def test_sdX_to_xvdX(self):
        self.assertEqual(
            (FilePath(b"/dev/xvdj"), FilePath(b"/dev/xvdo")),
            (_expected_device(b"/dev/sdj"), _expected_device(b"/dev/sdo")),
        )
``sdX``-style devices are rewritten to corresponding ``xvdX`` devices.
dataset/ETHPy150Open ClusterHQ/flocker/flocker/node/agents/test/test_ebs.py/ExpectedDeviceTests.test_sdX_to_xvdX