diff --git a/phosphor-regulators/test/pmbus_error_tests.cpp b/phosphor-regulators/test/pmbus_error_tests.cpp
new file mode 100644
index 0000000..670df71
--- /dev/null
+++ b/phosphor-regulators/test/pmbus_error_tests.cpp
@@ -0,0 +1,34 @@
+/**
+ * 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 "pmbus_error.hpp"
+
+#include <gtest/gtest.h>
+
+using namespace phosphor::power::regulators;
+
+TEST(PMBusErrorTests, Constructor)
+{
+    PMBusError error("VOUT_MODE contains unsupported data format");
+    EXPECT_STREQ(error.what(),
+                 "PMBusError: VOUT_MODE contains unsupported data format");
+}
+
+TEST(PMBusErrorTests, What)
+{
+    PMBusError error("Unable to convert value to linear data format");
+    EXPECT_STREQ(error.what(),
+                 "PMBusError: Unable to convert value to linear data format");
+}