Selectable number of TL screenshare loopback test

webrtc/modules/video_coding/codecs/vp8/screenshare_layers_unittest.cc

 /*
  *  Copyright (c) 2013 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 94 matching lines @@
 };
 
 TEST_F(ScreenshareLayerTest, 1Layer) {
   layers_.reset(new ScreenshareLayers(1, 0));
   ConfigureBitrates();
   int flags = 0;
   uint32_t timestamp = 0;
   CodecSpecificInfoVP8 vp8_info;
   // One layer screenshare should not use the frame dropper as all frames will
   // belong to the base layer.
+  const int kSingleLayerFlags = 0;
   flags = layers_->EncodeFlags(timestamp);
-  EXPECT_EQ(0, flags);
+  EXPECT_EQ(kSingleLayerFlags, flags);
   layers_->PopulateCodecSpecific(false, &vp8_info, timestamp);
   EXPECT_EQ(static_cast<uint8_t>(kNoTemporalIdx), vp8_info.temporalIdx);
   EXPECT_FALSE(vp8_info.layerSync);
   EXPECT_EQ(kNoTl0PicIdx, vp8_info.tl0PicIdx);
   layers_->FrameEncoded(frame_size_, timestamp, kDefaultQp);
   flags = layers_->EncodeFlags(timestamp);
-  EXPECT_EQ(0, flags);
+  EXPECT_EQ(kSingleLayerFlags, flags);
   timestamp += kTimestampDelta5Fps;
   layers_->PopulateCodecSpecific(false, &vp8_info, timestamp);
   EXPECT_EQ(static_cast<uint8_t>(kNoTemporalIdx), vp8_info.temporalIdx);
   EXPECT_FALSE(vp8_info.layerSync);
   EXPECT_EQ(kNoTl0PicIdx, vp8_info.tl0PicIdx);
   layers_->FrameEncoded(frame_size_, timestamp, kDefaultQp);
 }
 
 TEST_F(ScreenshareLayerTest, 2Layer) {
   layers_.reset(new ScreenshareLayers(2, 0));
@@ skipping 301 matching lines @@
 
   layers_->EncodeFlags(timestamp);
   timestamp += kTimestampDelta5Fps;
   EXPECT_TRUE(layers_->UpdateConfiguration(&cfg));
   layers_->PopulateCodecSpecific(false, &vp8_info, timestamp);
   EXPECT_EQ(cfg.rc_max_quantizer, static_cast<unsigned int>(kDefaultQp));
   layers_->FrameEncoded(frame_size_, timestamp, kDefaultQp);
 }
 
 }  // namespace webrtc