@Test
public void testRequiredProperties()
{

  Set<String> requiredProperties = ap.getRequiredProperties();
  Assert.assertEquals(2, requiredProperties.size());
  String[] rp = requiredProperties.toArray(new String[]{});
  Assert.assertEquals("dt.test.required.1", rp[0]);
  Assert.assertEquals("dt.test.required.2", rp[1]);
}