regulators: Create regulators CompareVPDAction class

Create the CompareVPDAction class that implements the
"compare_vpd" action in the JSON config file.

Only create the .hpp file for CompareVPDAction class first.

Signed-off-by: Bob King <Bob_King@wistron.com>
Change-Id: I49663e1f9a2a28996b397cca47eb2c47847592bf
diff --git a/phosphor-regulators/test/actions/compare_vpd_action_tests.cpp b/phosphor-regulators/test/actions/compare_vpd_action_tests.cpp
new file mode 100644
index 0000000..8ae721b
--- /dev/null
+++ b/phosphor-regulators/test/actions/compare_vpd_action_tests.cpp
@@ -0,0 +1,66 @@
+/**
+ * Copyright © 2020 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 "compare_vpd_action.hpp"
+#include "id_map.hpp"
+
+#include <exception>
+#include <memory>
+#include <stdexcept>
+#include <utility>
+
+#include <gtest/gtest.h>
+
+using namespace phosphor::power::regulators;
+
+TEST(CompareVPDActionTests, Constructor)
+{
+    CompareVPDAction action{"/system/chassis/disk_backplane", "CCIN", "2D35"};
+    EXPECT_EQ(action.getFRU(), "/system/chassis/disk_backplane");
+    EXPECT_EQ(action.getKeyword(), "CCIN");
+    EXPECT_EQ(action.getValue(), "2D35");
+}
+
+TEST(CompareVPDActionTests, Execute)
+{
+    // TODO: Not implemented yet
+}
+
+TEST(CompareVPDActionTests, GetFRU)
+{
+    CompareVPDAction action{"/system/chassis/disk_backplane", "CCIN", "2D35"};
+    EXPECT_EQ(action.getFRU(), "/system/chassis/disk_backplane");
+}
+
+TEST(CompareVPDActionTests, GetKeyword)
+{
+    CompareVPDAction action{"/system/chassis/disk_backplane", "CCIN", "2D35"};
+    EXPECT_EQ(action.getKeyword(), "CCIN");
+}
+
+TEST(CompareVPDActionTests, GetValue)
+{
+    CompareVPDAction action{"/system/chassis/disk_backplane", "CCIN", "2D35"};
+    EXPECT_EQ(action.getValue(), "2D35");
+}
+
+TEST(CompareVPDActionTests, ToString)
+{
+    CompareVPDAction action{"/system/chassis/disk_backplane", "CCIN", "2D35"};
+    EXPECT_EQ(action.toString(),
+              "compare_vpd: { fru: /system/chassis/disk_backplane, keyword: "
+              "CCIN, value: 2D35 }");
+}