regulators: Create ActionError class

Create the ActionError exception class.  This exception describes an
error that occurred while executing an action, such as i2c_write_byte.

Change-Id: Ie11b59663ba51da74967454d6ca6ad8856ddd189
Signed-off-by: Shawn McCarney <shawnmm@us.ibm.com>
diff --git a/phosphor-regulators/test/actions/action_error_tests.cpp b/phosphor-regulators/test/actions/action_error_tests.cpp
new file mode 100644
index 0000000..63274ab
--- /dev/null
+++ b/phosphor-regulators/test/actions/action_error_tests.cpp
@@ -0,0 +1,47 @@
+/**
+ * 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_error.hpp"
+#include "run_rule_action.hpp"
+
+#include <gtest/gtest.h>
+
+using namespace phosphor::power::regulators;
+
+TEST(ActionErrorTests, Constructor)
+{
+    // Test where only action is specified
+    {
+        RunRuleAction action{"set_voltage_rule"};
+        ActionError error{action};
+        EXPECT_STREQ(error.what(), "ActionError: run_rule: set_voltage_rule");
+    }
+
+    // Test where action and error message are specified
+    {
+        RunRuleAction action{"set_voltage_rule"};
+        ActionError error{action, "Infinite loop"};
+        EXPECT_STREQ(error.what(),
+                     "ActionError: run_rule: set_voltage_rule: Infinite loop");
+    }
+}
+
+TEST(ActionErrorTests, What)
+{
+    RunRuleAction action{"set_voltage_rule"};
+    ActionError error{action, "Invalid rule ID"};
+    EXPECT_STREQ(error.what(),
+                 "ActionError: run_rule: set_voltage_rule: Invalid rule ID");
+}
diff --git a/phosphor-regulators/test/meson.build b/phosphor-regulators/test/meson.build
index 6db6b88..c051097 100644
--- a/phosphor-regulators/test/meson.build
+++ b/phosphor-regulators/test/meson.build
@@ -10,6 +10,7 @@
     'rule_tests.cpp',
 
     'actions/action_environment_tests.cpp',
+    'actions/action_error_tests.cpp',
     'actions/action_utils_tests.cpp',
     'actions/and_action_tests.cpp',
     'actions/if_action_tests.cpp',