def METHOD_NAME(self, tf):
    self.assertEqual(len(tf.getmembers()), 20)
    names = ["file%02d" % i for i in range(20)]
    self.assertEqual(tf.getnames(), names)
    for ti in tf.getmembers():
        self.assertEqual(ti.uid, 0)
        self.assertEqual(ti.gid, 0)
        self.assertEqual(ti.uname, "")
        self.assertEqual(ti.gname, "")
        self.assertEqual(ti.mode, MODE_STANDARD)
        self.assertEqual(ti.mtime, DEFAULT_MTIME)