def test_log_file(self):

       custom_log = tempdir.join('log.out')

       py.log.setconsumer("default", open(str(custom_log), 'w', buffering=0))

       py.log.default("hello world #1") 

       assert custom_log.readlines() == ['[default] hello world #1\n']

       py.log.setconsumer("default", py.log.Path(custom_log, buffering=0))

       py.log.default("hello world #2") 

->     assert custom_log.readlines() == ['[default] hello world #2\n'] # no append by default!