def test_append_to_singleton(self):
obj = Traverser({'username': '******'})
obj.append({'username': '******'})
self.assertEqual(obj(), [{'username': '******'}, {'username': '******'}])
obj = Traverser({'username': '******'})
obj.append(Traverser({'username': '******'}))
self.assertEqual(obj(), [{'username': '******'}, {'username': '******'}])
def test_append_call_chain(self):
obj = Traverser([])
self.assertTrue(obj.append({}) is obj)
