diff --git a/common/mock_excluder.h b/common/mock_excluder.h
new file mode 100644
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--- /dev/null
+++ b/common/mock_excluder.h
@@ -0,0 +1,37 @@
+//
+// Copyright (C) 2020 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+#ifndef UPDATE_ENGINE_MOCK_APP_EXCLUDER_H_
+#define UPDATE_ENGINE_MOCK_APP_EXCLUDER_H_
+
+#include "update_engine/common/excluder_interface.h"
+
+#include <string>
+
+#include <gmock/gmock.h>
+
+namespace chromeos_update_engine {
+
+class MockExcluder : public ExcluderInterface {
+ public:
+  MOCK_METHOD(bool, Exclude, (const std::string&), (override));
+  MOCK_METHOD(bool, IsExcluded, (const std::string&), (override));
+  MOCK_METHOD(bool, Reset, (), (override));
+};
+
+}  // namespace chromeos_update_engine
+
+#endif  // UPDATE_ENGINE_MOCK_APP_EXCLUDER_H_