regulators: Create Chassis class

Create C++ class that implements the 'chassis' element from the JSON
config file.  See chassis.md for more information.

Signed-off-by: Shawn McCarney <shawnmm@us.ibm.com>
Change-Id: I00544ad00fb810bc5d25896c83f2d7dd1221937d
diff --git a/phosphor-regulators/test/test_utils.hpp b/phosphor-regulators/test/test_utils.hpp
new file mode 100644
index 0000000..cbb322a
--- /dev/null
+++ b/phosphor-regulators/test/test_utils.hpp
@@ -0,0 +1,33 @@
+/**
+ * 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 "i2c_interface.hpp"
+
+#include <memory>
+
+namespace phosphor::power::regulators::test_utils
+{
+
+/**
+ * Create an I2CInterface object with hard-coded bus and address values.
+ *
+ * @return I2CInterface object wrapped in a unique_ptr
+ */
+inline std::unique_ptr<i2c::I2CInterface> createI2CInterface()
+{
+    return i2c::create(1, 0x70, i2c::I2CInterface::InitialState::CLOSED);
+}
+
+} // namespace phosphor::power::regulators::test_utils