,7 @@ func TestTCPRequest(t *testing.T) {
 }
 
 func TestUDPReaderWriter(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	user := &protocol.User{
 		Account: serial.ToTypedMessage(&Account{
@@ -159,18 +159,18 @@ func TestUDPReaderWriter(t *testing.T) {
 	b := buf.New()
 	b.AppendSupplier(serial.WriteString("test payload"))
 	err := writer.Write(buf.NewMultiBufferValue(b))
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	payload, err := reader.Read()
-	assert.Error(err).IsNil()
-	assert.String(payload[0].String()).Equals("test payload")
+	assert(err, IsNil)
+	assert(payload[0].String(), Equals, "test payload")
 
 	b = buf.New()
 	b.AppendSupplier(serial.WriteString("test payload 2"))
 	err = writer.Write(buf.NewMultiBufferValue(b))
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	payload, err = reader.Read()
-	assert.Error(err).IsNil()
-	assert.String(payload[0].String()).Equals("test payload 2")
+	assert(err, IsNil)
+	assert(payload[0].String(), Equals, "test payload 2")
 }
diff --git a/proxy/socks/protocol_test.go b/proxy/socks/protocol_test.go
index f0111abc4..61f2d8dbd 100644
--- a/proxy/socks/protocol_test.go
+++ b/proxy/socks/protocol_test.go
@@ -7,11 +7,11 @@ import (
 	"v2ray.com/core/common/net"
 	"v2ray.com/core/common/protocol"
 	. "v2ray.com/core/proxy/socks"
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 )
 
 func TestUDPEncoding(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	b := buf.New()
 
@@ -24,11 +24,11 @@ func TestUDPEncoding(t *testing.T) {
 	content := []byte{'a'}
 	payload := buf.New()
 	payload.Append(content)
-	assert.Error(writer.Write(buf.NewMultiBufferValue(payload))).IsNil()
+	assert(writer.Write(buf.NewMultiBufferValue(payload)), IsNil)
 
 	reader := NewUDPReader(b)
 
 	decodedPayload, err := reader.Read()
-	assert.Error(err).IsNil()
-	assert.Bytes(decodedPayload[0].Bytes()).Equals(content)
+	assert(err, IsNil)
+	assert(decodedPayload[0].Bytes(), Equals, content)
 }
diff --git a/proxy/vmess/encoding/auth_test.go b/proxy/vmess/encoding/auth_test.go
index a160fdea9..c8abb584b 100644
--- a/proxy/vmess/encoding/auth_test.go
+++ b/proxy/vmess/encoding/auth_test.go
@@ -6,11 +6,11 @@ import (
 
 	"v2ray.com/core/common"
 	. "v2ray.com/core/proxy/vmess/encoding"
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 )
 
 func TestFnvAuth(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 	fnvAuth := new(FnvAuthenticator)
 
 	expectedText := make([]byte, 256)
@@ -20,7 +20,7 @@ func TestFnvAuth(t *testing.T) {
 	buffer := make([]byte, 512)
 	b := fnvAuth.Seal(buffer[:0], nil, expectedText, nil)
 	b, err = fnvAuth.Open(buffer[:0], nil, b, nil)
-	assert.Error(err).IsNil()
-	assert.Int(len(b)).Equals(256)
-	assert.Bytes(b).Equals(expectedText)
+	assert(err, IsNil)
+	assert(len(b), Equals, 256)
+	assert(b, Equals, expectedText)
 }
diff --git a/proxy/vmess/encoding/commands_test.go b/proxy/vmess/encoding/commands_test.go
index 142c73cb7..f0d93bde5 100644
--- a/proxy/vmess/encoding/commands_test.go
+++ b/proxy/vmess/encoding/commands_test.go
@@ -7,11 +7,11 @@ import (
 	"v2ray.com/core/common/protocol"
 	"v2ray.com/core/common/uuid"
 	. "v2ray.com/core/proxy/vmess/encoding"
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 )
 
 func TestSwitchAccount(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	sa := &protocol.CommandSwitchAccount{
 		Port:     1234,
@@ -23,18 +23,18 @@ func TestSwitchAccount(t *testing.T) {
 
 	buffer := buf.New()
 	err := MarshalCommand(sa, buffer)
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	cmd, err := UnmarshalCommand(1, buffer.BytesFrom(2))
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	sa2, ok := cmd.(*protocol.CommandSwitchAccount)
-	assert.Bool(ok).IsTrue()
-	assert.Pointer(sa.Host).IsNil()
-	assert.Pointer(sa2.Host).IsNil()
-	assert.Port(sa.Port).Equals(sa2.Port)
-	assert.String(sa.ID.String()).Equals(sa2.ID.String())
-	assert.Uint16(sa.AlterIds).Equals(sa2.AlterIds)
-	assert.Byte(byte(sa.Level)).Equals(byte(sa2.Level))
-	assert.Byte(sa.ValidMin).Equals(sa2.ValidMin)
+	assert(ok, IsTrue)
+	assert(sa.Host, IsNil)
+	assert(sa2.Host, IsNil)
+	assert(sa.Port, Equals, sa2.Port)
+	assert(sa.ID.String(), Equals, sa2.ID.String())
+	assert(sa.AlterIds, Equals, sa2.AlterIds)
+	assert(byte(sa.Level), Equals, byte(sa2.Level))
+	assert(sa.ValidMin, Equals, sa2.ValidMin)
 }
diff --git a/proxy/vmess/encoding/encoding_test.go b/proxy/vmess/encoding/encoding_test.go
index 043e33840..6ed0edc1f 100644
--- a/proxy/vmess/encoding/encoding_test.go
+++ b/proxy/vmess/encoding/encoding_test.go
@@ -12,11 +12,11 @@ import (
 	"v2ray.com/core/common/uuid"
 	"v2ray.com/core/proxy/vmess"
 	. "v2ray.com/core/proxy/vmess/encoding"
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 )
 
 func TestRequestSerialization(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	user := &protocol.User{
 		Level: 0,
@@ -52,18 +52,18 @@ func TestRequestSerialization(t *testing.T) {
 
 	server := NewServerSession(userValidator, sessionHistory)
 	actualRequest, err := server.DecodeRequestHeader(buffer)
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
-	assert.Byte(expectedRequest.Version).Equals(actualRequest.Version)
-	assert.Byte(byte(expectedRequest.Command)).Equals(byte(actualRequest.Command))
-	assert.Byte(byte(expectedRequest.Option)).Equals(byte(actualRequest.Option))
-	assert.Address(expectedRequest.Address).Equals(actualRequest.Address)
-	assert.Port(expectedRequest.Port).Equals(actualRequest.Port)
-	assert.Byte(byte(expectedRequest.Security)).Equals(byte(actualRequest.Security))
+	assert(expectedRequest.Version, Equals, actualRequest.Version)
+	assert(byte(expectedRequest.Command), Equals, byte(actualRequest.Command))
+	assert(byte(expectedRequest.Option), Equals, byte(actualRequest.Option))
+	assert(expectedRequest.Address, Equals, actualRequest.Address)
+	assert(expectedRequest.Port, Equals, actualRequest.Port)
+	assert(byte(expectedRequest.Security), Equals, byte(actualRequest.Security))
 
 	_, err = server.DecodeRequestHeader(buffer2)
 	// anti replay attack
-	assert.Error(err).IsNotNil()
+	assert(err, IsNotNil)
 
 	cancel()
 }
diff --git a/testing/scenarios/dns_test.go b/testing/scenarios/dns_test.go
index aadb66205..0360d1578 100644
--- a/testing/scenarios/dns_test.go
+++ b/testing/scenarios/dns_test.go
@@ -14,18 +14,18 @@ import (
 	"v2ray.com/core/proxy/blackhole"
 	"v2ray.com/core/proxy/freedom"
 	"v2ray.com/core/proxy/socks"
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 	"v2ray.com/core/testing/servers/tcp"
 )
 
 func TestResolveIP(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	tcpServer := tcp.Server{
 		MsgProcessor: xor,
 	}
 	dest, err := tcpServer.Start()
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 	defer tcpServer.Close()
 
 	serverPort := pickPort()
@@ -81,24 +81,24 @@ func TestResolveIP(t *testing.T) {
 	}
 
 	servers, err := InitializeServerConfigs(serverConfig)
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	{
 		noAuthDialer, err := xproxy.SOCKS5("tcp", net.TCPDestination(net.LocalHostIP, serverPort).NetAddr(), nil, xproxy.Direct)
-		assert.Error(err).IsNil()
+		assert(err, IsNil)
 		conn, err := noAuthDialer.Dial("tcp", fmt.Sprintf("google.com:%d", dest.Port))
-		assert.Error(err).IsNil()
+		assert(err, IsNil)
 
 		payload := "test payload"
 		nBytes, err := conn.Write([]byte(payload))
-		assert.Error(err).IsNil()
-		assert.Int(nBytes).Equals(len(payload))
+		assert(err, IsNil)
+		assert(nBytes, Equals, len(payload))
 
 		response := make([]byte, 1024)
 		nBytes, err = conn.Read(response)
-		assert.Error(err).IsNil()
-		assert.Bytes(response[:nBytes]).Equals(xor([]byte(payload)))
-		assert.Error(conn.Close()).IsNil()
+		assert(err, IsNil)
+		assert(response[:nBytes], Equals, xor([]byte(payload)))
+		assert(conn.Close(), IsNil)
 	}
 
 	CloseAllServers(servers)
diff --git a/testing/scenarios/dokodemo_test.go b/testing/scenarios/dokodemo_test.go
index 0c88d0eb4..9deee05bc 100644
--- a/testing/scenarios/dokodemo_test.go
+++ b/testing/scenarios/dokodemo_test.go
@@ -15,19 +15,19 @@ import (
 	"v2ray.com/core/proxy/vmess"
 	"v2ray.com/core/proxy/vmess/inbound"
 	"v2ray.com/core/proxy/vmess/outbound"
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 	"v2ray.com/core/testing/servers/tcp"
 	"v2ray.com/core/testing/servers/udp"
 )
 
 func TestDokodemoTCP(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	tcpServer := tcp.Server{
 		MsgProcessor: xor,
 	}
 	dest, err := tcpServer.Start()
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 	defer tcpServer.Close()
 
 	userID := protocol.NewID(uuid.New())
@@ -109,38 +109,38 @@ func TestDokodemoTCP(t *testing.T) {
 	}
 
 	servers, err := InitializeServerConfigs(serverConfig, clientConfig)
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	for port := clientPort; port <= clientPort+clientPortRange; port++ {
 		conn, err := net.DialTCP("tcp", nil, &net.TCPAddr{
 			IP:   []byte{127, 0, 0, 1},
 			Port: int(port),
 		})
-		assert.Error(err).IsNil()
+		assert(err, IsNil)
 
 		payload := "dokodemo request."
 		nBytes, err := conn.Write([]byte(payload))
-		assert.Error(err).IsNil()
-		assert.Int(nBytes).Equals(len(payload))
+		assert(err, IsNil)
+		assert(nBytes, Equals, len(payload))
 
 		response := make([]byte, 1024)
 		nBytes, err = conn.Read(response)
-		assert.Error(err).IsNil()
-		assert.Bytes(response[:nBytes]).Equals(xor([]byte(payload)))
-		assert.Error(conn.Close()).IsNil()
+		assert(err, IsNil)
+		assert(response[:nBytes], Equals, xor([]byte(payload)))
+		assert(conn.Close(), IsNil)
 	}
 
