test_functional.py 文件源码

def test_unforeseen_mdtm_event(self):
        # Emulate a case where the file last modification time is prior
        # to year 1900.  This most likely will never happen unless
        # someone specifically force the last modification time of a
        # file in some way.
        # To do so we temporarily override os.path.getmtime so that it
        # returns a negative value referring to a year prior to 1900.
        # It causes time.localtime/gmtime to raise a ValueError exception
        # which is supposed to be handled by server.

        # On python 3 it seems that the trick of replacing the original
        # method with the lambda doesn't work.
        if not PY3:
            _getmtime = AbstractedFS.getmtime
            try:
                AbstractedFS.getmtime = lambda x, y: -9000000000
                self.assertRaisesRegex(
                    ftplib.error_perm,
                    "550 Can't determine file's last modification time",
                    self.client.sendcmd, 'mdtm ' + self.tempfile)
                # make sure client hasn't been disconnected
                self.client.sendcmd('noop')
            finally:
                AbstractedFS.getmtime = _getmtime