Added audioSessionDidActivate and audioSessionDidDectivate

webrtc/sdk/objc/Framework/UnitTests/RTCAudioSessionTest.mm

+/*
+ *  Copyright 2015 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.
+ */
+
+#import <Foundation/Foundation.h>
+
+#include <vector>
+
+#include "webrtc/base/gunit.h"
+
+#import "NSString+StdString.h"
+#import "webrtc/modules/audio_device/ios/objc/RTCAudioSession.h"
+#import "webrtc/modules/audio_device/ios/objc/RTCAudioSession+Private.h"
+#import "webrtc/modules/audio_device/ios/objc/RTCAudioSessionConfiguration.h"
+
+@interface RTCAudioSessionTest : NSObject
+- (void)testAudioSessionActivation;
+@end
+
+@implementation RTCAudioSessionTest
+

[tkchin_webrtc, 2017/04/13 20:17:30]

it'd be nice to have a unit test here that captures the previous scenario in
which we ended up with a negative count

+- (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
+
+TEST(RTCAudioSessionTest, ConfigurationGetterTest) {
+  @autoreleasepool {
+    RTCAudioSessionTest *test = [[RTCAudioSessionTest alloc] init];
+    [test testAudioSessionActivation];
+  }
+}
+
+