@property
    def dsr(self):
        return win32.MS_DSR_ON & self._GetCommModemStatus() != 0
Test that a file:// dir gets listdir run with expand_dir
dataset/ETHPy150Open pyserial/pyserial/serial/serialwin32.py/Serial.dsr--crossover with--dataset/ETHPy150Open pypa/pip/tests/unit/test_index.py/test_sort_locations_file_expand_dir