 	CloseAllServers(servers)
 }
 
 func TestDokodemoUDP(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	udpServer := udp.Server{
 		MsgProcessor: xor,
 	}
 	dest, err := udpServer.Start()
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 	defer udpServer.Close()
 
 	userID := protocol.NewID(uuid.New())
@@ -210,25 +210,25 @@ func TestDokodemoUDP(t *testing.T) {
 	}
 
 	servers, err := InitializeServerConfigs(serverConfig, clientConfig)
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	for port := clientPort; port <= clientPort+clientPortRange; port++ {
 		conn, err := net.DialUDP("udp", nil, &net.UDPAddr{
 			IP:   []byte{127, 0, 0, 1},
 			Port: int(port),
 		})
-		assert.Error(err).IsNil()
+		assert(err, IsNil)
 
 		payload := "dokodemo request."
 		nBytes, err := conn.Write([]byte(payload))
-		assert.Error(err).IsNil()
-		assert.Int(nBytes).Equals(len(payload))
+		assert(err, IsNil)
+		assert(nBytes, Equals, len(payload))
 
 		response := make([]byte, 1024)
 		nBytes, err = conn.Read(response)
-		assert.Error(err).IsNil()
-		assert.Bytes(response[:nBytes]).Equals(xor([]byte(payload)))
-		assert.Error(conn.Close()).IsNil()
+		assert(err, IsNil)
+		assert(response[:nBytes], Equals, xor([]byte(payload)))
+		assert(conn.Close(), IsNil)
 	}
 
 	CloseAllServers(servers)
diff --git a/testing/scenarios/feature_test.go b/testing/scenarios/feature_test.go
index 282bcbe1a..903fd943e 100644
--- a/testing/scenarios/feature_test.go
+++ b/testing/scenarios/feature_test.go
@@ -24,21 +24,21 @@ import (
 	"v2ray.com/core/proxy/vmess"
 	"v2ray.com/core/proxy/vmess/inbound"
 	"v2ray.com/core/proxy/vmess/outbound"
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 	"v2ray.com/core/testing/servers/tcp"
 	"v2ray.com/core/testing/servers/udp"
 	"v2ray.com/core/transport/internet"
 )
 
 func TestPassiveConnection(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	tcpServer := tcp.Server{
 		MsgProcessor: xor,
 		SendFirst:    []byte("send first"),
 	}
 	dest, err := tcpServer.Start()
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 	defer tcpServer.Close()
 
 	serverPort := pickPort()
@@ -66,49 +66,49 @@ func TestPassiveConnection(t *testing.T) {
 	}
 
 	servers, err := InitializeServerConfigs(serverConfig)
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	conn, err := net.DialTCP("tcp", nil, &net.TCPAddr{
 		IP:   []byte{127, 0, 0, 1},
 		Port: int(serverPort),
 	})
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	{
 		response := make([]byte, 1024)
 		nBytes, err := conn.Read(response)
-		assert.Error(err).IsNil()
-		assert.String(string(response[:nBytes])).Equals("send first")
+		assert(err, IsNil)
+		assert(string(response[:nBytes]), Equals, "send first")
 	}
 
 	payload := "dokodemo request."
 	{
 
 		nBytes, err := conn.Write([]byte(payload))
-		assert.Error(err).IsNil()
-		assert.Int(nBytes).Equals(len(payload))
+		assert(err, IsNil)
+		assert(nBytes, Equals, len(payload))
 	}
 
 	{
 		response := make([]byte, 1024)
 		nBytes, err := conn.Read(response)
-		assert.Error(err).IsNil()
-		assert.Bytes(response[:nBytes]).Equals(xor([]byte(payload)))
+		assert(err, IsNil)
+		assert(response[:nBytes], Equals, xor([]byte(payload)))
 	}
 
-	assert.Error(conn.Close()).IsNil()
+	assert(conn.Close(), IsNil)
 
 	CloseAllServers(servers)
 }
 
 func TestProxy(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	tcpServer := tcp.Server{
 		MsgProcessor: xor,
 	}
 	dest, err := tcpServer.Start()
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 	defer tcpServer.Close()
 
 	serverUserID := protocol.NewID(uuid.New())
@@ -227,36 +227,36 @@ func TestProxy(t *testing.T) {
 	}
 
 	servers, err := InitializeServerConfigs(serverConfig, proxyConfig, clientConfig)
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	conn, err := net.DialTCP("tcp", nil, &net.TCPAddr{
 		IP:   []byte{127, 0, 0, 1},
 		Port: int(clientPort),
 	})
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	payload := "dokodemo request."
 	nBytes, err := conn.Write([]byte(payload))
-	assert.Error(err).IsNil()
-	assert.Int(nBytes).Equals(len(payload))
+	assert(err, IsNil)
+	assert(nBytes, Equals, len(payload))
 
 	response := make([]byte, 1024)
 	nBytes, err = conn.Read(response)
-	assert.Error(err).IsNil()
-	assert.Bytes(response[:nBytes]).Equals(xor([]byte(payload)))
-	assert.Error(conn.Close()).IsNil()
+	assert(err, IsNil)
+	assert(response[:nBytes], Equals, xor([]byte(payload)))
+	assert(conn.Close(), IsNil)
 
 	CloseAllServers(servers)
 }
 
 func TestProxyOverKCP(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	tcpServer := tcp.Server{
 		MsgProcessor: xor,
 	}
 	dest, err := tcpServer.Start()
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 	defer tcpServer.Close()
 
 	serverUserID := protocol.NewID(uuid.New())
@@ -386,43 +386,43 @@ func TestProxyOverKCP(t *testing.T) {
 	}
 
 	servers, err := InitializeServerConfigs(serverConfig, proxyConfig, clientConfig)
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	conn, err := net.DialTCP("tcp", nil, &net.TCPAddr{
 		IP:   []byte{127, 0, 0, 1},
 		Port: int(clientPort),
 	})
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	payload := "dokodemo request."
 	nBytes, err := conn.Write([]byte(payload))
-	assert.Error(err).IsNil()
-	assert.Int(nBytes).Equals(len(payload))
+	assert(err, IsNil)
+	assert(nBytes, Equals, len(payload))
 
 	response := make([]byte, 1024)
 	nBytes, err = conn.Read(response)
-	assert.Error(err).IsNil()
-	assert.Bytes(response[:nBytes]).Equals(xor([]byte(payload)))
-	assert.Error(conn.Close()).IsNil()
+	assert(err, IsNil)
+	assert(response[:nBytes], Equals, xor([]byte(payload)))
+	assert(conn.Close(), IsNil)
 
 	CloseAllServers(servers)
 }
 
 func TestBlackhole(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	tcpServer := tcp.Server{
 		MsgProcessor: xor,
 	}
 	dest, err := tcpServer.Start()
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 	defer tcpServer.Close()
 
 	tcpServer2 := tcp.Server{
 		MsgProcessor: xor,
 	}
 	dest2, err := tcpServer2.Start()
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 	defer tcpServer2.Close()
 
 	serverPort := pickPort()
@@ -479,41 +479,41 @@ func TestBlackhole(t *testing.T) {
 	}
 
 	servers, err := InitializeServerConfigs(serverConfig)
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	conn, err := net.DialTCP("tcp", nil, &net.TCPAddr{
 		IP:   []byte{127, 0, 0, 1},
 		Port: int(serverPort2),
 	})
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	payload := "dokodemo request."
 	{
 
 		nBytes, err := conn.Write([]byte(payload))
-		assert.Error(err).IsNil()
-		assert.Int(nBytes).Equals(len(payload))
+		assert(err, IsNil)
+		assert(nBytes, Equals, len(payload))
 	}
 
 	{
 		response := make([]byte, 1024)
 		_, err := conn.Read(response)
-		assert.Error(err).IsNotNil()
+		assert(err, IsNotNil)
 	}
 
-	assert.Error(conn.Close()).IsNil()
+	assert(conn.Close(), IsNil)
 
 	CloseAllServers(servers)
 }
 
 func TestForward(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	tcpServer := tcp.Server{
 		MsgProcessor: xor,
 	}
 	dest, err := tcpServer.Start()
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 	defer tcpServer.Close()
 
 	serverPort := pickPort()
@@ -549,37 +549,37 @@ func TestForward(t *testing.T) {
 	}
 
 	servers, err := InitializeServerConfigs(serverConfig)
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	{
 		noAuthDialer, err := xproxy.SOCKS5("tcp", net.TCPDestination(net.LocalHostIP, serverPort).NetAddr(), nil, xproxy.Direct)
-		assert.Error(err).IsNil()
+		assert(err, IsNil)
 		conn, err := noAuthDialer.Dial("tcp", "google.com:80")
-		assert.Error(err).IsNil()
+		assert(err, IsNil)
 
 		payload := "test payload"
 		nBytes, err := conn.Write([]byte(payload))
-		assert.Error(err).IsNil()
-		assert.Int(nBytes).Equals(len(payload))
+		assert(err, IsNil)
+		assert(nBytes, Equals, len(payload))
 
 		response := make([]byte, 1024)
 		nBytes, err = conn.Read(response)
-		assert.Error(err).IsNil()
-		assert.Bytes(response[:nBytes]).Equals(xor([]byte(payload)))
-		assert.Error(conn.Close()).IsNil()
+		assert(err, IsNil)
+		assert(response[:nBytes], Equals, xor([]byte(payload)))
+		assert(conn.Close(), IsNil)
 	}
 
 	CloseAllServers(servers)
 }
 
 func TestUDPConnection(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	udpServer := udp.Server{
 		MsgProcessor: xor,
 	}
 	dest, err := udpServer.Start()
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 	defer udpServer.Close()
 
 	clientPort := pickPort()
@@ -607,28 +607,28 @@ func TestUDPConnection(t *testing.T) {
 	}
 
 	servers, err := InitializeServerConfigs(clientConfig)
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	{
 		conn, err := net.DialUDP("udp", nil, &net.UDPAddr{
 			IP:   []byte{127, 0, 0, 1},
 			Port: int(clientPort),
 		})
-		assert.Error(err).IsNil()
+		assert(err, IsNil)
 
 		payload := "dokodemo request."
 		for i := 0; i < 5; i++ {
 			nBytes, err := conn.Write([]byte(payload))
-			assert.Error(err).IsNil()
-			assert.Int(nBytes).Equals(len(payload))
+			assert(err, IsNil)
+			assert(nBytes, Equals, len(payload))
 
 			response := make([]byte, 1024)
 			nBytes, err = conn.Read(response)
-			assert.Error(err).IsNil()
-			assert.Bytes(response[:nBytes]).Equals(xor([]byte(payload)))
+			assert(err, IsNil)
+			assert(response[:nBytes], Equals, xor([]byte(payload)))
 		}
 
-		assert.Error(conn.Close()).IsNil()
+		assert(conn.Close(), IsNil)
 	}
 
 	time.Sleep(20 * time.Second)
@@ -638,25 +638,25 @@ func TestUDPConnection(t *testing.T) {
 			IP:   []byte{127, 0, 0, 1},
 			Port: int(clientPort),
 		})
-		assert.Error(err).IsNil()
+		assert(err, IsNil)
 
 		payload := "dokodemo request."
 		nBytes, err := conn.Write([]byte(payload))
-		assert.Error(err).IsNil()
-		assert.Int(nBytes).Equals(len(payload))
+		assert(err, IsNil)
+		assert(nBytes, Equals, len(payload))
 
 		response := make([]byte, 1024)
 		nBytes, err = conn.Read(response)
-		assert.Error(err).IsNil()
-		assert.Bytes(response[:nBytes]).Equals(xor([]byte(payload)))
-		assert.Error(conn.Close()).IsNil()
+		assert(err, IsNil)
+		assert(response[:nBytes], Equals, xor([]byte(payload)))
+		assert(conn.Close(), IsNil)
 	}
 
 	CloseAllServers(servers)
 }
 
 func TestDomainSniffing(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	sniffingPort := pickPort()
 	httpPort := pickPort()
@@ -725,7 +725,7 @@ func TestDomainSniffing(t *testing.T) {
 	}
 
 	servers, err := InitializeServerConfigs(serverConfig)
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	{
 		transport := &http.Transport{
@@ -739,10 +739,10 @@ func TestDomainSniffing(t *testing.T) {
 		}
 
 		resp, err := client.Get("https://www.github.com/")
-		assert.Error(err).IsNil()
-		assert.Int(resp.StatusCode).Equals(200)
+		assert(err, IsNil)
+		assert(resp.StatusCode, Equals, 200)
 
