diff --git a/phosphor-regulators/test/id_map_tests.cpp b/phosphor-regulators/test/id_map_tests.cpp
new file mode 100644
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+++ b/phosphor-regulators/test/id_map_tests.cpp
@@ -0,0 +1,228 @@
+/**
+ * Copyright © 2019 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 "id_map.hpp"
+
+#include <exception>
+#include <stdexcept>
+#include <string>
+
+#include <gtest/gtest.h>
+
+using namespace phosphor::power::regulators;
+
+TEST(IDMapTests, AddDevice)
+{
+    IDMap idMap{};
+
+    // Create device
+    std::string id{"vio_reg"};
+    Device device{id};
+
+    // Verify device is not initially in map
+    EXPECT_THROW(idMap.getDevice(id), std::invalid_argument);
+
+    // Add device to map
+    idMap.addDevice(device);
+
+    // Verify device is now in map
+    try
+    {
+        Device& deviceFound = idMap.getDevice(id);
+        EXPECT_EQ(deviceFound.getID(), id);
+        EXPECT_EQ(&deviceFound, &device);
+    }
+    catch (const std::exception& error)
+    {
+        ADD_FAILURE() << "Should not have caught exception.";
+    }
+
+    // Verify different device is not in map
+    EXPECT_THROW(idMap.getDevice("vio_reg2"), std::invalid_argument);
+}
+
+TEST(IDMapTests, AddRail)
+{
+    IDMap idMap{};
+
+    // Create rail
+    std::string id{"vio0"};
+    Rail rail{id};
+
+    // Verify rail is not initially in map
+    EXPECT_THROW(idMap.getRail(id), std::invalid_argument);
+
+    // Add rail to map
+    idMap.addRail(rail);
+
+    // Verify rail is now in map
+    try
+    {
+        Rail& railFound = idMap.getRail(id);
+        EXPECT_EQ(railFound.getID(), id);
+        EXPECT_EQ(&railFound, &rail);
+    }
+    catch (const std::exception& error)
+    {
+        ADD_FAILURE() << "Should not have caught exception.";
+    }
+
+    // Verify different rail is not in map
+    EXPECT_THROW(idMap.getRail("vcs0"), std::invalid_argument);
+}
+
+TEST(IDMapTests, AddRule)
+{
+    IDMap idMap{};
+
+    // Create rule
+    std::string id{"set_voltage_rule"};
+    Rule rule{id};
+
+    // Verify rule is not initially in map
+    EXPECT_THROW(idMap.getRule(id), std::invalid_argument);
+
+    // Add rule to map
+    idMap.addRule(rule);
+
+    // Verify rule is now in map
+    try
+    {
+        Rule& ruleFound = idMap.getRule(id);
+        EXPECT_EQ(ruleFound.getID(), id);
+        EXPECT_EQ(&ruleFound, &rule);
+    }
+    catch (const std::exception& error)
+    {
+        ADD_FAILURE() << "Should not have caught exception.";
+    }
+
+    // Verify different rule is not in map
+    EXPECT_THROW(idMap.getRule("set_voltage_rule_page0"),
+                 std::invalid_argument);
+}
+
+TEST(IDMapTests, GetDevice)
+{
+    IDMap idMap{};
+
+    // Add a device to the map
+    std::string id{"vio_reg"};
+    Device device{id};
+    idMap.addDevice(device);
+
+    // Test where ID found in map
+    try
+    {
+        Device& deviceFound = idMap.getDevice(id);
+        EXPECT_EQ(deviceFound.getID(), id);
+        EXPECT_EQ(&deviceFound, &device);
+    }
+    catch (const std::exception& error)
+    {
+        ADD_FAILURE() << "Should not have caught exception.";
+    }
+
+    // Test where ID not found in map
+    try
+    {
+        idMap.getDevice("vcs_reg");
+        ADD_FAILURE() << "Should not have reached this line.";
+    }
+    catch (const std::invalid_argument& ia_error)
+    {
+        EXPECT_STREQ(ia_error.what(),
+                     "Unable to find device with ID \"vcs_reg\"");
+    }
+    catch (const std::exception& error)
+    {
+        ADD_FAILURE() << "Should not have caught exception.";
+    }
+}
+
+TEST(IDMapTests, GetRail)
+{
+    IDMap idMap{};
+
+    // Add a rail to the map
+    std::string id{"vio0"};
+    Rail rail{id};
+    idMap.addRail(rail);
+
+    // Test where ID found in map
+    try
+    {
+        Rail& railFound = idMap.getRail(id);
+        EXPECT_EQ(railFound.getID(), id);
+        EXPECT_EQ(&railFound, &rail);
+    }
+    catch (const std::exception& error)
+    {
+        ADD_FAILURE() << "Should not have caught exception.";
+    }
+
+    // Test where ID not found in map
+    try
+    {
+        idMap.getRail("vcs0");
+        ADD_FAILURE() << "Should not have reached this line.";
+    }
+    catch (const std::invalid_argument& ia_error)
+    {
+        EXPECT_STREQ(ia_error.what(), "Unable to find rail with ID \"vcs0\"");
+    }
+    catch (const std::exception& error)
+    {
+        ADD_FAILURE() << "Should not have caught exception.";
+    }
+}
+
+TEST(IDMapTests, GetRule)
+{
+    IDMap idMap{};
+
+    // Add a rule to the map
+    std::string id{"set_voltage_rule"};
+    Rule rule{id};
+    idMap.addRule(rule);
+
+    // Test where ID found in map
+    try
+    {
+        Rule& ruleFound = idMap.getRule(id);
+        EXPECT_EQ(ruleFound.getID(), id);
+        EXPECT_EQ(&ruleFound, &rule);
+    }
+    catch (const std::exception& error)
+    {
+        ADD_FAILURE() << "Should not have caught exception.";
+    }
+
+    // Test where ID not found in map
+    try
+    {
+        idMap.getRule("read_sensors_rule");
+        ADD_FAILURE() << "Should not have reached this line.";
+    }
+    catch (const std::invalid_argument& ia_error)
+    {
+        EXPECT_STREQ(ia_error.what(),
+                     "Unable to find rule with ID \"read_sensors_rule\"");
+    }
+    catch (const std::exception& error)
+    {
+        ADD_FAILURE() << "Should not have caught exception.";
+    }
+}