def test_scale_empty(self): scale = DeviceManager.get_instance().scale self.assertIsNone(scale)
def test_singleton(self): instance1 = DeviceManager.get_instance() instance2 = DeviceManager.get_instance() self.assertEqual(instance1, instance2)
def test_printer_empty(self): printer = DeviceManager.get_instance().printer self.assertIsNone(printer)
def test_scale_empty(self): scale = DeviceManager.get_instance().scale self.assertIsNone(scale)
def test_printer_empty(self): printer = DeviceManager.get_instance().printer self.assertIsNone(printer)
def test_singleton(self): instance1 = DeviceManager.get_instance() instance2 = DeviceManager.get_instance() self.assertEqual(instance1, instance2)
def device_manager(self): return DeviceManager.get_instance()
def device_manager(self): return DeviceManager.get_instance()