def test_disk_cow(self):
        pool_config = """<pool><target><path>/poolpath</path></target></pool>"""
        disk_config = """<volume><target><path>/path/volume.qcow2</path></target><capacity>10</capacity></volume>"""
        expected = """<volume type="file"><name>foo</name><uuid>foo</uuid><target>""" +\
                   """<path>/poolpath/foo.qcow2</path><permissions><mode>0644</mode>""" +\
                   """</permissions><format type="qcow2" />""" +\
                   """</target><capacity>10</capacity><backingStore><path>/path/volume.qcow2</path>""" +\
                   """<format type="qcow2" /></backingStore></volume>"""
        results = qemu.disk_xml('foo', pool_config, disk_config, True)
        results = results.replace('\n', '').replace('\t', '').replace('  ', '')
        self.assertEqual(results, expected, compare(results, expected))
XML with COW.
dataset/ETHPy150Open F-Secure/see/see/context/resources/test/qemu_test.py/DiskXMLTest.test_disk_cow