-		assert.Error(resp.Write(ioutil.Discard)).IsNil()
+		assert(resp.Write(ioutil.Discard), IsNil)
 	}
 
 	CloseAllServers(servers)
diff --git a/testing/scenarios/http_test.go b/testing/scenarios/http_test.go
index 181cc21cb..ad7ede42c 100644
--- a/testing/scenarios/http_test.go
+++ b/testing/scenarios/http_test.go
@@ -12,12 +12,12 @@ import (
 	"v2ray.com/core/common/serial"
 	"v2ray.com/core/proxy/freedom"
 	v2http "v2ray.com/core/proxy/http"
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 	v2httptest "v2ray.com/core/testing/servers/http"
 )
 
 func TestHttpConformance(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	httpServerPort := pickPort()
 	httpServer := &v2httptest.Server{
@@ -25,7 +25,7 @@ func TestHttpConformance(t *testing.T) {
 		PathHandler: make(map[string]http.HandlerFunc),
 	}
 	_, err := httpServer.Start()
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 	defer httpServer.Close()
 
 	serverPort := pickPort()
@@ -47,7 +47,7 @@ func TestHttpConformance(t *testing.T) {
 	}
 
 	servers, err := InitializeServerConfigs(serverConfig)
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	{
 		transport := &http.Transport{
@@ -61,12 +61,12 @@ func TestHttpConformance(t *testing.T) {
 		}
 
 		resp, err := client.Get("http://127.0.0.1:" + httpServerPort.String())
-		assert.Error(err).IsNil()
-		assert.Int(resp.StatusCode).Equals(200)
+		assert(err, IsNil)
+		assert(resp.StatusCode, Equals, 200)
 
 		content, err := ioutil.ReadAll(resp.Body)
-		assert.Error(err).IsNil()
-		assert.String(string(content)).Equals("Home")
+		assert(err, IsNil)
+		assert(string(content), Equals, "Home")
 
 	}
 
diff --git a/testing/scenarios/shadowsocks_test.go b/testing/scenarios/shadowsocks_test.go
index 3bfd948c5..94d8a0e96 100644
--- a/testing/scenarios/shadowsocks_test.go
+++ b/testing/scenarios/shadowsocks_test.go
@@ -15,19 +15,19 @@ import (
 	"v2ray.com/core/proxy/dokodemo"
 	"v2ray.com/core/proxy/freedom"
 	"v2ray.com/core/proxy/shadowsocks"
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 	"v2ray.com/core/testing/servers/tcp"
 	"v2ray.com/core/testing/servers/udp"
 )
 
 func TestShadowsocksAES256TCP(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	tcpServer := tcp.Server{
 		MsgProcessor: xor,
 	}
 	dest, err := tcpServer.Start()
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 	defer tcpServer.Close()
 
 	account := serial.ToTypedMessage(&shadowsocks.Account{
@@ -108,7 +108,7 @@ func TestShadowsocksAES256TCP(t *testing.T) {
 	}
 
 	servers, err := InitializeServerConfigs(serverConfig, clientConfig)
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	var wg sync.WaitGroup
 	wg.Add(10)
@@ -118,18 +118,18 @@ func TestShadowsocksAES256TCP(t *testing.T) {
 				IP:   []byte{127, 0, 0, 1},
 				Port: int(clientPort),
 			})
-			assert.Error(err).IsNil()
+			assert(err, IsNil)
 
 			payload := make([]byte, 10240*1024)
 			rand.Read(payload)
 
 			nBytes, err := conn.Write([]byte(payload))
-			assert.Error(err).IsNil()
-			assert.Int(nBytes).Equals(len(payload))
+			assert(err, IsNil)
+			assert(nBytes, Equals, len(payload))
 
 			response := readFrom(conn, time.Second*20, 10240*1024)
-			assert.Bytes(response).Equals(xor([]byte(payload)))
-			assert.Error(conn.Close()).IsNil()
+			assert(response, Equals, xor([]byte(payload)))
+			assert(conn.Close(), IsNil)
 			wg.Done()
 		}()
 	}
@@ -139,13 +139,13 @@ func TestShadowsocksAES256TCP(t *testing.T) {
 }
 
 func TestShadowsocksAES128UDP(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	udpServer := udp.Server{
 		MsgProcessor: xor,
 	}
 	dest, err := udpServer.Start()
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 	defer udpServer.Close()
 
 	account := serial.ToTypedMessage(&shadowsocks.Account{
@@ -227,7 +227,7 @@ func TestShadowsocksAES128UDP(t *testing.T) {
 	}
 
 	servers, err := InitializeServerConfigs(serverConfig, clientConfig)
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	var wg sync.WaitGroup
 	wg.Add(10)
@@ -237,18 +237,18 @@ func TestShadowsocksAES128UDP(t *testing.T) {
 				IP:   []byte{127, 0, 0, 1},
 				Port: int(clientPort),
 			})
-			assert.Error(err).IsNil()
+			assert(err, IsNil)
 
 			payload := make([]byte, 1024)
 			rand.Read(payload)
 
 			nBytes, err := conn.Write([]byte(payload))
-			assert.Error(err).IsNil()
-			assert.Int(nBytes).Equals(len(payload))
+			assert(err, IsNil)
+			assert(nBytes, Equals, len(payload))
 
 			response := readFrom(conn, time.Second*5, 1024)
-			assert.Bytes(response).Equals(xor([]byte(payload)))
-			assert.Error(conn.Close()).IsNil()
+			assert(response, Equals, xor([]byte(payload)))
+			assert(conn.Close(), IsNil)
 			wg.Done()
 		}()
 	}
@@ -258,13 +258,13 @@ func TestShadowsocksAES128UDP(t *testing.T) {
 }
 
 func TestShadowsocksChacha20TCP(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	tcpServer := tcp.Server{
 		MsgProcessor: xor,
 	}
 	dest, err := tcpServer.Start()
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 	defer tcpServer.Close()
 
 	account := serial.ToTypedMessage(&shadowsocks.Account{
@@ -345,7 +345,7 @@ func TestShadowsocksChacha20TCP(t *testing.T) {
 	}
 
 	servers, err := InitializeServerConfigs(serverConfig, clientConfig)
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	var wg sync.WaitGroup
 	wg.Add(10)
@@ -355,18 +355,18 @@ func TestShadowsocksChacha20TCP(t *testing.T) {
 				IP:   []byte{127, 0, 0, 1},
 				Port: int(clientPort),
 			})
-			assert.Error(err).IsNil()
+			assert(err, IsNil)
 
 			payload := make([]byte, 10240*1024)
 			rand.Read(payload)
 
 			nBytes, err := conn.Write([]byte(payload))
-			assert.Error(err).IsNil()
-			assert.Int(nBytes).Equals(len(payload))
+			assert(err, IsNil)
+			assert(nBytes, Equals, len(payload))
 
 			response := readFrom(conn, time.Second*20, 10240*1024)
-			assert.Bytes(response).Equals(xor([]byte(payload)))
-			assert.Error(conn.Close()).IsNil()
+			assert(response, Equals, xor([]byte(payload)))
+			assert(conn.Close(), IsNil)
 			wg.Done()
 		}()
 	}
diff --git a/testing/scenarios/socks_test.go b/testing/scenarios/socks_test.go
index 11f3a1e40..264ab2cdd 100644
--- a/testing/scenarios/socks_test.go
+++ b/testing/scenarios/socks_test.go
@@ -13,19 +13,19 @@ import (
 	"v2ray.com/core/proxy/dokodemo"
 	"v2ray.com/core/proxy/freedom"
 	"v2ray.com/core/proxy/socks"
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 	"v2ray.com/core/testing/servers/tcp"
 	"v2ray.com/core/testing/servers/udp"
 )
 
 func TestSocksBridgeTCP(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	tcpServer := tcp.Server{
 		MsgProcessor: xor,
 	}
 	dest, err := tcpServer.Start()
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 	defer tcpServer.Close()
 
 	serverPort := pickPort()
@@ -93,36 +93,36 @@ func TestSocksBridgeTCP(t *testing.T) {
 	}
 
 	servers, err := InitializeServerConfigs(serverConfig, clientConfig)
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	conn, err := net.DialTCP("tcp", nil, &net.TCPAddr{
 		IP:   []byte{127, 0, 0, 1},
 		Port: int(clientPort),
 	})
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	payload := "test payload"
 	nBytes, err := conn.Write([]byte(payload))
-	assert.Error(err).IsNil()
-	assert.Int(nBytes).Equals(len(payload))
+	assert(err, IsNil)
+	assert(nBytes, Equals, len(payload))
 
 	response := make([]byte, 1024)
 	nBytes, err = conn.Read(response)
-	assert.Error(err).IsNil()
-	assert.Bytes(response[:nBytes]).Equals(xor([]byte(payload)))
-	assert.Error(conn.Close()).IsNil()
+	assert(err, IsNil)
+	assert(response[:nBytes], Equals, xor([]byte(payload)))
+	assert(conn.Close(), IsNil)
 
 	CloseAllServers(servers)
 }
 
 func TestSocksBridageUDP(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	udpServer := udp.Server{
 		MsgProcessor: xor,
 	}
 	dest, err := udpServer.Start()
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 	defer udpServer.Close()
 
 	serverPort := pickPort()
@@ -190,36 +190,36 @@ func TestSocksBridageUDP(t *testing.T) {
 	}
 
 	servers, err := InitializeServerConfigs(serverConfig, clientConfig)
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	conn, err := net.DialUDP("udp", nil, &net.UDPAddr{
 		IP:   []byte{127, 0, 0, 1},
 		Port: int(clientPort),
 	})
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	payload := "dokodemo request."
 	nBytes, err := conn.Write([]byte(payload))
-	assert.Error(err).IsNil()
-	assert.Int(nBytes).Equals(len(payload))
+	assert(err, IsNil)
+	assert(nBytes, Equals, len(payload))
 
 	response := make([]byte, 1024)
 	nBytes, err = conn.Read(response)
-	assert.Error(err).IsNil()
-	assert.Bytes(response[:nBytes]).Equals(xor([]byte(payload)))
-	assert.Error(conn.Close()).IsNil()
+	assert(err, IsNil)
+	assert(response[:nBytes], Equals, xor([]byte(payload)))
+	assert(conn.Close(), IsNil)
 
 	CloseAllServers(servers)
 }
 
 func TestSocksConformance(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	tcpServer := tcp.Server{
 		MsgProcessor: xor,
 	}
 	dest, err := tcpServer.Start()
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 	defer tcpServer.Close()
 
 	authPort := pickPort()
@@ -263,76 +263,76 @@ func TestSocksConformance(t *testing.T) {
 	}
 
 	servers, err := InitializeServerConfigs(serverConfig)
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	{
 		noAuthDialer, err := xproxy.SOCKS5("tcp", net.TCPDestination(net.LocalHostIP, noAuthPort).NetAddr(), nil, xproxy.Direct)
-		assert.Error(err).IsNil()
+		assert(err, IsNil)
 		conn, err := noAuthDialer.Dial("tcp", dest.NetAddr())
-		assert.Error(err).IsNil()
+		assert(err, IsNil)
 
 		payload := "test payload"
 		nBytes, err := conn.Write([]byte(payload))
-		assert.Error(err).IsNil()
-		assert.Int(nBytes).Equals(len(payload))
+		assert(err, IsNil)
+		assert(nBytes, Equals, len(payload))
 
 		response := make([]byte, 1024)
 		nBytes, err = conn.Read(response)
-		assert.Error(err).IsNil()
-		assert.Bytes(response[:nBytes]).Equals(xor([]byte(payload)))
-		assert.Error(conn.Close()).IsNil()
+		assert(err, IsNil)
+		assert(response[:nBytes], Equals, xor([]byte(payload)))
+		assert(conn.Close(), IsNil)
 	}
 
