def test_has_entry(self):
selector = Selector(['uid', 'pid'])
self.assertTrue(selector.has_entry({'uid': 1}))
self.assertTrue(selector.has_entry({'uid': 1, 'pid': 2}))
self.assertTrue(selector.has_entry({'pid': 2}))
self.assertFalse(selector.has_entry({'id': 2}))
