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diff --git a/third_party/libwebrtc/modules/audio_processing/test/conversational_speech/mock_wavreader.h b/third_party/libwebrtc/modules/audio_processing/test/conversational_speech/mock_wavreader.h
new file mode 100644
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+++ b/third_party/libwebrtc/modules/audio_processing/test/conversational_speech/mock_wavreader.h
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+/*
+ *  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.
+ */
+
+#ifndef MODULES_AUDIO_PROCESSING_TEST_CONVERSATIONAL_SPEECH_MOCK_WAVREADER_H_
+#define MODULES_AUDIO_PROCESSING_TEST_CONVERSATIONAL_SPEECH_MOCK_WAVREADER_H_
+
+#include <cstddef>
+#include <string>
+
+#include "api/array_view.h"
+#include "modules/audio_processing/test/conversational_speech/wavreader_interface.h"
+#include "test/gmock.h"
+
+namespace webrtc {
+namespace test {
+namespace conversational_speech {
+
+class MockWavReader : public WavReaderInterface {
+ public:
+  MockWavReader(int sample_rate, size_t num_channels, size_t num_samples);
+  ~MockWavReader();
+
+  // TODO(alessiob): use ON_CALL to return random samples if needed.
+  MOCK_METHOD(size_t, ReadFloatSamples, (rtc::ArrayView<float>), (override));
+  MOCK_METHOD(size_t, ReadInt16Samples, (rtc::ArrayView<int16_t>), (override));
+
+  MOCK_METHOD(int, SampleRate, (), (const, override));
+  MOCK_METHOD(size_t, NumChannels, (), (const, override));
+  MOCK_METHOD(size_t, NumSamples, (), (const, override));
+
+ private:
+  const int sample_rate_;
+  const size_t num_channels_;
+  const size_t num_samples_;
+};
+
+}  // namespace conversational_speech
+}  // namespace test
+}  // namespace webrtc
+
+#endif  // MODULES_AUDIO_PROCESSING_TEST_CONVERSATIONAL_SPEECH_MOCK_WAVREADER_H_