@Test(dependsOnMethods = {"updateSource"})

public void deleteSource()
{
   int sourceId = 4;
   int expectedCount = service.count() - 1;
   Source source = new Source();
   source.setId(sourceId);
   Assert.assertTrue(service.deleteSource(source));
   Assert.assertEquals(service.count(), expectedCount);
   Assert.assertNull(service.getSource(sourceId));
   Assert.assertFalse(service.deleteSource(source));
}