 	{
 		authDialer, err := xproxy.SOCKS5("tcp", net.TCPDestination(net.LocalHostIP, authPort).NetAddr(), &xproxy.Auth{User: "Test Account", Password: "Test Password"}, xproxy.Direct)
-		assert.Error(err).IsNil()
+		assert(err, IsNil)
 		conn, err := authDialer.Dial("tcp", dest.NetAddr())
-		assert.Error(err).IsNil()
+		assert(err, IsNil)
 
 		payload := "test payload"
 		nBytes, err := conn.Write([]byte(payload))
-		assert.Error(err).IsNil()
-		assert.Int(nBytes).Equals(len(payload))
+		assert(err, IsNil)
+		assert(nBytes, Equals, len(payload))
 
 		response := make([]byte, 1024)
 		nBytes, err = conn.Read(response)
-		assert.Error(err).IsNil()
-		assert.Bytes(response[:nBytes]).Equals(xor([]byte(payload)))
-		assert.Error(conn.Close()).IsNil()
+		assert(err, IsNil)
+		assert(response[:nBytes], Equals, xor([]byte(payload)))
+		assert(conn.Close(), IsNil)
 	}
 
 	{
 		dialer := socks4.DialSocksProxy(socks4.SOCKS4, net.TCPDestination(net.LocalHostIP, noAuthPort).NetAddr())
 		conn, err := dialer("tcp", dest.NetAddr())
-		assert.Error(err).IsNil()
+		assert(err, IsNil)
 
 		payload := "test payload"
 		nBytes, err := conn.Write([]byte(payload))
-		assert.Error(err).IsNil()
-		assert.Int(nBytes).Equals(len(payload))
+		assert(err, IsNil)
+		assert(nBytes, Equals, len(payload))
 
 		response := make([]byte, 1024)
 		nBytes, err = conn.Read(response)
-		assert.Error(err).IsNil()
-		assert.Bytes(response[:nBytes]).Equals(xor([]byte(payload)))
-		assert.Error(conn.Close()).IsNil()
+		assert(err, IsNil)
+		assert(response[:nBytes], Equals, xor([]byte(payload)))
+		assert(conn.Close(), IsNil)
 	}
 
 	{
 		dialer := socks4.DialSocksProxy(socks4.SOCKS4A, net.TCPDestination(net.LocalHostIP, noAuthPort).NetAddr())
 		conn, err := dialer("tcp", net.TCPDestination(net.LocalHostDomain, tcpServer.Port).NetAddr())
-		assert.Error(err).IsNil()
+		assert(err, IsNil)
 
 		payload := "test payload"
 		nBytes, err := conn.Write([]byte(payload))
-		assert.Error(err).IsNil()
-		assert.Int(nBytes).Equals(len(payload))
+		assert(err, IsNil)
+		assert(nBytes, Equals, len(payload))
 
 		response := make([]byte, 1024)
 		nBytes, err = conn.Read(response)
-		assert.Error(err).IsNil()
-		assert.Bytes(response[:nBytes]).Equals(xor([]byte(payload)))
-		assert.Error(conn.Close()).IsNil()
+		assert(err, IsNil)
+		assert(response[:nBytes], Equals, xor([]byte(payload)))
+		assert(conn.Close(), IsNil)
 	}
 
 	CloseAllServers(servers)
diff --git a/testing/scenarios/tls_test.go b/testing/scenarios/tls_test.go
index 8204157e1..f60ba490a 100644
--- a/testing/scenarios/tls_test.go
+++ b/testing/scenarios/tls_test.go
@@ -16,7 +16,7 @@ import (
 	"v2ray.com/core/proxy/vmess"
 	"v2ray.com/core/proxy/vmess/inbound"
 	"v2ray.com/core/proxy/vmess/outbound"
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 	"v2ray.com/core/testing/servers/tcp"
 	tlsgen "v2ray.com/core/testing/tls"
 	"v2ray.com/core/transport/internet"
@@ -25,13 +25,13 @@ import (
 )
 
 func TestSimpleTLSConnection(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	tcpServer := tcp.Server{
 		MsgProcessor: xor,
 	}
 	dest, err := tcpServer.Start()
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 	defer tcpServer.Close()
 
 	userID := protocol.NewID(uuid.New())
@@ -118,34 +118,34 @@ func TestSimpleTLSConnection(t *testing.T) {
 	}
 
 	servers, err := InitializeServerConfigs(serverConfig, clientConfig)
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	conn, err := net.DialTCP("tcp", nil, &net.TCPAddr{
 		IP:   []byte{127, 0, 0, 1},
 		Port: int(clientPort),
 	})
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	payload := "dokodemo request."
 	nBytes, err := conn.Write([]byte(payload))
-	assert.Error(err).IsNil()
-	assert.Int(nBytes).Equals(len(payload))
+	assert(err, IsNil)
+	assert(nBytes, Equals, len(payload))
 
 	response := readFrom(conn, time.Second*2, len(payload))
-	assert.Bytes(response).Equals(xor([]byte(payload)))
-	assert.Error(conn.Close()).IsNil()
+	assert(response, Equals, xor([]byte(payload)))
+	assert(conn.Close(), IsNil)
 
 	CloseAllServers(servers)
 }
 
 func TestTLSOverKCP(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	tcpServer := tcp.Server{
 		MsgProcessor: xor,
 	}
 	dest, err := tcpServer.Start()
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 	defer tcpServer.Close()
 
 	userID := protocol.NewID(uuid.New())
@@ -234,34 +234,34 @@ func TestTLSOverKCP(t *testing.T) {
 	}
 
 	servers, err := InitializeServerConfigs(serverConfig, clientConfig)
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	conn, err := net.DialTCP("tcp", nil, &net.TCPAddr{
 		IP:   []byte{127, 0, 0, 1},
 		Port: int(clientPort),
 	})
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	payload := "dokodemo request."
 	nBytes, err := conn.Write([]byte(payload))
-	assert.Error(err).IsNil()
-	assert.Int(nBytes).Equals(len(payload))
+	assert(err, IsNil)
+	assert(nBytes, Equals, len(payload))
 
 	response := readFrom(conn, time.Second*2, len(payload))
-	assert.Bytes(response).Equals(xor([]byte(payload)))
-	assert.Error(conn.Close()).IsNil()
+	assert(response, Equals, xor([]byte(payload)))
+	assert(conn.Close(), IsNil)
 
 	CloseAllServers(servers)
 }
 
 func TestTLSOverWebSocket(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	tcpServer := tcp.Server{
 		MsgProcessor: xor,
 	}
 	dest, err := tcpServer.Start()
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 	defer tcpServer.Close()
 
 	userID := protocol.NewID(uuid.New())
@@ -356,23 +356,23 @@ func TestTLSOverWebSocket(t *testing.T) {
 	}
 
 	servers, err := InitializeServerConfigs(serverConfig, clientConfig)
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	conn, err := net.DialTCP("tcp", nil, &net.TCPAddr{
 		IP:   []byte{127, 0, 0, 1},
 		Port: int(clientPort),
 	})
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	payload := make([]byte, 10240*1024)
 	rand.Read(payload)
 	nBytes, err := conn.Write([]byte(payload))
-	assert.Error(err).IsNil()
-	assert.Int(nBytes).Equals(len(payload))
+	assert(err, IsNil)
+	assert(nBytes, Equals, len(payload))
 
 	response := readFrom(conn, time.Second*20, len(payload))
-	assert.Bytes(response).Equals(xor([]byte(payload)))
-	assert.Error(conn.Close()).IsNil()
+	assert(response, Equals, xor([]byte(payload)))
+	assert(conn.Close(), IsNil)
 
 	CloseAllServers(servers)
 }
diff --git a/testing/scenarios/transport_test.go b/testing/scenarios/transport_test.go
index e2052e01d..e5ae32699 100644
--- a/testing/scenarios/transport_test.go
+++ b/testing/scenarios/transport_test.go
@@ -15,7 +15,7 @@ import (
 	"v2ray.com/core/proxy/vmess"
 	"v2ray.com/core/proxy/vmess/inbound"
 	"v2ray.com/core/proxy/vmess/outbound"
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 	"v2ray.com/core/testing/servers/tcp"
 	"v2ray.com/core/transport/internet"
 	"v2ray.com/core/transport/internet/headers/http"
@@ -23,13 +23,13 @@ import (
 )
 
 func TestHttpConnectionHeader(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	tcpServer := tcp.Server{
 		MsgProcessor: xor,
 	}
 	dest, err := tcpServer.Start()
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 	defer tcpServer.Close()
 
 	userID := protocol.NewID(uuid.New())
@@ -120,22 +120,22 @@ func TestHttpConnectionHeader(t *testing.T) {
 	}
 
 	servers, err := InitializeServerConfigs(serverConfig, clientConfig)
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	conn, err := net.DialTCP("tcp", nil, &net.TCPAddr{
 		IP:   []byte{127, 0, 0, 1},
 		Port: int(clientPort),
 	})
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	payload := "dokodemo request."
 	nBytes, err := conn.Write([]byte(payload))
-	assert.Error(err).IsNil()
-	assert.Int(nBytes).Equals(len(payload))
+	assert(err, IsNil)
+	assert(nBytes, Equals, len(payload))
 
 	response := readFrom(conn, time.Second*2, len(payload))
-	assert.Bytes(response).Equals(xor([]byte(payload)))
-	assert.Error(conn.Close()).IsNil()
+	assert(response, Equals, xor([]byte(payload)))
+	assert(conn.Close(), IsNil)
 
 	CloseAllServers(servers)
 }
diff --git a/testing/scenarios/vmess_test.go b/testing/scenarios/vmess_test.go
index 80a53fbf6..d8c5edcfe 100644
--- a/testing/scenarios/vmess_test.go
+++ b/testing/scenarios/vmess_test.go
@@ -18,20 +18,20 @@ import (
 	"v2ray.com/core/proxy/vmess"
 	"v2ray.com/core/proxy/vmess/inbound"
 	"v2ray.com/core/proxy/vmess/outbound"
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 	"v2ray.com/core/testing/servers/tcp"
 	"v2ray.com/core/testing/servers/udp"
 	"v2ray.com/core/transport/internet"
 )
 
 func TestVMessDynamicPort(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	tcpServer := tcp.Server{
 		MsgProcessor: xor,
 	}
 	dest, err := tcpServer.Start()
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 	defer tcpServer.Close()
 
 	userID := protocol.NewID(uuid.New())
@@ -135,38 +135,38 @@ func TestVMessDynamicPort(t *testing.T) {
 	}
 
 	servers, err := InitializeServerConfigs(serverConfig, clientConfig)
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	for i := 0; i < 10; i++ {
 		conn, err := net.DialTCP("tcp", nil, &net.TCPAddr{
 			IP:   []byte{127, 0, 0, 1},
 			Port: int(clientPort),
 		})
-		assert.Error(err).IsNil()
+		assert(err, IsNil)
 
 		payload := "dokodemo request."
 		nBytes, err := conn.Write([]byte(payload))
-		assert.Error(err).IsNil()
-		assert.Int(nBytes).Equals(len(payload))
+		assert(err, IsNil)
+		assert(nBytes, Equals, len(payload))
 
 		response := make([]byte, 1024)
 		nBytes, err = conn.Read(response)
-		assert.Error(err).IsNil()
-		assert.Bytes(response[:nBytes]).Equals(xor([]byte(payload)))
-		assert.Error(conn.Close()).IsNil()
+		assert(err, IsNil)
+		assert(response[:nBytes], Equals, xor([]byte(payload)))
+		assert(conn.Close(), IsNil)
 	}
 
