def test_screenshot(self): server = AutomatorServer() server.sdk_version = MagicMock() server.sdk_version.return_value = 17 self.assertEqual(server.screenshot(), None) server.sdk_version.return_value = 18 self.urlopen.return_value.read = MagicMock() self.urlopen.return_value.read.return_value = b"123456" self.assertEqual(server.screenshot(), b"123456") self.assertEqual(server.screenshot("/tmp/test.txt"), "/tmp/test.txt")