diff --git a/api/BUILD.gn b/api/BUILD.gn
index c420b10a41..0727d82dce 100644
--- a/api/BUILD.gn
+++ b/api/BUILD.gn
@@ -517,6 +517,19 @@ if (rtc_include_tests) {
     ]
   }
 
+  rtc_source_set("mock_video_encoder") {
+    testonly = true
+    sources = [
+      "test/mock_video_encoder.cc",
+      "test/mock_video_encoder.h",
+    ]
+
+    deps = [
+      "../api/video_codecs:video_codecs_api",
+      "../test:test_support",
+    ]
+  }
+
   rtc_source_set("rtc_api_unittests") {
     testonly = true
 
diff --git a/api/test/mock_video_encoder.cc b/api/test/mock_video_encoder.cc
new file mode 100644
index 0000000000..a0d82b1c33
--- /dev/null
+++ b/api/test/mock_video_encoder.cc
@@ -0,0 +1,20 @@
+/*
+ *  Copyright (c) 2018 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 "api/test/mock_video_encoder.h"
+
+namespace webrtc {
+
+MockEncodedImageCallback::MockEncodedImageCallback() = default;
+MockEncodedImageCallback::~MockEncodedImageCallback() = default;
+MockVideoEncoder::MockVideoEncoder() = default;
+MockVideoEncoder::~MockVideoEncoder() = default;
+
+}  // namespace webrtc
diff --git a/api/test/mock_video_encoder.h b/api/test/mock_video_encoder.h
new file mode 100644
index 0000000000..e2f0942c25
--- /dev/null
+++ b/api/test/mock_video_encoder.h
@@ -0,0 +1,58 @@
+/*
+ *  Copyright (c) 2018 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_VIDEO_ENCODER_H_
+#define API_TEST_MOCK_VIDEO_ENCODER_H_
+
+#include <vector>
+
+#include "api/video_codecs/video_encoder.h"
+#include "test/gmock.h"
+
+namespace webrtc {
+
+class MockEncodedImageCallback : public EncodedImageCallback {
+ public:
+  MockEncodedImageCallback();
+  ~MockEncodedImageCallback();
+  MOCK_METHOD3(OnEncodedImage,
+               Result(const EncodedImage& encodedImage,
+                      const CodecSpecificInfo* codecSpecificInfo,
+                      const RTPFragmentationHeader* fragmentation));
+};
+
+class MockVideoEncoder : public VideoEncoder {
+ public:
+  MockVideoEncoder();
+  ~MockVideoEncoder();
+  MOCK_CONST_METHOD2(Version, int32_t(int8_t* version, int32_t length));
+  MOCK_METHOD3(InitEncode,
+               int32_t(const VideoCodec* codecSettings,
+                       int32_t numberOfCores,
+                       size_t maxPayloadSize));
+  MOCK_METHOD3(Encode,
+               int32_t(const VideoFrame& inputImage,
+                       const CodecSpecificInfo* codecSpecificInfo,
+                       const std::vector<FrameType>* frame_types));
+  MOCK_METHOD1(RegisterEncodeCompleteCallback,
+               int32_t(EncodedImageCallback* callback));
+  MOCK_METHOD0(Release, int32_t());
+  MOCK_METHOD0(Reset, int32_t());
+  MOCK_METHOD2(SetChannelParameters, int32_t(uint32_t packetLoss, int64_t rtt));
+  MOCK_METHOD2(SetRates, int32_t(uint32_t newBitRate, uint32_t frameRate));
+  MOCK_METHOD2(SetRateAllocation,
+               int32_t(const VideoBitrateAllocation& newBitRate,
+                       uint32_t frameRate));
+  MOCK_CONST_METHOD0(HasTrustedRateController, bool(void));
+};
+
+}  // namespace webrtc
+
+#endif  // API_TEST_MOCK_VIDEO_ENCODER_H_