@Test
public void testGetClassesShouldReturnDefaultValue() throws Exception {

  Configuration config = new Configuration();
  Class<?>[] classes =
      config.getClasses("testClassName", Configuration.class);
  assertEquals(
      "Not returning expected number of classes. Number of returned classes ="
          + classes.length, 1, classes.length);
  assertEquals("Not returning the default class Name", Configuration.class,
      classes[0]);
}