Test usage shown for /sub

tests/test_cmd_sub.c

@@ -29,3 +29,20 @@ void cmd_sub_shows_message_when_not_connected(void **state)
 
     free(help);
 }
+
+void cmd_sub_shows_usage_when_no_arg(void **state)
+{
+    mock_cons_show();
+    CommandHelp *help = malloc(sizeof(CommandHelp));
+    help->usage = "Some usage";
+    gchar *args[] = { NULL };
+
+    mock_connection_status(JABBER_CONNECTED);
+
+    expect_cons_show("Usage: Some usage");
+
+    gboolean result = cmd_sub(args, *help);
+    assert_true(result);
+
+    free(help);
+}

tests/test_cmd_sub.h

@@ -1 +1,2 @@
 void cmd_sub_shows_message_when_not_connected(void **state);
+void cmd_sub_shows_usage_when_no_arg(void **state);

tests/testsuite.c

@@ -255,6 +255,7 @@ int main(int argc, char* argv[]) {
         unit_test(cmd_account_clear_shows_message_when_invalid_property),
 
         unit_test(cmd_sub_shows_message_when_not_connected),
+        unit_test(cmd_sub_shows_usage_when_no_arg),
 
     };
     return run_tests(tests);