Enables VolumeTest.DefaultMicrophoneVolumeIsAtMost255

Rewritten the test to only check for valid volume when we have actually received a value from the audio device. To check if we have actually received a volume value is out of the scope for this test.

BUG=webrtc:367
TESTED=trybots
R=tina.legrand@webrtc.org, xians@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/16499006

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@6123 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/voice_engine/test/auto_test/standard/volume_test.cc b/voice_engine/test/auto_test/standard/volume_test.cc
index efa7b5f..e4a9bd2 100644
--- a/voice_engine/test/auto_test/standard/volume_test.cc
+++ b/voice_engine/test/auto_test/standard/volume_test.cc
@@ -95,10 +95,12 @@
   Sleep(1000);
 }
 
-TEST_F(VolumeTest, DISABLED_ON_LINUX(DefaultMicrophoneVolumeIsAtMost255)) {
+TEST_F(VolumeTest, DefaultMicrophoneVolumeIsAtMost255) {
   unsigned int volume = 1000;
-  EXPECT_EQ(0, voe_volume_control_->GetMicVolume(volume));
-  EXPECT_LE(volume, 255u);
+  if (voe_volume_control_->GetMicVolume(volume) == 0)
+    EXPECT_LE(volume, 255u);
+  else
+    EXPECT_EQ(1000u, volume);
 }
 
 TEST_F(VolumeTest, DISABLED_ON_LINUX(