code: def test_flushes_stream_after_input(self):
      # issue 7208
      with mock.patch("os.open") as open, mock.patch(
          "io.FileIO"
      ), mock.patch("io.TextIOWrapper"), mock.patch(
          "termios.tcgetattr"
      ), mock.patch(
          "termios.tcsetattr"
      ):
          open.return_value = 3
          mock_stream = mock.Mock(spec=StringIO)
          getpass.unix_getpass(stream=mock_stream)
          mock_stream.flush.assert_called_with()
  
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 4 for calling the UnixGetpassTest obj's underlying member method code with example usage: obj.test_flushes_stream_after_input() without return types