diff --git a/packager/media/base/media_handler_test_base.cc b/packager/media/base/media_handler_test_base.cc
index f6997ec196..8ff42c4c90 100644
--- a/packager/media/base/media_handler_test_base.cc
+++ b/packager/media/base/media_handler_test_base.cc
@@ -59,6 +59,33 @@ const uint8_t kData[]{
 namespace shaka {
 namespace media {
 
+bool FakeInputMediaHandler::ValidateOutputStreamIndex(size_t index) const {
+  return true;
+}
+
+Status FakeInputMediaHandler::InitializeInternal() {
+  return Status::OK;
+}
+
+Status FakeInputMediaHandler::Process(std::unique_ptr<StreamData> stream_data) {
+  return Status::OK;
+}
+
+Status MockOutputMediaHandler::InitializeInternal() {
+  return Status::OK;
+}
+
+Status MockOutputMediaHandler::Process(
+    std::unique_ptr<StreamData> stream_data) {
+  OnProcess(stream_data.get());
+  return Status::OK;
+}
+
+Status MockOutputMediaHandler::OnFlushRequest(size_t index) {
+  OnFlush(index);
+  return Status::OK;
+}
+
 Status FakeMediaHandler::InitializeInternal() {
   return Status::OK;
 }
diff --git a/packager/media/base/media_handler_test_base.h b/packager/media/base/media_handler_test_base.h
index daedcc5b15..c7d432cd9e 100644
--- a/packager/media/base/media_handler_test_base.h
+++ b/packager/media/base/media_handler_test_base.h
@@ -74,6 +74,29 @@ MATCHER_P4(IsMediaSample, stream_index, timestamp, duration, encrypted, "") {
          arg->media_sample->is_encrypted() == encrypted;
 }
 
+class FakeInputMediaHandler : public MediaHandler {
+ public:
+  using MediaHandler::Dispatch;
+  using MediaHandler::FlushAllDownstreams;
+  using MediaHandler::FlushDownstream;
+
+ private:
+  bool ValidateOutputStreamIndex(size_t index) const override;
+  Status InitializeInternal() override;
+  Status Process(std::unique_ptr<StreamData> stream_data) override;
+};
+
+class MockOutputMediaHandler : public MediaHandler {
+ public:
+  MOCK_METHOD1(OnProcess, void(const StreamData*));
+  MOCK_METHOD1(OnFlush, void(size_t index));
+
+ private:
+  Status InitializeInternal() override;
+  Status Process(std::unique_ptr<StreamData> stream_data) override;
+  Status OnFlushRequest(size_t index) override;
+};
+
 // A fake media handler definition used for testing.
 class FakeMediaHandler : public MediaHandler {
  public: