Disable a11y volume tests for fixed volume devices.

Bug: 111211754
Test: run cts -m CtsAccessibilityServiceTestCases -t
      android.accessibilityservice.cts.AccessibilityVolumeTest
      on fixed volume devices.

Change-Id: Ic458d34b4fed55f222dce481a0e8c6c65af4d181
diff --git a/tests/accessibilityservice/src/android/accessibilityservice/cts/AccessibilityVolumeTest.java b/tests/accessibilityservice/src/android/accessibilityservice/cts/AccessibilityVolumeTest.java
index b53df79..9983699 100644
--- a/tests/accessibilityservice/src/android/accessibilityservice/cts/AccessibilityVolumeTest.java
+++ b/tests/accessibilityservice/src/android/accessibilityservice/cts/AccessibilityVolumeTest.java
@@ -44,10 +44,11 @@
         mInstrumentation = InstrumentationRegistry.getInstrumentation();
         mAudioManager =
                 (AudioManager) mInstrumentation.getContext().getSystemService(AUDIO_SERVICE);
-        // TVs have a single volume
+        // TVs and fixed volume devices have a single volume
         PackageManager pm = mInstrumentation.getContext().getPackageManager();
         mSingleVolume = (pm != null) && (pm.hasSystemFeature(PackageManager.FEATURE_LEANBACK)
-                || pm.hasSystemFeature(PackageManager.FEATURE_TELEVISION));
+                || pm.hasSystemFeature(PackageManager.FEATURE_TELEVISION))
+                || mAudioManager.isVolumeFixed();
     }
 
     @Test