test_setxattr() is broken

[ligurio]

        os.setxattr(target, attr_name, attr_value)                                                                                                
        assert attr_name.decode("utf-8") in os.listxattr(target)                                                                                  
>       assert os.getxattr(target, attr_name) == attr_value                                                                                       
E       AssertionError: assert b'' == b'unreliablefs'                                                                                             
E         Right contains 12 more items, first extra item: 117                                                                                     
E         Full diff:                                                                                                                              E         - b''                                                                                                                                   
E         + b'unreliablefs'                                                                                                                       

tests/test_unreliablefs.py:497: AssertionError