def test_used_at_moves_forward(self):
image = cleaner.DockerImage(MockImage())
image.used_at(6)
image.used_at(8)
self.assertEqual(8, image.last_used)
def test_used_at_does_not_go_backward(self):
image = cleaner.DockerImage(MockImage())
image.used_at(4)
image.used_at(2)
self.assertEqual(4, image.last_used)
def test_used_at_sets_last_used(self):
image = cleaner.DockerImage(MockImage())
image.used_at(5)
self.assertEqual(5, image.last_used)