 	CloseAllServers(servers)
 }
 
 func TestVMessGCM(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	tcpServer := tcp.Server{
 		MsgProcessor: xor,
 	}
 	dest, err := tcpServer.Start()
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 	defer tcpServer.Close()
 
 	userID := protocol.NewID(uuid.New())
@@ -252,7 +252,7 @@ func TestVMessGCM(t *testing.T) {
 	}
 
 	servers, err := InitializeServerConfigs(serverConfig, clientConfig)
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	var wg sync.WaitGroup
 	wg.Add(10)
@@ -262,18 +262,18 @@ func TestVMessGCM(t *testing.T) {
 				IP:   []byte{127, 0, 0, 1},
 				Port: int(clientPort),
 			})
-			assert.Error(err).IsNil()
+			assert(err, IsNil)
 
 			payload := make([]byte, 10240*1024)
 			rand.Read(payload)
 
 			nBytes, err := conn.Write([]byte(payload))
-			assert.Error(err).IsNil()
-			assert.Int(nBytes).Equals(len(payload))
+			assert(err, IsNil)
+			assert(nBytes, Equals, len(payload))
 
 			response := readFrom(conn, time.Second*20, 10240*1024)
-			assert.Bytes(response).Equals(xor([]byte(payload)))
-			assert.Error(conn.Close()).IsNil()
+			assert(response, Equals, xor([]byte(payload)))
+			assert(conn.Close(), IsNil)
 			wg.Done()
 		}()
 	}
@@ -283,13 +283,13 @@ func TestVMessGCM(t *testing.T) {
 }
 
 func TestVMessGCMUDP(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	udpServer := udp.Server{
 		MsgProcessor: xor,
 	}
 	dest, err := udpServer.Start()
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 	defer udpServer.Close()
 
 	userID := protocol.NewID(uuid.New())
@@ -375,7 +375,7 @@ func TestVMessGCMUDP(t *testing.T) {
 	}
 
 	servers, err := InitializeServerConfigs(serverConfig, clientConfig)
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	var wg sync.WaitGroup
 	wg.Add(10)
@@ -385,28 +385,28 @@ func TestVMessGCMUDP(t *testing.T) {
 				IP:   []byte{127, 0, 0, 1},
 				Port: int(clientPort),
 			})
-			assert.Error(err).IsNil()
+			assert(err, IsNil)
 
 			payload := make([]byte, 1024)
 			rand.Read(payload)
 
 			nBytes, err := conn.Write([]byte(payload))
-			assert.Error(err).IsNil()
-			assert.Int(nBytes).Equals(len(payload))
+			assert(err, IsNil)
+			assert(nBytes, Equals, len(payload))
 
 			payload1 := make([]byte, 1024)
 			rand.Read(payload1)
 			nBytes, err = conn.Write([]byte(payload1))
-			assert.Error(err).IsNil()
-			assert.Int(nBytes).Equals(len(payload1))
+			assert(err, IsNil)
+			assert(nBytes, Equals, len(payload1))
 
 			response := readFrom(conn, time.Second*5, 1024)
-			assert.Bytes(response).Equals(xor([]byte(payload)))
+			assert(response, Equals, xor([]byte(payload)))
 
 			response = readFrom(conn, time.Second*5, 1024)
-			assert.Bytes(response).Equals(xor([]byte(payload1)))
+			assert(response, Equals, xor([]byte(payload1)))
 
-			assert.Error(conn.Close()).IsNil()
+			assert(conn.Close(), IsNil)
 			wg.Done()
 		}()
 	}
@@ -416,13 +416,13 @@ func TestVMessGCMUDP(t *testing.T) {
 }
 
 func TestVMessChacha20(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	tcpServer := tcp.Server{
 		MsgProcessor: xor,
 	}
 	dest, err := tcpServer.Start()
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 	defer tcpServer.Close()
 
 	userID := protocol.NewID(uuid.New())
@@ -508,7 +508,7 @@ func TestVMessChacha20(t *testing.T) {
 	}
 
 	servers, err := InitializeServerConfigs(serverConfig, clientConfig)
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	var wg sync.WaitGroup
 	wg.Add(10)
@@ -518,18 +518,18 @@ func TestVMessChacha20(t *testing.T) {
 				IP:   []byte{127, 0, 0, 1},
 				Port: int(clientPort),
 			})
-			assert.Error(err).IsNil()
+			assert(err, IsNil)
 
 			payload := make([]byte, 10240*1024)
 			rand.Read(payload)
 
 			nBytes, err := conn.Write([]byte(payload))
-			assert.Error(err).IsNil()
-			assert.Int(nBytes).Equals(len(payload))
+			assert(err, IsNil)
+			assert(nBytes, Equals, len(payload))
 
 			response := readFrom(conn, time.Second*20, 10240*1024)
-			assert.Bytes(response).Equals(xor([]byte(payload)))
-			assert.Error(conn.Close()).IsNil()
+			assert(response, Equals, xor([]byte(payload)))
+			assert(conn.Close(), IsNil)
 			wg.Done()
 		}()
 	}
@@ -539,13 +539,13 @@ func TestVMessChacha20(t *testing.T) {
 }
 
 func TestVMessNone(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	tcpServer := tcp.Server{
 		MsgProcessor: xor,
 	}
 	dest, err := tcpServer.Start()
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 	defer tcpServer.Close()
 
 	userID := protocol.NewID(uuid.New())
@@ -631,7 +631,7 @@ func TestVMessNone(t *testing.T) {
 	}
 
 	servers, err := InitializeServerConfigs(serverConfig, clientConfig)
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	var wg sync.WaitGroup
 	wg.Add(10)
@@ -641,18 +641,18 @@ func TestVMessNone(t *testing.T) {
 				IP:   []byte{127, 0, 0, 1},
 				Port: int(clientPort),
 			})
-			assert.Error(err).IsNil()
+			assert(err, IsNil)
 
 			payload := make([]byte, 1024*1024)
 			rand.Read(payload)
 
 			nBytes, err := conn.Write(payload)
-			assert.Error(err).IsNil()
-			assert.Int(nBytes).Equals(len(payload))
+			assert(err, IsNil)
+			assert(nBytes, Equals, len(payload))
 
 			response := readFrom(conn, time.Second*20, 1024*1024)
-			assert.Bytes(response).Equals(xor(payload))
-			assert.Error(conn.Close()).IsNil()
+			assert(response, Equals, xor(payload))
+			assert(conn.Close(), IsNil)
 			wg.Done()
 		}()
 	}
@@ -662,13 +662,13 @@ func TestVMessNone(t *testing.T) {
 }
 
 func TestVMessKCP(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	tcpServer := tcp.Server{
 		MsgProcessor: xor,
 	}
 	dest, err := tcpServer.Start()
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 	defer tcpServer.Close()
 
 	userID := protocol.NewID(uuid.New())
@@ -762,7 +762,7 @@ func TestVMessKCP(t *testing.T) {
 	}
 
 	servers, err := InitializeServerConfigs(serverConfig, clientConfig)
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	var wg sync.WaitGroup
 	for i := 0; i < 10; i++ {
@@ -772,18 +772,18 @@ func TestVMessKCP(t *testing.T) {
 				IP:   []byte{127, 0, 0, 1},
 				Port: int(clientPort),
 			})
-			assert.Error(err).IsNil()
+			assert(err, IsNil)
 
 			payload := make([]byte, 10240*1024)
 			rand.Read(payload)
 
 			nBytes, err := conn.Write(payload)
-			assert.Error(err).IsNil()
-			assert.Int(nBytes).Equals(len(payload))
+			assert(err, IsNil)
+			assert(nBytes, Equals, len(payload))
 
 			response := readFrom(conn, time.Minute, 10240*1024)
-			assert.Bytes(response).Equals(xor(payload))
-			assert.Error(conn.Close()).IsNil()
+			assert(response, Equals, xor(payload))
+			assert(conn.Close(), IsNil)
 			wg.Done()
 		}()
 	}
@@ -794,14 +794,14 @@ func TestVMessKCP(t *testing.T) {
 
 func TestVMessIPv6(t *testing.T) {
 	t.SkipNow() // No IPv6 on travis-ci.
-	assert := assert.On(t)
+	assert := With(t)
 
 	tcpServer := tcp.Server{
 		MsgProcessor: xor,
 		Listen:       net.LocalHostIPv6,
 	}
 	dest, err := tcpServer.Start()
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 	defer tcpServer.Close()
 
 	userID := protocol.NewID(uuid.New())
@@ -887,36 +887,36 @@ func TestVMessIPv6(t *testing.T) {
 	}
 
 	servers, err := InitializeServerConfigs(serverConfig, clientConfig)
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	conn, err := net.DialTCP("tcp", nil, &net.TCPAddr{
 		IP:   net.LocalHostIPv6.IP(),
 		Port: int(clientPort),
 	})
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	payload := make([]byte, 1024)
 	rand.Read(payload)
 
 	nBytes, err := conn.Write(payload)
-	assert.Error(err).IsNil()
-	assert.Int(nBytes).Equals(len(payload))
+	assert(err, IsNil)
+	assert(nBytes, Equals, len(payload))
 
 	response := readFrom(conn, time.Second*20, 1024)
-	assert.Bytes(response).Equals(xor(payload))
-	assert.Error(conn.Close()).IsNil()
+	assert(response, Equals, xor(payload))
+	assert(conn.Close(), IsNil)
 
 	CloseAllServers(servers)
 }
 
 func TestVMessGCMMux(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	tcpServer := tcp.Server{
 		MsgProcessor: xor,
 	}
 	dest, err := tcpServer.Start()
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 	defer tcpServer.Close()
 
 	userID := protocol.NewID(uuid.New())
@@ -1008,7 +1008,7 @@ func TestVMessGCMMux(t *testing.T) {
 	}
 
 	servers, err := InitializeServerConfigs(serverConfig, clientConfig)
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	for range "abcd" {
 		var wg sync.WaitGroup
@@ -1020,7 +1020,7 @@ func TestVMessGCMMux(t *testing.T) {
 					IP:   []byte{127, 0, 0, 1},
 					Port: int(clientPort),
 				})
-				assert.Error(err).IsNil()
+				assert(err, IsNil)
 
 				payload := make([]byte, 10240)
 				rand.Read(payload)
@@ -1028,12 +1028,12 @@ func TestVMessGCMMux(t *testing.T) {
 				xorpayload := xor(payload)
 
 				nBytes, err := conn.Write(payload)
-				assert.Error(err).IsNil()
-				assert.Int(nBytes).Equals(len(payload))
+				assert(err, IsNil)
+				assert(nBytes, Equals, len(payload))
 
 				response := readFrom(conn, time.Second*20, 10240)
-				assert.Bytes(response).Equals(xorpayload)
-				assert.Error(conn.Close()).IsNil()
+				assert(response, Equals, xorpayload)
+				assert(conn.Close(), IsNil)
 				wg.Done()
 			}()
 		}
@@ -1045,20 +1045,20 @@ func TestVMessGCMMux(t *testing.T) {
 }
 
 func TestVMessGCMMuxUDP(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	tcpServer := tcp.Server{
 		MsgProcessor: xor,
 	}
 	dest, err := tcpServer.Start()
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 	defer tcpServer.Close()
 
 	udpServer := udp.Server{
 		MsgProcessor: xor,
 	}
 	udpDest, err := udpServer.Start()
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 	defer udpServer.Close()
 
 	userID := protocol.NewID(uuid.New())
@@ -1164,7 +1164,7 @@ func TestVMessGCMMuxUDP(t *testing.T) {
 	}
 
 	servers, err := InitializeServerConfigs(serverConfig, clientConfig)
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	for range "abcd" {
 		var wg sync.WaitGroup
@@ -1176,7 +1176,7 @@ func TestVMessGCMMuxUDP(t *testing.T) {
 					IP:   []byte{127, 0, 0, 1},
 					Port: int(clientPort),
 				})
-				assert.Error(err).IsNil()
+				assert(err, IsNil)
 
 				payload := make([]byte, 10240)
 				rand.Read(payload)
@@ -1184,12 +1184,12 @@ func TestVMessGCMMuxUDP(t *testing.T) {
 				xorpayload := xor(payload)
 
 				nBytes, err := conn.Write(payload)
-				assert.Error(err).IsNil()
-				assert.Int(nBytes).Equals(len(payload))
+				assert(err, IsNil)
+				assert(nBytes, Equals, len(payload))
 
 				response := readFrom(conn, time.Second*20, 10240)
-				assert.Bytes(response).Equals(xorpayload)
-				assert.Error(conn.Close()).IsNil()
+				assert(response, Equals, xorpayload)
+				assert(conn.Close(), IsNil)
 				wg.Done()
 			}()
 		}
@@ -1199,7 +1199,7 @@ func TestVMessGCMMuxUDP(t *testing.T) {
 					IP:   []byte{127, 0, 0, 1},
 					Port: int(clientUDPPort),
 				})
-				assert.Error(err).IsNil()
+				assert(err, IsNil)
 
 				conn.SetDeadline(time.Now().Add(time.Second * 10))
 
