Added audioSessionDidActivate and audioSessionDidDectivate

webrtc/modules/audio_device/ios/objc/RTCAudioSessionTest.mm

 /*
  *  Copyright 2016 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 158 matching lines @@
 - (void)testRemoveDelegateOnDealloc {
   @autoreleasepool {
     RTCTestRemoveOnDeallocDelegate *delegate =
         [[RTCTestRemoveOnDeallocDelegate alloc] init];
     EXPECT_TRUE(delegate);
   }
   RTCAudioSession *session = [RTCAudioSession sharedInstance];
   EXPECT_EQ(0u, session.delegates.size());
 }
 
+- (void)testAudioSessionActivation {
+  RTCAudioSession *audioSession = [RTCAudioSession sharedInstance];
+  EXPECT_EQ(0, audioSession.activationCount);
+  [audioSession audioSessionDidActivate:[AVAudioSession sharedInstance]];
+  EXPECT_EQ(1, audioSession.activationCount);
+  [audioSession audioSessionDidDeactivate:[AVAudioSession sharedInstance]];
+  EXPECT_EQ(0, audioSession.activationCount);
+}
+
 @end
 
 namespace webrtc {
 
 class AudioSessionTest : public ::testing::Test {
  protected:
   void TearDown() {
     RTCAudioSession *session = [RTCAudioSession sharedInstance];
     for (id<RTCAudioSessionDelegate> delegate : session.delegates) {
       [session removeDelegate:delegate];
@@ skipping 19 matching lines @@
 TEST_F(AudioSessionTest, ZeroingWeakDelegate) {
   RTCAudioSessionTest *test = [[RTCAudioSessionTest alloc] init];
   [test testZeroingWeakDelegate];
 }
 
 TEST_F(AudioSessionTest, RemoveDelegateOnDealloc) {
   RTCAudioSessionTest *test = [[RTCAudioSessionTest alloc] init];
   [test testRemoveDelegateOnDealloc];
 }
 
+TEST_F(AudioSessionTest, AudioSessionActivation) {
+  RTCAudioSessionTest *test = [[RTCAudioSessionTest alloc] init];
+  [test testAudioSessionActivation];
+}
+
+
 }  // namespace webrtc