def test_len(self):
cmd = CommandListBase()
self.assertEqual(0, len(cmd))
cmd.append(Command())
self.assertEqual(1, len(cmd))
def test_bool(self):
cmd = CommandListBase()
self.assertFalse(bool(cmd))
cmd.append(Command())
self.assertTrue(bool(cmd))
def test_append(self):
cmd_list = CommandListBase()
cmd = Command()
cmd_list.append(cmd)
self.assertEqual(cmd, cmd_list[0])
