Create regulators SetDeviceAction class

Create the SetDeviceAction class that implements the set_device action
in the JSON config file.

Signed-off-by: Shawn McCarney <shawnmm@us.ibm.com>
Change-Id: I31b8fbc144aa2cb2b4b3373fda559b0404d271cb
diff --git a/phosphor-regulators/test/actions/set_device_action_tests.cpp b/phosphor-regulators/test/actions/set_device_action_tests.cpp
new file mode 100644
index 0000000..6164a46
--- /dev/null
+++ b/phosphor-regulators/test/actions/set_device_action_tests.cpp
@@ -0,0 +1,65 @@
+/**
+ * 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.
+ */
+#include "action_environment.hpp"
+#include "device.hpp"
+#include "id_map.hpp"
+#include "set_device_action.hpp"
+
+#include <exception>
+
+#include <gtest/gtest.h>
+
+using namespace phosphor::power::regulators;
+
+TEST(SetDeviceActionTests, Constructor)
+{
+    SetDeviceAction action{"regulator1"};
+    EXPECT_EQ(action.getDeviceID(), "regulator1");
+}
+
+TEST(SetDeviceActionTests, Execute)
+{
+    // Create IDMap
+    IDMap idMap{};
+    Device reg1{"regulator1"};
+    idMap.addDevice(reg1);
+    Device reg2{"regulator2"};
+    idMap.addDevice(reg2);
+
+    // Create ActionEnvironment
+    ActionEnvironment env{idMap, "regulator1"};
+
+    // Create action
+    SetDeviceAction action{"regulator2"};
+
+    // Execute action
+    try
+    {
+        EXPECT_EQ(env.getDeviceID(), "regulator1");
+        EXPECT_EQ(action.execute(env), true);
+        EXPECT_EQ(env.getDeviceID(), "regulator2");
+    }
+    catch (const std::exception& error)
+    {
+        ADD_FAILURE() << "Should not have caught exception.";
+    }
+}
+
+TEST(SetDeviceActionTests, GetDeviceID)
+{
+    SetDeviceAction action{"io_expander_0"};
+    EXPECT_EQ(action.getDeviceID(), "io_expander_0");
+}