Disables AudioDeviceTest.StartStopPlayout on iOS

webrtc/modules/audio_device/ios/audio_device_unittest_ios.cc

 /*
  *  Copyright (c) 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.
  */
 
@@ skipping 570 matching lines @@
 
 TEST_F(AudioDeviceTest, InitTerminate) {
   // Initialization is part of the test fixture.
   EXPECT_TRUE(audio_device()->Initialized());
   EXPECT_EQ(0, audio_device()->Terminate());
   EXPECT_FALSE(audio_device()->Initialized());
 }
 
 // Tests that playout can be initiated, started and stopped. No audio callback
 // is registered in this test.
-TEST_F(AudioDeviceTest, StartStopPlayout) {
+// Failing when running on real iOS devices: bugs.webrtc.org/6889.
+TEST_F(AudioDeviceTest, DISABLED_StartStopPlayout) {
   StartPlayout();
   StopPlayout();
   StartPlayout();
   StopPlayout();
 }
 
 // Tests that recording can be initiated, started and stopped. No audio callback
 // is registered in this test.
 TEST_F(AudioDeviceTest, StartStopRecording) {
   StartRecording();
@@ skipping 213 matching lines @@
   StopPlayout();
   StopRecording();
   // Verify that the correct number of transmitted impulses are detected.
   EXPECT_EQ(latency_audio_stream->num_latency_values(),
             static_cast<size_t>(
                 kImpulseFrequencyInHz * kMeasureLatencyTimeInSec - 1));
   latency_audio_stream->PrintResults();
 }
 
 }  // namespace webrtc