diff --git a/api/BUILD.gn b/api/BUILD.gn
index fd27681396..e0c793482a 100644
--- a/api/BUILD.gn
+++ b/api/BUILD.gn
@@ -865,6 +865,17 @@ if (rtc_include_tests) {
     ]
   }
 
+  rtc_source_set("mock_media_stream_interface") {
+    visibility = [ "*" ]
+    testonly = true
+    sources = [ "test/mock_media_stream_interface.h" ]
+
+    deps = [
+      ":media_stream_interface",
+      "../test:test_support",
+    ]
+  }
+
   rtc_source_set("dummy_peer_connection") {
     visibility = [ "*" ]
     testonly = true
@@ -1051,6 +1062,7 @@ if (rtc_include_tests) {
       ":mock_data_channel",
       ":mock_frame_decryptor",
       ":mock_frame_encryptor",
+      ":mock_media_stream_interface",
       ":mock_peer_connection_factory_interface",
       ":mock_peerconnectioninterface",
       ":mock_rtp",
diff --git a/api/test/compile_all_headers.cc b/api/test/compile_all_headers.cc
index 0f50f582cb..76cfc392cc 100644
--- a/api/test/compile_all_headers.cc
+++ b/api/test/compile_all_headers.cc
@@ -34,6 +34,7 @@
 #include "api/test/mock_data_channel.h"
 #include "api/test/mock_frame_decryptor.h"
 #include "api/test/mock_frame_encryptor.h"
+#include "api/test/mock_media_stream_interface.h"
 #include "api/test/mock_peer_connection_factory_interface.h"
 #include "api/test/mock_peerconnectioninterface.h"
 #include "api/test/mock_rtpreceiver.h"
diff --git a/api/test/mock_media_stream_interface.h b/api/test/mock_media_stream_interface.h
new file mode 100644
index 0000000000..29521e6e23
--- /dev/null
+++ b/api/test/mock_media_stream_interface.h
@@ -0,0 +1,89 @@
+/*
+ *  Copyright 2020 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 API_TEST_MOCK_MEDIA_STREAM_INTERFACE_H_
+#define API_TEST_MOCK_MEDIA_STREAM_INTERFACE_H_
+
+#include <string>
+
+#include "api/media_stream_interface.h"
+#include "test/gmock.h"
+
+namespace webrtc {
+
+class MockAudioSource final
+    : public rtc::RefCountedObject<AudioSourceInterface> {
+ public:
+  static rtc::scoped_refptr<MockAudioSource> Create() {
+    return new MockAudioSource();
+  }
+
+  MOCK_METHOD(void,
+              RegisterObserver,
+              (ObserverInterface * observer),
+              (override));
+  MOCK_METHOD(void,
+              UnregisterObserver,
+              (ObserverInterface * observer),
+              (override));
+  MOCK_METHOD(SourceState, state, (), (const, override));
+  MOCK_METHOD(bool, remote, (), (const, override));
+  MOCK_METHOD(void, SetVolume, (double volume), (override));
+  MOCK_METHOD(void,
+              RegisterAudioObserver,
+              (AudioObserver * observer),
+              (override));
+  MOCK_METHOD(void,
+              UnregisterAudioObserver,
+              (AudioObserver * observer),
+              (override));
+  MOCK_METHOD(void, AddSink, (AudioTrackSinkInterface * sink), (override));
+  MOCK_METHOD(void, RemoveSink, (AudioTrackSinkInterface * sink), (override));
+  MOCK_METHOD(const cricket::AudioOptions, options, (), (const, override));
+
+ private:
+  MockAudioSource() = default;
+};
+
+class MockAudioTrack final : public rtc::RefCountedObject<AudioTrackInterface> {
+ public:
+  static rtc::scoped_refptr<MockAudioTrack> Create() {
+    return new MockAudioTrack();
+  }
+
+  MOCK_METHOD(void,
+              RegisterObserver,
+              (ObserverInterface * observer),
+              (override));
+  MOCK_METHOD(void,
+              UnregisterObserver,
+              (ObserverInterface * observer),
+              (override));
+  MOCK_METHOD(std::string, kind, (), (const, override));
+  MOCK_METHOD(std::string, id, (), (const override));
+  MOCK_METHOD(bool, enabled, (), (const, override));
+  MOCK_METHOD(bool, set_enabled, (bool enable), (override));
+  MOCK_METHOD(TrackState, state, (), (const, override));
+  MOCK_METHOD(AudioSourceInterface*, GetSource, (), (const, override));
+  MOCK_METHOD(void, AddSink, (AudioTrackSinkInterface * sink), (override));
+  MOCK_METHOD(void, RemoveSink, (AudioTrackSinkInterface * sink), (override));
+  MOCK_METHOD(bool, GetSignalLevel, (int* level), (override));
+  MOCK_METHOD(rtc::scoped_refptr<AudioProcessorInterface>,
+              GetAudioProcessor,
+              (),
+              (override));
+
+ private:
+  MockAudioTrack() = default;
+};
+
+}  // namespace webrtc
+
+#endif  // API_TEST_MOCK_MEDIA_STREAM_INTERFACE_H_