diff --git a/common/net/testing/assert.go b/common/net/testing/assert.go
deleted file mode 100644
index b6eb2fb9..00000000
--- a/common/net/testing/assert.go
+++ /dev/null
@@ -1,48 +0,0 @@
-package testing
-
-import (
-	"v2ray.com/core/common/net"
-	"v2ray.com/ext/assert"
-)
-
-var IsIPv4 = assert.CreateMatcher(func(a net.Address) bool {
-	return a.Family().IsIPv4()
-}, "is IPv4")
-
-var IsIPv6 = assert.CreateMatcher(func(a net.Address) bool {
-	return a.Family().IsIPv6()
-}, "is IPv6")
-
-var IsIP = assert.CreateMatcher(func(a net.Address) bool {
-	return a.Family().IsIPv4() || a.Family().IsIPv6()
-}, "is IP")
-
-var IsTCP = assert.CreateMatcher(func(a net.Destination) bool {
-	return a.Network == net.Network_TCP
-}, "is TCP")
-
-var IsUDP = assert.CreateMatcher(func(a net.Destination) bool {
-	return a.Network == net.Network_UDP
-}, "is UDP")
-
-var IsDomain = assert.CreateMatcher(func(a net.Address) bool {
-	return a.Family().IsDomain()
-}, "is Domain")
-
-func init() {
-	assert.RegisterEqualsMatcher(func(a, b net.Address) bool {
-		return a == b
-	})
-
-	assert.RegisterEqualsMatcher(func(a, b net.Destination) bool {
-		return a == b
-	})
-
-	assert.RegisterEqualsMatcher(func(a, b net.Port) bool {
-		return a == b
-	})
-
-	assert.RegisterEqualsMatcher(func(a, b net.IP) bool {
-		return a.Equal(b)
-	})
-}