diff --git a/app/dispatcher/impl/sniffer_test.go b/app/dispatcher/impl/sniffer_test.go
index ce252de4..9ae7eac8 100644
--- a/app/dispatcher/impl/sniffer_test.go
+++ b/app/dispatcher/impl/sniffer_test.go
@@ -3,6 +3,8 @@ package impl_test
 import (
 	"testing"
 
+	"v2ray.com/core/app/proxyman"
+
 	. "v2ray.com/core/app/dispatcher/impl"
 	. "v2ray.com/ext/assert"
 )
@@ -184,3 +186,9 @@ func TestTLSHeaders(t *testing.T) {
 		assert(err, Equals, test.err)
 	}
 }
+
+func TestUnknownSniffer(t *testing.T) {
+	assert := With(t)
+
+	assert(func() { NewSniffer([]proxyman.KnownProtocols{proxyman.KnownProtocols(-1)}) }, Panics)
+}
diff --git a/common/net/address_test.go b/common/net/address_test.go
index 2e8715c3..9c2ab9c8 100644
--- a/common/net/address_test.go
+++ b/common/net/address_test.go
@@ -85,3 +85,19 @@ func TestParseIPv6Address(t *testing.T) {
 	assert(ip, IsIPv4)
 	assert(ip.String(), Equals, "123.151.71.143")
 }
+
+func TestInvalidAddressConvertion(t *testing.T) {
+	assert := With(t)
+
+	assert(func() { ParseAddress("8.8.8.8").Domain() }, Panics)
+	assert(func() { ParseAddress("2001:4860:0:2001::68").Domain() }, Panics)
+	assert(func() { ParseAddress("v2ray.com").IP() }, Panics)
+}
+
+func TestIPOrDomain(t *testing.T) {
+	assert := With(t)
+
+	assert(NewIPOrDomain(ParseAddress("v2ray.com")).AsAddress(), Equals, ParseAddress("v2ray.com"))
+	assert(NewIPOrDomain(ParseAddress("8.8.8.8")).AsAddress(), Equals, ParseAddress("8.8.8.8"))
+	assert(NewIPOrDomain(ParseAddress("2001:4860:0:2001::68")).AsAddress(), Equals, ParseAddress("2001:4860:0:2001::68"))
+}