Finalization of the first version of EchoCanceller 3

webrtc/modules/audio_processing/aec3/echo_path_variability_unittest.cc

Index: webrtc/modules/audio_processing/aec3/echo_path_variability_unittest.cc
diff --git a/webrtc/modules/audio_processing/aec3/echo_path_variability_unittest.cc b/webrtc/modules/audio_processing/aec3/echo_path_variability_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..e2e82d1f97e85431b6b8204716733062e71f6b7c
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+++ b/webrtc/modules/audio_processing/aec3/echo_path_variability_unittest.cc
@@ -0,0 +1,39 @@
+/*
+ *  Copyright (c) 2017 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.
+ */
+
+#include "webrtc/modules/audio_processing/aec3/echo_path_variability.h"
+#include "webrtc/test/gtest.h"
+
+namespace webrtc {
+
+TEST(EchoPathVariability, CorrectBehavior) {
+  // Test correct passing and reporting of the gain change information.
+  EchoPathVariability v(true, true);
+  EXPECT_TRUE(v.gain_change);
+  EXPECT_TRUE(v.delay_change);
+  EXPECT_TRUE(v.AudioPathChanged());
+
+  v = EchoPathVariability(true, false);
+  EXPECT_TRUE(v.gain_change);
+  EXPECT_FALSE(v.delay_change);
+  EXPECT_TRUE(v.AudioPathChanged());
+
+  v = EchoPathVariability(false, true);
+  EXPECT_FALSE(v.gain_change);
+  EXPECT_TRUE(v.delay_change);
+  EXPECT_TRUE(v.AudioPathChanged());
+
+  v = EchoPathVariability(false, false);
+  EXPECT_FALSE(v.gain_change);
+  EXPECT_FALSE(v.delay_change);
+  EXPECT_FALSE(v.AudioPathChanged());
+}
+
+}  // namespace webrtc