@@ -1210,20 +1210,20 @@ func TestVMessGCMMuxUDP(t *testing.T) {
 
 				for j := 0; j < 2; j++ {
 					nBytes, _, err := conn.WriteMsgUDP(payload, nil, nil)
-					assert.Error(err).IsNil()
-					assert.Int(nBytes).Equals(len(payload))
+					assert(err, IsNil)
+					assert(nBytes, Equals, len(payload))
 				}
 
 				response := make([]byte, 1024)
 				oob := make([]byte, 16)
 				for j := 0; j < 2; j++ {
 					nBytes, _, _, _, err := conn.ReadMsgUDP(response, oob)
-					assert.Error(err).IsNil()
-					assert.Int(nBytes).Equals(1024)
-					assert.Bytes(response).Equals(xorpayload)
+					assert(err, IsNil)
+					assert(nBytes, Equals, 1024)
+					assert(response, Equals, xorpayload)
 				}
 
-				assert.Error(conn.Close()).IsNil()
+				assert(conn.Close(), IsNil)
 				wg.Done()
 			}()
 		}
diff --git a/transport/internet/dialer_test.go b/transport/internet/dialer_test.go
index deabfbbdc..07ce06096 100644
--- a/transport/internet/dialer_test.go
+++ b/transport/internet/dialer_test.go
@@ -5,21 +5,21 @@ import (
 	"testing"
 
 	"v2ray.com/core/common/net"
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 	"v2ray.com/core/testing/servers/tcp"
 	. "v2ray.com/core/transport/internet"
 )
 
 func TestDialWithLocalAddr(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	server := &tcp.Server{}
 	dest, err := server.Start()
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 	defer server.Close()
 
 	conn, err := DialSystem(context.Background(), net.LocalHostIP, net.TCPDestination(net.LocalHostIP, dest.Port))
-	assert.Error(err).IsNil()
-	assert.String(conn.RemoteAddr().String()).Equals("127.0.0.1:" + dest.Port.String())
+	assert(err, IsNil)
+	assert(conn.RemoteAddr().String(), Equals, "127.0.0.1:" + dest.Port.String())
 	conn.Close()
 }
diff --git a/transport/internet/header_test.go b/transport/internet/header_test.go
index d4a13e4e2..4cfc72ee2 100644
--- a/transport/internet/header_test.go
+++ b/transport/internet/header_test.go
@@ -3,7 +3,7 @@ package internet_test
 import (
 	"testing"
 
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 	. "v2ray.com/core/transport/internet"
 	"v2ray.com/core/transport/internet/headers/noop"
 	"v2ray.com/core/transport/internet/headers/srtp"
@@ -11,17 +11,17 @@ import (
 )
 
 func TestAllHeadersLoadable(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	noopAuth, err := CreatePacketHeader((*noop.Config)(nil))
-	assert.Error(err).IsNil()
-	assert.Int(noopAuth.Size()).Equals(0)
+	assert(err, IsNil)
+	assert(noopAuth.Size(), Equals, 0)
 
 	srtp, err := CreatePacketHeader((*srtp.Config)(nil))
-	assert.Error(err).IsNil()
-	assert.Int(srtp.Size()).Equals(4)
+	assert(err, IsNil)
+	assert(srtp.Size(), Equals, 4)
 
 	utp, err := CreatePacketHeader((*utp.Config)(nil))
-	assert.Error(err).IsNil()
-	assert.Int(utp.Size()).Equals(4)
+	assert(err, IsNil)
+	assert(utp.Size(), Equals, 4)
 }
diff --git a/transport/internet/headers/http/http_test.go b/transport/internet/headers/http/http_test.go
index 6b805e12a..37a990d28 100644
--- a/transport/internet/headers/http/http_test.go
+++ b/transport/internet/headers/http/http_test.go
@@ -8,31 +8,31 @@ import (
 	"v2ray.com/core/common/buf"
 	"v2ray.com/core/common/net"
 	"v2ray.com/core/common/serial"
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 	. "v2ray.com/core/transport/internet/headers/http"
 )
 
 func TestReaderWriter(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	cache := buf.New()
 	b := buf.NewLocal(256)
 	b.AppendSupplier(serial.WriteString("abcd" + ENDING))
 	writer := NewHeaderWriter(b)
 	err := writer.Write(cache)
-	assert.Error(err).IsNil()
-	assert.Int(cache.Len()).Equals(8)
+	assert(err, IsNil)
+	assert(cache.Len(), Equals, 8)
 	_, err = cache.Write([]byte{'e', 'f', 'g'})
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	reader := &HeaderReader{}
 	buffer, err := reader.Read(cache)
-	assert.Error(err).IsNil()
-	assert.Bytes(buffer.Bytes()).Equals([]byte{'e', 'f', 'g'})
+	assert(err, IsNil)
+	assert(buffer.Bytes(), Equals, []byte{'e', 'f', 'g'})
 }
 
 func TestRequestHeader(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	auth, err := NewHttpAuthenticator(context.Background(), &Config{
 		Request: &RequestConfig{
@@ -45,39 +45,39 @@ func TestRequestHeader(t *testing.T) {
 			},
 		},
 	})
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	cache := buf.New()
 	err = auth.GetClientWriter().Write(cache)
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
-	assert.String(cache.String()).Equals("GET / HTTP/1.1\r\nTest: Value\r\n\r\n")
+	assert(cache.String(), Equals, "GET / HTTP/1.1\r\nTest: Value\r\n\r\n")
 }
 
 func TestConnection(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	auth, err := NewHttpAuthenticator(context.Background(), new(Config))
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	listener, err := net.Listen("tcp", "127.0.0.1:0")
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	go func() {
 		conn, err := listener.Accept()
-		assert.Error(err).IsNil()
+		assert(err, IsNil)
 		authConn := auth.Server(conn)
 		b := make([]byte, 256)
 		for {
 			n, err := authConn.Read(b)
-			assert.Error(err).IsNil()
+			assert(err, IsNil)
 			_, err = authConn.Write(b[:n])
-			assert.Error(err).IsNil()
+			assert(err, IsNil)
 		}
 	}()
 
 	conn, err := net.DialTCP("tcp", nil, listener.Addr().(*net.TCPAddr))
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	authConn := auth.Client(conn)
 	authConn.Write([]byte("Test payload"))
@@ -89,12 +89,12 @@ func TestConnection(t *testing.T) {
 	totalBytes := 0
 	for {
 		n, err := authConn.Read(actualResponse[totalBytes:])
-		assert.Error(err).IsNil()
+		assert(err, IsNil)
 		totalBytes += n
 		if totalBytes >= len(expectedResponse) || time.Now().After(deadline) {
 			break
 		}
 	}
 
-	assert.String(string(actualResponse[:totalBytes])).Equals(expectedResponse)
+	assert(string(actualResponse[:totalBytes]), Equals, expectedResponse)
 }
diff --git a/transport/internet/headers/srtp/srtp_test.go b/transport/internet/headers/srtp/srtp_test.go
index f0e0be2ba..4417e1c7e 100644
--- a/transport/internet/headers/srtp/srtp_test.go
+++ b/transport/internet/headers/srtp/srtp_test.go
@@ -4,12 +4,12 @@ import (
 	"testing"
 
 	"v2ray.com/core/common/buf"
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 	. "v2ray.com/core/transport/internet/headers/srtp"
 )
 
 func TestSRTPWrite(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	content := []byte{'a', 'b', 'c', 'd', 'e', 'f', 'g'}
 	srtp := SRTP{}
@@ -18,5 +18,5 @@ func TestSRTPWrite(t *testing.T) {
 	payload.AppendSupplier(srtp.Write)
 	payload.Append(content)
 
-	assert.Int(payload.Len()).Equals(len(content) + srtp.Size())
+	assert(payload.Len(), Equals, len(content) + srtp.Size())
 }
diff --git a/transport/internet/headers/utp/utp_test.go b/transport/internet/headers/utp/utp_test.go
index 3faa3bbcd..06760db3d 100644
--- a/transport/internet/headers/utp/utp_test.go
+++ b/transport/internet/headers/utp/utp_test.go
@@ -4,12 +4,12 @@ import (
 	"testing"
 
 	"v2ray.com/core/common/buf"
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 	. "v2ray.com/core/transport/internet/headers/utp"
 )
 
 func TestUTPWrite(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	content := []byte{'a', 'b', 'c', 'd', 'e', 'f', 'g'}
 	utp := UTP{}
@@ -18,5 +18,5 @@ func TestUTPWrite(t *testing.T) {
 	payload.AppendSupplier(utp.Write)
 	payload.Append(content)
 
-	assert.Int(payload.Len()).Equals(len(content) + utp.Size())
+	assert(payload.Len(), Equals, len(content) + utp.Size())
 }
diff --git a/transport/internet/headers/wechat/wechat_test.go b/transport/internet/headers/wechat/wechat_test.go
index 5bdaa04fc..e3e840eaf 100644
--- a/transport/internet/headers/wechat/wechat_test.go
+++ b/transport/internet/headers/wechat/wechat_test.go
@@ -4,17 +4,17 @@ import (
 	"testing"
 
 	"v2ray.com/core/common/buf"
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 	. "v2ray.com/core/transport/internet/headers/wechat"
 )
 
 func TestUTPWrite(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	video := VideoChat{}
 
 	payload := buf.NewLocal(2048)
 	payload.AppendSupplier(video.Write)
 
-	assert.Int(payload.Len()).Equals(video.Size())
+	assert(payload.Len(), Equals, video.Size())
 }
diff --git a/transport/internet/kcp/connection_test.go b/transport/internet/kcp/connection_test.go
index 231f6e325..786c320c2 100644
--- a/transport/internet/kcp/connection_test.go
+++ b/transport/internet/kcp/connection_test.go
@@ -5,7 +5,7 @@ import (
 	"testing"
 	"time"
 
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 	. "v2ray.com/core/transport/internet/kcp"
 )
 
@@ -51,15 +51,15 @@ func (o *NoOpConn) SetWriteDeadline(time.Time) error {
 func (o *NoOpConn) Reset(input func([]Segment)) {}
 
 func TestConnectionReadTimeout(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	conn := NewConnection(1, &NoOpConn{}, &Config{})
 	conn.SetReadDeadline(time.Now().Add(time.Second))
 
 	b := make([]byte, 1024)
 	nBytes, err := conn.Read(b)
-	assert.Int(nBytes).Equals(0)
-	assert.Error(err).IsNotNil()
+	assert(nBytes, Equals, 0)
+	assert(err, IsNotNil)
 
 	conn.Terminate()
 }
diff --git a/transport/internet/kcp/crypt_test.go b/transport/internet/kcp/crypt_test.go
index 47ddc7b52..524170766 100644
--- a/transport/internet/kcp/crypt_test.go
+++ b/transport/internet/kcp/crypt_test.go
@@ -3,12 +3,12 @@ package kcp_test
 import (
 	"testing"
 
