Add a Unity macro to assert on platform error code difference

Author: David Saada

features/frameworks/unity/unity/unity.h

@@ -294,6 +294,15 @@ void tearDown(void);
 #define TEST_ASSERT_DOUBLE_IS_NOT_NAN_MESSAGE(actual, message)                                     UNITY_TEST_ASSERT_DOUBLE_IS_NOT_NAN((actual), __LINE__, (message))
 #define TEST_ASSERT_DOUBLE_IS_NOT_DETERMINATE_MESSAGE(actual, message)                             UNITY_TEST_ASSERT_DOUBLE_IS_NOT_DETERMINATE((actual), __LINE__, (message))
 
+
+/*-------------------------------------------------------
+ * Error code checking
+ *-------------------------------------------------------*/
+// Use these to check whether error code equals what we expect.
+// Only display error code (without other information)
+#define TEST_ASSERT_EQUAL_ERROR_CODE(expected, actual)                                             TEST_ASSERT_EQUAL(MBED_GET_ERROR_CODE(expected), MBED_GET_ERROR_CODE(actual))
+#define TEST_ASSERT_EQUAL_ERROR_CODE_MESSAGE(expected, actual, message)                            TEST_ASSERT_EQUAL_MESSAGE(MBED_GET_ERROR_CODE(expected), MBED_GET_ERROR_CODE(actual))
+
 /*-------------------------------------------------------
  * Test skipping
  *-------------------------------------------------------*/