package cache_test

import (
	"testing"

	. "github.com/v2fly/v2ray-core/v4/common/cache"
)

func TestLruReplaceValue(t *testing.T) {
	lru := NewLru(2)
	lru.Put(2, 6)
	lru.Put(1, 5)
	lru.Put(1, 2)
	v, _ := lru.Get(1)
	if v != 2 {
		t.Error("should get 2", v)
	}
	v, _ = lru.Get(2)
	if v != 6 {
		t.Error("should get 6", v)
	}
}

func TestLruRemoveOld(t *testing.T) {
	lru := NewLru(2)
	v, ok := lru.Get(2)
	if ok {
		t.Error("should get nil", v)
	}
	lru.Put(1, 1)
	lru.Put(2, 2)
	v, _ = lru.Get(1)
	if v != 1 {
		t.Error("should get 1", v)
	}
	lru.Put(3, 3)
	v, ok = lru.Get(2)
	if ok {
		t.Error("should get nil", v)
	}
	lru.Put(4, 4)
	v, ok = lru.Get(1)
	if ok {
		t.Error("should get nil", v)
	}
	v, _ = lru.Get(3)
	if v != 3 {
		t.Error("should get 3", v)
	}
	v, _ = lru.Get(4)
	if v != 4 {
		t.Error("should get 4", v)
	}
}

func TestGetKeyFromValue(t *testing.T) {
	lru := NewLru(2)
	lru.Put(3, 3)
	lru.Put(2, 2)
	lru.Put(1, 1)
	v, ok := lru.GetKeyFromValue(3)
	if ok {
		t.Error("should get nil", v)
	}
	v, _ = lru.GetKeyFromValue(2)
	if v != 2 {
		t.Error("should get 2", v)
	}
}