class TestDataCheckpoint(unittest.TestCase):
def setUp(self):
self._checkpoint = DataCheckpoint()
def test_operator_bool_false_on_init(self):
self.assertFalse(self._checkpoint)
def test_operator_bool_true_with_data(self):
self._checkpoint.replace('abc')
self.assertTrue(self._checkpoint)
def test_replace(self):
self._checkpoint.replace('abc')
self.assertEqual(self._checkpoint.data, 'abc')
self._checkpoint.replace('def')
self.assertEqual(self._checkpoint.data, 'def')
def test_append(self):
self._checkpoint.append('abc')
self.assertEqual(self._checkpoint.data, 'abc')
self._checkpoint.append('def')
self.assertEqual(self._checkpoint.data, 'abcdef')
def test_clear(self):
self._checkpoint.append('abc')
self.assertEqual(self._checkpoint.data, 'abc')
self._checkpoint.clear()
self.assertEqual(self._checkpoint.data, None)