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 	. "v2ray.com/core/transport/internet/kcp"
 )
 
 func TestSimpleAuthenticator(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	cache := make([]byte, 512)
 
@@ -17,12 +17,12 @@ func TestSimpleAuthenticator(t *testing.T) {
 	auth := NewSimpleAuthenticator()
 	b := auth.Seal(cache[:0], nil, payload, nil)
 	c, err := auth.Open(cache[:0], nil, b, nil)
-	assert.Error(err).IsNil()
-	assert.Bytes(c).Equals(payload)
+	assert(err, IsNil)
+	assert(c, Equals, payload)
 }
 
 func TestSimpleAuthenticator2(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	cache := make([]byte, 512)
 
@@ -31,6 +31,6 @@ func TestSimpleAuthenticator2(t *testing.T) {
 	auth := NewSimpleAuthenticator()
 	b := auth.Seal(cache[:0], nil, payload, nil)
 	c, err := auth.Open(cache[:0], nil, b, nil)
-	assert.Error(err).IsNil()
-	assert.Bytes(c).Equals(payload)
+	assert(err, IsNil)
+	assert(c, Equals, payload)
 }
diff --git a/transport/internet/kcp/kcp_test.go b/transport/internet/kcp/kcp_test.go
index 6658d2606..1d6dadd78 100644
--- a/transport/internet/kcp/kcp_test.go
+++ b/transport/internet/kcp/kcp_test.go
@@ -9,13 +9,13 @@ import (
 	"time"
 
 	"v2ray.com/core/common/net"
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 	"v2ray.com/core/transport/internet"
 	. "v2ray.com/core/transport/internet/kcp"
 )
 
 func TestDialAndListen(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	listerner, err := NewListener(internet.ContextWithTransportSettings(context.Background(), &Config{}), net.LocalHostIP, net.Port(0), func(ctx context.Context, conn internet.Connection) bool {
 		go func(c internet.Connection) {
@@ -34,14 +34,14 @@ func TestDialAndListen(t *testing.T) {
 		}(conn)
 		return true
 	})
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 	port := net.Port(listerner.Addr().(*net.UDPAddr).Port)
 
 	ctx := internet.ContextWithTransportSettings(context.Background(), &Config{})
 	wg := new(sync.WaitGroup)
 	for i := 0; i < 10; i++ {
 		clientConn, err := DialKCP(ctx, net.UDPDestination(net.LocalHostIP, port))
-		assert.Error(err).IsNil()
+		assert(err, IsNil)
 		wg.Add(1)
 
 		go func() {
@@ -51,14 +51,14 @@ func TestDialAndListen(t *testing.T) {
 
 			clientReceived := make([]byte, 1024*1024)
 			nBytes, _ := io.ReadFull(clientConn, clientReceived)
-			assert.Int(nBytes).Equals(len(clientReceived))
+			assert(nBytes, Equals, len(clientReceived))
 			clientConn.Close()
 
 			clientExpected := make([]byte, 1024*1024)
 			for idx, b := range clientSend {
 				clientExpected[idx] = b ^ 'c'
 			}
-			assert.Bytes(clientReceived).Equals(clientExpected)
+			assert(clientReceived, Equals, clientExpected)
 
 			wg.Done()
 		}()
@@ -68,7 +68,7 @@ func TestDialAndListen(t *testing.T) {
 	for i := 0; i < 60 && listerner.ActiveConnections() > 0; i++ {
 		time.Sleep(500 * time.Millisecond)
 	}
-	assert.Int(listerner.ActiveConnections()).Equals(0)
+	assert(listerner.ActiveConnections(), Equals, 0)
 
 	listerner.Close()
 }
diff --git a/transport/internet/kcp/receiving_test.go b/transport/internet/kcp/receiving_test.go
index ca12143b2..21cf2c8f0 100644
--- a/transport/internet/kcp/receiving_test.go
+++ b/transport/internet/kcp/receiving_test.go
@@ -3,12 +3,12 @@ package kcp_test
 import (
 	"testing"
 
-	"v2ray.com/core/testing/assert"
 	. "v2ray.com/core/transport/internet/kcp"
+	. "v2ray.com/ext/assert"
 )
 
 func TestRecivingWindow(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	window := NewReceivingWindow(3)
 
@@ -17,20 +17,18 @@ func TestRecivingWindow(t *testing.T) {
 	seg2 := &DataSegment{}
 	seg3 := &DataSegment{}
 
-	assert.Bool(window.Set(0, seg0)).IsTrue()
-	assert.Pointer(window.RemoveFirst()).Equals(seg0)
+	assert(window.Set(0, seg0), IsTrue)
+	assert(window.RemoveFirst(), Equals, seg0)
 	e := window.RemoveFirst()
-	if e != nil {
-		assert.Fail("Expecting nil.")
-	}
+	assert(e, IsNil)
 
-	assert.Bool(window.Set(1, seg1)).IsTrue()
-	assert.Bool(window.Set(2, seg2)).IsTrue()
+	assert(window.Set(1, seg1), IsTrue)
+	assert(window.Set(2, seg2), IsTrue)
 
 	window.Advance()
-	assert.Bool(window.Set(2, seg3)).IsTrue()
+	assert(window.Set(2, seg3), IsTrue)
 
-	assert.Pointer(window.RemoveFirst()).Equals(seg1)
-	assert.Pointer(window.Remove(1)).Equals(seg2)
-	assert.Pointer(window.Remove(2)).Equals(seg3)
+	assert(window.RemoveFirst(), Equals, seg1)
+	assert(window.Remove(1), Equals, seg2)
+	assert(window.Remove(2), Equals, seg3)
 }
diff --git a/transport/internet/kcp/segment_test.go b/transport/internet/kcp/segment_test.go
index c573c1596..13247692b 100644
--- a/transport/internet/kcp/segment_test.go
+++ b/transport/internet/kcp/segment_test.go
@@ -4,20 +4,20 @@ import (
 	"testing"
 
 	"v2ray.com/core/common/buf"
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 	. "v2ray.com/core/transport/internet/kcp"
 )
 
 func TestBadSegment(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	seg, buf := ReadSegment(nil)
-	assert.Pointer(seg).IsNil()
-	assert.Int(len(buf)).Equals(0)
+	assert(seg, IsNil)
+	assert(len(buf), Equals, 0)
 }
 
 func TestDataSegment(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	b := buf.NewLocal(512)
 	b.Append([]byte{'a', 'b', 'c', 'd'})
@@ -33,19 +33,19 @@ func TestDataSegment(t *testing.T) {
 	bytes := make([]byte, nBytes)
 	seg.Bytes()(bytes)
 
-	assert.Int(len(bytes)).Equals(nBytes)
+	assert(len(bytes), Equals, nBytes)
 
 	iseg, _ := ReadSegment(bytes)
 	seg2 := iseg.(*DataSegment)
-	assert.Uint16(seg2.Conv).Equals(seg.Conv)
-	assert.Uint32(seg2.Timestamp).Equals(seg.Timestamp)
-	assert.Uint32(seg2.SendingNext).Equals(seg.SendingNext)
-	assert.Uint32(seg2.Number).Equals(seg.Number)
-	assert.Bytes(seg2.Data.Bytes()).Equals(seg.Data.Bytes())
+	assert(seg2.Conv, Equals, seg.Conv)
+	assert(seg2.Timestamp, Equals, seg.Timestamp)
+	assert(seg2.SendingNext, Equals, seg.SendingNext)
+	assert(seg2.Number, Equals, seg.Number)
+	assert(seg2.Data.Bytes(), Equals, seg.Data.Bytes())
 }
 
 func Test1ByteDataSegment(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	b := buf.NewLocal(512)
 	b.AppendBytes('a')
@@ -61,19 +61,19 @@ func Test1ByteDataSegment(t *testing.T) {
 	bytes := make([]byte, nBytes)
 	seg.Bytes()(bytes)
 
-	assert.Int(len(bytes)).Equals(nBytes)
+	assert(len(bytes), Equals, nBytes)
 
 	iseg, _ := ReadSegment(bytes)
 	seg2 := iseg.(*DataSegment)
-	assert.Uint16(seg2.Conv).Equals(seg.Conv)
-	assert.Uint32(seg2.Timestamp).Equals(seg.Timestamp)
-	assert.Uint32(seg2.SendingNext).Equals(seg.SendingNext)
-	assert.Uint32(seg2.Number).Equals(seg.Number)
-	assert.Bytes(seg2.Data.Bytes()).Equals(seg.Data.Bytes())
+	assert(seg2.Conv, Equals, seg.Conv)
+	assert(seg2.Timestamp, Equals, seg.Timestamp)
+	assert(seg2.SendingNext, Equals, seg.SendingNext)
+	assert(seg2.Number, Equals, seg.Number)
+	assert(seg2.Data.Bytes(), Equals, seg.Data.Bytes())
 }
 
 func TestACKSegment(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	seg := &AckSegment{
 		Conv:            1,
@@ -87,22 +87,22 @@ func TestACKSegment(t *testing.T) {
 	bytes := make([]byte, nBytes)
 	seg.Bytes()(bytes)
 
-	assert.Int(len(bytes)).Equals(nBytes)
+	assert(len(bytes), Equals, nBytes)
 
 	iseg, _ := ReadSegment(bytes)
 	seg2 := iseg.(*AckSegment)
-	assert.Uint16(seg2.Conv).Equals(seg.Conv)
-	assert.Uint32(seg2.ReceivingWindow).Equals(seg.ReceivingWindow)
-	assert.Uint32(seg2.ReceivingNext).Equals(seg.ReceivingNext)
-	assert.Int(len(seg2.NumberList)).Equals(len(seg.NumberList))
-	assert.Uint32(seg2.Timestamp).Equals(seg.Timestamp)
+	assert(seg2.Conv, Equals, seg.Conv)
+	assert(seg2.ReceivingWindow, Equals, seg.ReceivingWindow)
+	assert(seg2.ReceivingNext, Equals, seg.ReceivingNext)
+	assert(len(seg2.NumberList), Equals, len(seg.NumberList))
+	assert(seg2.Timestamp, Equals, seg.Timestamp)
 	for i, number := range seg2.NumberList {
-		assert.Uint32(number).Equals(seg.NumberList[i])
+		assert(number, Equals, seg.NumberList[i])
 	}
 }
 
 func TestCmdSegment(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	seg := &CmdOnlySegment{
 		Conv:         1,
@@ -117,14 +117,14 @@ func TestCmdSegment(t *testing.T) {
 	bytes := make([]byte, nBytes)
 	seg.Bytes()(bytes)
 
-	assert.Int(len(bytes)).Equals(nBytes)
+	assert(len(bytes), Equals, nBytes)
 
 	iseg, _ := ReadSegment(bytes)
 	seg2 := iseg.(*CmdOnlySegment)
-	assert.Uint16(seg2.Conv).Equals(seg.Conv)
-	assert.Byte(byte(seg2.Command())).Equals(byte(seg.Command()))
-	assert.Byte(byte(seg2.Option)).Equals(byte(seg.Option))
-	assert.Uint32(seg2.SendingNext).Equals(seg.SendingNext)
-	assert.Uint32(seg2.ReceivinNext).Equals(seg.ReceivinNext)
-	assert.Uint32(seg2.PeerRTO).Equals(seg.PeerRTO)
+	assert(seg2.Conv, Equals, seg.Conv)
+	assert(byte(seg2.Command()), Equals, byte(seg.Command()))
+	assert(byte(seg2.Option), Equals, byte(seg.Option))
+	assert(seg2.SendingNext, Equals, seg.SendingNext)
+	assert(seg2.ReceivinNext, Equals, seg.ReceivinNext)
+	assert(seg2.PeerRTO, Equals, seg.PeerRTO)
 }
diff --git a/transport/internet/kcp/sending_test.go b/transport/internet/kcp/sending_test.go
index dfdb99693..d8f689980 100644
--- a/transport/internet/kcp/sending_test.go
+++ b/transport/internet/kcp/sending_test.go
@@ -3,40 +3,40 @@ package kcp_test
 import (
 	"testing"
 
