code: def test_falls_back_to_fallback_if_termios_raises(self):
      with mock.patch("os.open") as open, mock.patch(
          "io.FileIO"
      ) as fileio, mock.patch("io.TextIOWrapper") as textio, mock.patch(
          "termios.tcgetattr"
      ), mock.patch(
          "termios.tcsetattr"
      ) as tcsetattr, mock.patch(
          "getpass.fallback_getpass"
      ) as fallback:
          open.return_value = 3
          fileio.return_value = BytesIO()
          tcsetattr.side_effect = termios.error
          getpass.unix_getpass()
          fallback.assert_called_once_with(
              "Password: ", textio.return_value
          )
  
imports: import getpass
  import os
  import unittest
  from io import BytesIO, StringIO, TextIOWrapper
  from unittest import mock
  from test import support
label_desc: Use image node_id 3 for calling the UnixGetpassTest obj's underlying member method code with example usage: obj.test_falls_back_to_fallback_if_termios_raises() without return types