Clean code and tests

Author: zhiyipanuber

channel.go

@@ -98,6 +98,7 @@ type ChannelOptions struct {
 	// It requires underlying operating system support MPTCP.
 	// If EnableMPTCP is false or no MPTCP support, the connection will use normal TCP.
 	// It's set to false by default.
+	// If a Dialer is passed as option, this value will be ignored.
 	EnableMPTCP bool
 
 	// The reporter to use for reporting stats for this channel.
@@ -414,15 +415,9 @@ func (ch *Channel) ListenAndServe(hostPort string) error {
 		return errAlreadyListening
 	}
 
-	var l net.Listener
-	var err error
-	if ch.enableMPTCP {
-		lc := &net.ListenConfig{}
-		lc.SetMultipathTCP(true)
-		l, err = lc.Listen(context.Background(), "tcp", hostPort)
-	} else {
-		l, err = net.Listen("tcp", hostPort)
-	}
+	lc := net.ListenConfig{}
+	lc.SetMultipathTCP(ch.enableMPTCP)
+	l, err := lc.Listen(context.Background(), "tcp", hostPort)
 	if err != nil {
 		mutable.RUnlock()
 		return err

channel_test.go

@@ -44,24 +44,27 @@ func toMap(fields LogFields) map[string]interface{} {
 }
 
 func TestNewChannel(t *testing.T) {
-	ch, err := NewChannel("svc", &ChannelOptions{
-		ProcessName: "pname",
-	})
-	require.NoError(t, err, "NewChannel failed")
-
-	assert.Equal(t, LocalPeerInfo{
-		ServiceName: "svc",
-		PeerInfo: PeerInfo{
+	for _, mptcp := range []bool{true, false} {
+		ch, err := NewChannel("svc", &ChannelOptions{
 			ProcessName: "pname",
-			HostPort:    ephemeralHostPort,
-			IsEphemeral: true,
-			Version: PeerVersion{
-				Language:        "go",
-				LanguageVersion: strings.TrimPrefix(runtime.Version(), "go"),
-				TChannelVersion: VersionInfo,
+			EnableMPTCP: mptcp,
+		})
+		require.NoError(t, err, "NewChannel failed")
+
+		assert.Equal(t, LocalPeerInfo{
+			ServiceName: "svc",
+			PeerInfo: PeerInfo{
+				ProcessName: "pname",
+				HostPort:    ephemeralHostPort,
+				IsEphemeral: true,
+				Version: PeerVersion{
+					Language:        "go",
+					LanguageVersion: strings.TrimPrefix(runtime.Version(), "go"),
+					TChannelVersion: VersionInfo,
+				},
 			},
-		},
-	}, ch.PeerInfo(), "Wrong local peer info")
+		}, ch.PeerInfo(), "Wrong local peer info")
+	}
 }
 
 func TestNewChannelEnableMPTCP(t *testing.T) {