diff --git a/transport/hub/kcp_test.go b/transport/hub/kcp_test.go
new file mode 100644
index 00000000..30feb80b
--- /dev/null
+++ b/transport/hub/kcp_test.go
@@ -0,0 +1,31 @@
+package hub_test
+
+import "testing"
+
+import (
+	v2net "github.com/v2ray/v2ray-core/common/net"
+	"github.com/v2ray/v2ray-core/testing/assert"
+	"github.com/v2ray/v2ray-core/transport"
+	"github.com/v2ray/v2ray-core/transport/hub"
+	"github.com/v2ray/v2ray-core/transport/hub/kcpv"
+)
+
+func Test_Pair(t *testing.T) {
+	assert := assert.On(t)
+	transport.KcpConfig = &kcpv.Config{}
+	transport.KcpConfig.Mode = "fast2"
+	transport.KcpConfig.Key = "key"
+	transport.KcpConfig.AdvancedConfigs = kcpv.DefaultAdvancedConfigs
+	lst, _ := hub.ListenKCP(v2net.ParseAddress("127.0.0.1"), 17777)
+	go func() {
+		connx, err2 := lst.Accept()
+		assert.Error(err2).IsNil()
+		connx.Close()
+	}()
+	conn, _ := hub.DialKCP(v2net.TCPDestination(v2net.ParseAddress("127.0.0.1"), 17777))
+	conn.LocalAddr()
+	conn.RemoteAddr()
+	conn.ApplyConf()
+	conn.Write([]byte("x"))
+	conn.Close()
+}