Validate the priority of an LED is same

Need to make sure that the priority of a particular LED is the same
across all groups, it needs to throw the std::runtime_error if not
the same.

Tested: Manually changed the JSON file to have priority of a particular
LED different across groups and saw ledManager throw a runtime exception
and failed to run.

Signed-off-by: George Liu <liuxiwei@inspur.com>
Change-Id: I9d3e788dd86defb9a781dc958976b51ec7d3fd19
diff --git a/test/utest-led-json.cpp b/test/utest-led-json.cpp
index 32d89a8..f0ca022 100644
--- a/test/utest-led-json.cpp
+++ b/test/utest-led-json.cpp
@@ -65,4 +65,25 @@
 {
     static constexpr auto jsonPath = "config/led-group-config-malformed.json";
     ASSERT_THROW(loadJsonConfig(jsonPath), std::exception);
+}
+
+TEST(validatePriority, testGoodPriority)
+{
+    PriorityMap priorityMap{};
+    validatePriority("heartbeat", phosphor::led::Layout::Blink, priorityMap);
+    validatePriority("power", phosphor::led::Layout::On, priorityMap);
+
+    ASSERT_EQ(priorityMap.at("heartbeat"), phosphor::led::Layout::Blink);
+    ASSERT_EQ(priorityMap.at("power"), phosphor::led::Layout::On);
+}
+
+TEST(validatePriority, testBadPriority)
+{
+    PriorityMap priorityMap{};
+    validatePriority("heartbeat", phosphor::led::Layout::Blink, priorityMap);
+
+    ASSERT_EQ(priorityMap.at("heartbeat"), phosphor::led::Layout::Blink);
+    ASSERT_THROW(
+        validatePriority("heartbeat", phosphor::led::Layout::On, priorityMap),
+        std::runtime_error);
 }
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