def test_cubes_is_iterator():
assert '__init__' in dir(Cubes)
iterator = iter(Cubes())
assert '__next__' in dir(iterator)
def test_is_iterator(self):
self.assertIn('__init__', dir(Cubes))
iterator = iter(Cubes())
self.assertIn('__next__', dir(iterator))
def test_cubes():
c = iter(Cubes())
for i in range(1, 1001):
assert next(c) == i**3
def test_cubes(self):
c = iter(Cubes())
for i in range(1, 1001):
with self.subTest(i = i):
self.assertEqual(next(c), i ** 3)