Fix OnICEGatheringStateChange Signature

Return ICEGatheringState not ICEGathererState

Relates to #2557

Author: Sean-Der

peerconnection.go

@@ -454,8 +454,18 @@ func (pc *PeerConnection) OnICECandidate(f func(*ICECandidate)) {
 
 // OnICEGatheringStateChange sets an event handler which is invoked when the
 // ICE candidate gathering state has changed.
-func (pc *PeerConnection) OnICEGatheringStateChange(f func(ICEGathererState)) {
-	pc.iceGatherer.OnStateChange(f)
+func (pc *PeerConnection) OnICEGatheringStateChange(f func(ICEGatheringState)) {
+	pc.iceGatherer.OnStateChange(
+		func(gathererState ICEGathererState) {
+			switch gathererState {
+			case ICEGathererStateNew:
+				f(ICEGatheringStateNew)
+			case ICEGathererStateGathering:
+				f(ICEGatheringStateGathering)
+			default:
+				f(ICEGatheringStateComplete)
+			}
+		})
 }
 
 // OnTrack sets an event handler which is called when remote track

peerconnection_go_test.go

@@ -619,31 +619,22 @@ func TestOnICEGatheringStateChange(t *testing.T) {
 	seenComplete := &atomicBool{}
 
 	seenGatheringAndComplete := make(chan interface{})
-	seenClosed := make(chan interface{})
 
 	peerConn, err := NewPeerConnection(Configuration{})
 	assert.NoError(t, err)
 
-	var onStateChange func(s ICEGathererState)
-	onStateChange = func(s ICEGathererState) {
+	var onStateChange func(s ICEGatheringState)
+	onStateChange = func(s ICEGatheringState) {
 		// Access to ICEGatherer in the callback must not cause dead lock.
 		peerConn.OnICEGatheringStateChange(onStateChange)
-		if state := peerConn.iceGatherer.State(); state != s {
-			t.Errorf("State change callback argument (%s) and State() (%s) result differs",
-				s, state,
-			)
-		}
 
 		switch s { // nolint:exhaustive
-		case ICEGathererStateClosed:
-			close(seenClosed)
-			return
-		case ICEGathererStateGathering:
+		case ICEGatheringStateGathering:
 			if seenComplete.get() {
 				t.Error("Completed before gathering")
 			}
 			seenGathering.set(true)
-		case ICEGathererStateComplete:
+		case ICEGatheringStateComplete:
 			seenComplete.set(true)
 		}
 
@@ -660,18 +651,10 @@ func TestOnICEGatheringStateChange(t *testing.T) {
 	select {
 	case <-time.After(time.Second * 10):
 		t.Fatal("Gathering and Complete were never seen")
-	case <-seenClosed:
-		t.Fatal("Closed before PeerConnection Close")
 	case <-seenGatheringAndComplete:
 	}
 
 	assert.NoError(t, peerConn.Close())
-
-	select {
-	case <-time.After(time.Second * 10):
-		t.Fatal("Closed was never seen")
-	case <-seenClosed:
-	}
 }
 
 // Assert Trickle ICE behaviors