def test_add_list(self):
test = List([1, 2, 3])
test += [4, 5, 6]
self.assertIsInstance(test, List)
self.assertEqual(test, [1, 2, 3, 4, 5, 6])
test = test + [7, 8]
self.assertIsInstance(test, List)
self.assertEqual(test, [1, 2, 3, 4, 5, 6, 7, 8])
def test_none(self):
"""As a special exception, we allow None to be treated as an empty
list."""
test = List([1, 2, 3])
test += None
self.assertEqual(test, [1, 2, 3])
test = test + None
self.assertIsInstance(test, List)
self.assertEqual(test, [1, 2, 3])
with self.assertRaises(ValueError):
test += False
with self.assertRaises(ValueError):
test = test + False
def test_add_string(self):
test = List([1, 2, 3])
with self.assertRaises(ValueError):
test += 'string'