-	"v2ray.com/core/testing/assert"
 	. "v2ray.com/core/transport/internet/kcp"
+	. "v2ray.com/ext/assert"
 )
 
 func TestSendingWindow(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	window := NewSendingWindow(5, nil, nil)
 	window.Push(0, []byte{})
 	window.Push(1, []byte{})
 	window.Push(2, []byte{})
-	assert.Int(window.Len()).Equals(3)
+	assert(window.Len(), Equals, 3)
 
 	window.Remove(1)
-	assert.Int(window.Len()).Equals(3)
-	assert.Uint32(window.FirstNumber()).Equals(0)
+	assert(window.Len(), Equals, 3)
+	assert(window.FirstNumber(), Equals, uint32(0))
 
 	window.Remove(0)
-	assert.Int(window.Len()).Equals(1)
-	assert.Uint32(window.FirstNumber()).Equals(2)
+	assert(window.Len(), Equals, 1)
+	assert(window.FirstNumber(), Equals, uint32(2))
 
 	window.Remove(0)
-	assert.Int(window.Len()).Equals(0)
+	assert(window.Len(), Equals, 0)
 
 	window.Push(4, []byte{})
-	assert.Int(window.Len()).Equals(1)
-	assert.Uint32(window.FirstNumber()).Equals(4)
+	assert(window.Len(), Equals, 1)
+	assert(window.FirstNumber(), Equals, uint32(4))
 
 	window.Push(5, []byte{})
-	assert.Int(window.Len()).Equals(2)
+	assert(window.Len(), Equals, 2)
 
 	window.Remove(1)
-	assert.Int(window.Len()).Equals(2)
+	assert(window.Len(), Equals, 2)
 
 	window.Remove(0)
-	assert.Int(window.Len()).Equals(0)
+	assert(window.Len(), Equals, 0)
 }
diff --git a/transport/internet/tcp/sockopt_linux_test.go b/transport/internet/tcp/sockopt_linux_test.go
index 34e430d8d..bd748824f 100644
--- a/transport/internet/tcp/sockopt_linux_test.go
+++ b/transport/internet/tcp/sockopt_linux_test.go
@@ -7,23 +7,23 @@ import (
 	"strings"
 	"testing"
 
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 	"v2ray.com/core/testing/servers/tcp"
 	. "v2ray.com/core/transport/internet/tcp"
 )
 
 func TestGetOriginalDestination(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	tcpServer := tcp.Server{}
 	dest, err := tcpServer.Start()
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 	defer tcpServer.Close()
 
 	conn, err := Dial(context.Background(), dest)
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 	defer conn.Close()
 
 	originalDest, err := GetOriginalDestination(conn)
-	assert.Bool(dest == originalDest || strings.Contains(err.Error(), "failed to call getsockopt"))
+	assert(dest == originalDest || strings.Contains(err.Error(), "failed to call getsockopt"))
 }
diff --git a/transport/internet/udp/dispatcher_test.go b/transport/internet/udp/dispatcher_test.go
index 5f44b53e7..b780ab16a 100644
--- a/transport/internet/udp/dispatcher_test.go
+++ b/transport/internet/udp/dispatcher_test.go
@@ -8,9 +8,9 @@ import (
 
 	"v2ray.com/core/common/buf"
 	"v2ray.com/core/common/net"
-	"v2ray.com/core/testing/assert"
 	. "v2ray.com/core/transport/internet/udp"
 	"v2ray.com/core/transport/ray"
+	. "v2ray.com/ext/assert"
 )
 
 type TestDispatcher struct {
@@ -22,7 +22,7 @@ func (d *TestDispatcher) Dispatch(ctx context.Context, dest net.Destination) (ra
 }
 
 func TestSameDestinationDispatching(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	ctx, cancel := context.WithCancel(context.Background())
 	link := ray.NewRay(ctx)
@@ -33,7 +33,7 @@ func TestSameDestinationDispatching(t *testing.T) {
 				break
 			}
 			err = link.OutboundOutput().Write(data)
-			assert.Error(err).IsNil()
+			assert(err, IsNil)
 		}
 	}()
 
@@ -60,6 +60,6 @@ func TestSameDestinationDispatching(t *testing.T) {
 	time.Sleep(time.Second)
 	cancel()
 
-	assert.Uint32(count).Equals(1)
-	assert.Uint32(msgCount).Equals(6)
+	assert(count, Equals, uint32(1))
+	assert(msgCount, Equals, uint32(6))
 }
diff --git a/transport/internet/websocket/ws_test.go b/transport/internet/websocket/ws_test.go
index c90161c1c..ac97fbf89 100644
--- a/transport/internet/websocket/ws_test.go
+++ b/transport/internet/websocket/ws_test.go
@@ -7,15 +7,15 @@ import (
 	"time"
 
 	"v2ray.com/core/common/net"
-	"v2ray.com/core/testing/assert"
 	tlsgen "v2ray.com/core/testing/tls"
 	"v2ray.com/core/transport/internet"
 	v2tls "v2ray.com/core/transport/internet/tls"
 	. "v2ray.com/core/transport/internet/websocket"
+	. "v2ray.com/ext/assert"
 )
 
 func Test_listenWSAndDial(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 	listen, err := ListenWS(internet.ContextWithTransportSettings(context.Background(), &Config{
 		Path: "ws",
 	}), net.DomainAddress("localhost"), 13146, func(ctx context.Context, conn internet.Connection) bool {
@@ -24,60 +24,58 @@ func Test_listenWSAndDial(t *testing.T) {
 
 			var b [1024]byte
 			n, err := c.Read(b[:])
-			//assert.Error(err).IsNil()
+			//assert(err, IsNil)
 			if err != nil {
 				return
 			}
-			assert.Bool(bytes.HasPrefix(b[:n], []byte("Test connection"))).IsTrue()
+			assert(bytes.HasPrefix(b[:n], []byte("Test connection")), IsTrue)
 
 			_, err = c.Write([]byte("Response"))
-			assert.Error(err).IsNil()
+			assert(err, IsNil)
 		}(conn)
 		return true
 	})
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	ctx := internet.ContextWithTransportSettings(context.Background(), &Config{Path: "ws"})
 	conn, err := Dial(ctx, net.TCPDestination(net.DomainAddress("localhost"), 13146))
 
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 	_, err = conn.Write([]byte("Test connection 1"))
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	var b [1024]byte
 	n, err := conn.Read(b[:])
-	assert.Error(err).IsNil()
-	assert.String(string(b[:n])).Equals("Response")
+	assert(err, IsNil)
+	assert(string(b[:n]), Equals, "Response")
 
-	assert.Error(conn.Close()).IsNil()
+	assert(conn.Close(), IsNil)
 	<-time.After(time.Second * 5)
 	conn, err = Dial(ctx, net.TCPDestination(net.DomainAddress("localhost"), 13146))
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 	_, err = conn.Write([]byte("Test connection 2"))
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 	n, err = conn.Read(b[:])
-	assert.Error(err).IsNil()
-	assert.String(string(b[:n])).Equals("Response")
-	assert.Error(conn.Close()).IsNil()
+	assert(err, IsNil)
+	assert(string(b[:n]), Equals, "Response")
+	assert(conn.Close(), IsNil)
 	<-time.After(time.Second * 15)
 	conn, err = Dial(ctx, net.TCPDestination(net.DomainAddress("localhost"), 13146))
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 	_, err = conn.Write([]byte("Test connection 3"))
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 	n, err = conn.Read(b[:])
-	assert.Error(err).IsNil()
-	assert.String(string(b[:n])).Equals("Response")
-	assert.Error(conn.Close()).IsNil()
+	assert(err, IsNil)
+	assert(string(b[:n]), Equals, "Response")
+	assert(conn.Close(), IsNil)
 
-	assert.Error(listen.Close()).IsNil()
+	assert(listen.Close(), IsNil)
 }
 
 func Test_listenWSAndDial_TLS(t *testing.T) {
-	assert := assert.On(t)
-	go func() {
-		<-time.After(time.Second * 5)
-		assert.Fail("Too slow")
-	}()
+	assert := With(t)
+
+	start := time.Now()
 
 	ctx := internet.ContextWithTransportSettings(context.Background(), &Config{
 		Path: "wss",
@@ -92,10 +90,13 @@ func Test_listenWSAndDial_TLS(t *testing.T) {
 		}()
 		return true
 	})
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 	defer listen.Close()
 
 	conn, err := Dial(ctx, net.TCPDestination(net.DomainAddress("localhost"), 13143))
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 	_ = conn.Close()
+
+	end := time.Now()
+	assert(end.Before(start.Add(time.Second*5)), IsTrue)
 }
diff --git a/transport/ray/direct_test.go b/transport/ray/direct_test.go
index 20d0d443f..6a16296c1 100644
--- a/transport/ray/direct_test.go
+++ b/transport/ray/direct_test.go
@@ -6,44 +6,44 @@ import (
 	"testing"
 
 	"v2ray.com/core/common/buf"
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 	. "v2ray.com/core/transport/ray"
 )
 
 func TestStreamIO(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	stream := NewStream(context.Background())
 	b1 := buf.New()
 	b1.AppendBytes('a')
-	assert.Error(stream.Write(buf.NewMultiBufferValue(b1))).IsNil()
+	assert(stream.Write(buf.NewMultiBufferValue(b1)), IsNil)
 
 	_, err := stream.Read()
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	stream.Close()
 	_, err = stream.Read()
-	assert.Error(err).Equals(io.EOF)
+	assert(err, Equals, io.EOF)
 
 	b2 := buf.New()
 	b2.AppendBytes('b')
 	err = stream.Write(buf.NewMultiBufferValue(b2))
-	assert.Error(err).Equals(io.ErrClosedPipe)
+	assert(err, Equals, io.ErrClosedPipe)
 }
 
 func TestStreamClose(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	stream := NewStream(context.Background())
 	b1 := buf.New()
 	b1.AppendBytes('a')
-	assert.Error(stream.Write(buf.NewMultiBufferValue(b1))).IsNil()
+	assert(stream.Write(buf.NewMultiBufferValue(b1)), IsNil)
 
 	stream.Close()
 
 	_, err := stream.Read()
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	_, err = stream.Read()
-	assert.Error(err).Equals(io.EOF)
+	assert(err, Equals, io.EOF)
 }
diff --git a/v2ray_test.go b/v2ray_test.go
index a78bd6d53..4374340c3 100644
--- a/v2ray_test.go
+++ b/v2ray_test.go
@@ -14,11 +14,11 @@ import (
 	"v2ray.com/core/proxy/dokodemo"
 	"v2ray.com/core/proxy/vmess"
 	"v2ray.com/core/proxy/vmess/outbound"
-	"v2ray.com/core/testing/assert"
+	. "v2ray.com/ext/assert"
 )
 
 func TestV2RayClose(t *testing.T) {
-	assert := assert.On(t)
+	assert := With(t)
 
 	port := net.Port(dice.RollUint16())
 	config := &Config{
@@ -59,7 +59,7 @@ func TestV2RayClose(t *testing.T) {
 	}
 
 	server, err := New(config)
-	assert.Error(err).IsNil()
+	assert(err, IsNil)
 
 	server.Close()
 }