regulators: Create journal interface

Create a light-weight interface for logging messages to the systemd
journal.

The standard interface implementation calls the phosphor-logging
functions to create real journal entries.  This is the implementation
that the phosphor-regulators application links with.

The mock interface implementation stores the journal messages in static
vectors and provides functions to access them.  This is the
implementation that testcases link with.

Signed-off-by: Shawn McCarney <shawnmm@us.ibm.com>
Change-Id: I5421794f7402f999b65c8367db5dd5ba07110f4a
diff --git a/phosphor-regulators/test/mock_journal.hpp b/phosphor-regulators/test/mock_journal.hpp
new file mode 100644
index 0000000..8e2a255
--- /dev/null
+++ b/phosphor-regulators/test/mock_journal.hpp
@@ -0,0 +1,51 @@
+/**
+ * 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.
+ */
+#pragma once
+
+#include "journal.hpp"
+
+#include <string>
+#include <vector>
+
+/**
+ * Extensions to the systemd journal interface.
+ *
+ * Provides functions to access and clear mock journal messages that have been
+ * logged.  These functions should only be used by testcases.
+ */
+namespace phosphor::power::regulators::journal
+{
+
+/**
+ * Clears all mock journal messages.
+ */
+void clear();
+
+/**
+ * Returns all mock journal messages with a priority value of 'ERR'.
+ *
+ * @return mock error messages
+ */
+const std::vector<std::string>& getErrMessages();
+
+/**
+ * Returns all mock journal messages with a priority value of 'INFO'.
+ *
+ * @return mock informational messages
+ */
+const std::vector<std::string>& getInfoMessages();
+
+} // namespace phosphor::power::regulators::journal