diff --git a/phosphor-regulators/test/actions/mock_action.hpp b/phosphor-regulators/test/actions/mock_action.hpp
new file mode 100644
index 0000000..2535ef3
--- /dev/null
+++ b/phosphor-regulators/test/actions/mock_action.hpp
@@ -0,0 +1,46 @@
+/**
+ * Copyright © 2019 IBM Corporation
+ *
+ * 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.
+ */
+#pragma once
+
+#include "action.hpp"
+#include "action_environment.hpp"
+
+#include <gmock/gmock.h>
+
+namespace phosphor
+{
+namespace power
+{
+namespace regulators
+{
+
+class MockAction : public Action
+{
+  public:
+    // Specify which compiler-generated methods we want
+    MockAction() = default;
+    MockAction(const MockAction&) = delete;
+    MockAction(MockAction&&) = delete;
+    MockAction& operator=(const MockAction&) = delete;
+    MockAction& operator=(MockAction&&) = delete;
+    virtual ~MockAction() = default;
+
+    MOCK_METHOD(bool, execute, (ActionEnvironment & environment), (override));
+};
+
+} // namespace regulators
+} // namespace power
+} // namespace phosphor
diff --git a/phosphor-regulators/test/actions/stub_action.hpp b/phosphor-regulators/test/actions/stub_action.hpp
deleted file mode 100644
index ea346ba..0000000
--- a/phosphor-regulators/test/actions/stub_action.hpp
+++ /dev/null
@@ -1,153 +0,0 @@
-/**
- * Copyright © 2019 IBM Corporation
- *
- * 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.
- */
-#pragma once
-
-#include "action.hpp"
-#include "action_environment.hpp"
-
-#include <cstddef> // for size_t
-#include <exception>
-#include <memory>
-#include <utility>
-
-namespace phosphor
-{
-namespace power
-{
-namespace regulators
-{
-
-/**
- * @class StubAction
- *
- * Stub action used for unit tests.
- *
- * The action allows you to do one of the following when execute() is called:
- *   - return a predefined return value
- *   - throw an exception
- *
- * The action also tracks the following:
- *   - number of times action has been executed
- *   - number of exceptions thrown
- */
-class StubAction : public Action
-{
-  public:
-    // Specify which compiler-generated methods we want
-    StubAction() = delete;
-    StubAction(const StubAction&) = delete;
-    StubAction(StubAction&&) = delete;
-    StubAction& operator=(const StubAction&) = delete;
-    StubAction& operator=(StubAction&&) = delete;
-    virtual ~StubAction() = default;
-
-    /**
-     * Constructor.
-     *
-     * @param returnValue value to return when execute() is called
-     */
-    explicit StubAction(bool returnValue) : returnValue{returnValue}
-    {
-    }
-
-    /**
-     * Executes this action.
-     *
-     * Throws an exception if setException() was called.  Otherwise returns the
-     * return value specified in the constructor or with setReturnValue().
-     *
-     * @param environment action execution environment
-     * @return value of returnValue data member
-     */
-    virtual bool execute(ActionEnvironment& environment) override
-    {
-        ++executeCount;
-
-        if (except)
-        {
-            ++exceptionCount;
-            throw *except;
-        }
-
-        return returnValue;
-    }
-
-    /**
-     * Returns the number of exceptions that have been thrown when execute() was
-     * called.
-     *
-     * @return number of exceptions thrown
-     */
-    size_t getExceptionCount() const
-    {
-        return exceptionCount;
-    }
-
-    /**
-     * Returns the number of times execute() has been called.
-     *
-     * @return number of times execute() called
-     */
-    size_t getExecuteCount() const
-    {
-        return executeCount;
-    }
-
-    /**
-     * Sets the value that will be returned when execute() is called.
-     *
-     * @param returnValue value to return from execute()
-     */
-    void setReturnValue(bool returnValue)
-    {
-        this->returnValue = returnValue;
-    }
-
-    /**
-     * Sets the exception that will be thrown when execute() is called.
-     *
-     * @param except exception to throw, or nullptr to throw no exception
-     */
-    void setException(std::unique_ptr<std::exception> except)
-    {
-        this->except = std::move(except);
-    }
-
-  private:
-    /**
-     * Value that will be returned when execute() is called.
-     */
-    bool returnValue{true};
-
-    /**
-     * Exception to throw (if any) when execute() is called.
-     */
-    std::unique_ptr<std::exception> except{nullptr};
-
-    /**
-     * Number of times execute() has been called on this action.
-     */
-    size_t executeCount{0};
-
-    /**
-     * Number of times an exception was thrown when execute() was called.
-     */
-    size_t exceptionCount{0};
-};
-
-} // namespace regulators
-} // namespace power
-} // namespace phosphor