Use a channel to safely synchronize datachannel writes, (#12)

clean up ice candidate log message.
still need to debug the copy loop break.

client/client_test.go

@@ -9,10 +9,12 @@ import (
 
 type MockDataChannel struct {
 	destination bytes.Buffer
+	done        chan bool
 }
 
 func (m *MockDataChannel) Send(data []byte) {
 	m.destination.Write(data)
+	m.done <- true
 }
 
 func (*MockDataChannel) Close() error {
@@ -24,6 +26,7 @@ func TestConnect(t *testing.T) {
 
 		Convey("WebRTC Connection", func() {
 			c := new(webRTCConn)
+
 			c.BytesInfo = &BytesInfo{
 				inboundChan: make(chan int), outboundChan: make(chan int),
 				inbound: 0, outbound: 0, inEvents: 0, outEvents: 0,
@@ -31,15 +34,19 @@ func TestConnect(t *testing.T) {
 			So(c.buffer.Bytes(), ShouldEqual, nil)
 
 			Convey("SendData buffers when datachannel is nil", func() {
-				c.sendData([]byte("test"))
+				c.SendData([]byte("test"))
 				c.snowflake = nil
 				So(c.buffer.Bytes(), ShouldResemble, []byte("test"))
 			})
 
 			Convey("SendData sends to datachannel when not nil", func() {
 				mock := new(MockDataChannel)
+				mock.done = make(chan bool)
+				go c.SendLoop()
+				c.writeChannel = make(chan []byte)
 				c.snowflake = mock
-				c.sendData([]byte("test"))
+				c.SendData([]byte("test"))
+				<-mock.done
 				So(c.buffer.Bytes(), ShouldEqual, nil)
 				So(mock.destination.Bytes(), ShouldResemble, []byte("test"))
 			})