Espresso test case to control loopback call

webrtc/examples/androidapp/src/org/appspot/apprtc/CallActivity.java

 /*
  *  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.
  */
 
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     // If capturing format is not specified for screencapture, use screen resolution.
     if (screencaptureEnabled && videoWidth == 0 && videoHeight == 0) {
       DisplayMetrics displayMetrics = new DisplayMetrics();
       WindowManager windowManager =
           (WindowManager) getApplication().getSystemService(Context.WINDOW_SERVICE);
       windowManager.getDefaultDisplay().getRealMetrics(displayMetrics);
       videoWidth = displayMetrics.widthPixels;
       videoHeight = displayMetrics.heightPixels;
     }
     DataChannelParameters dataChannelParameters = null;
-    if (intent.getBooleanExtra(EXTRA_DATA_CHANNEL_ENABLED, true)) {
+    if (intent.getBooleanExtra(EXTRA_DATA_CHANNEL_ENABLED, false)) {
       dataChannelParameters = new DataChannelParameters(intent.getBooleanExtra(EXTRA_ORDERED, true),
           intent.getIntExtra(EXTRA_MAX_RETRANSMITS_MS, -1),
           intent.getIntExtra(EXTRA_MAX_RETRANSMITS, -1), intent.getStringExtra(EXTRA_PROTOCOL),
           intent.getBooleanExtra(EXTRA_NEGOTIATED, false), intent.getIntExtra(EXTRA_ID, -1));
     }
     peerConnectionParameters =
         new PeerConnectionParameters(intent.getBooleanExtra(EXTRA_VIDEO_CALL, true), loopback,
             tracing, videoWidth, videoHeight, intent.getIntExtra(EXTRA_VIDEO_FPS, 0),
             intent.getIntExtra(EXTRA_VIDEO_BITRATE, 0), intent.getStringExtra(EXTRA_VIDEOCODEC),
             intent.getBooleanExtra(EXTRA_HWCODEC_ENABLED, true),
@@ skipping 595 matching lines @@
         }
       }
     });
   }
 
   @Override
   public void onPeerConnectionError(final String description) {
     reportError(description);
   }
 }