code: def test_master_read(self):
      # XXX(nnorwitz):  this test leaks fds when there is an error.
      debug("Calling pty.openpty()")
      master_fd, slave_fd = pty.openpty()
      debug(f"Got master_fd '{master_fd}', slave_fd '{slave_fd}'")
  
      self.addCleanup(os.close, master_fd)
  
      debug("Closing slave_fd")
      os.close(slave_fd)
  
      debug("Reading from master_fd")
      try:
          data = os.read(master_fd, 1)
      except OSError:  # Linux
          data = b""
  
      self.assertEqual(data, b"")
  
imports: from test.support import verbose, reap_children
  from test.support.import_helper import import_module
  import errno
  import os
  import pty
  import tty
  import sys
  import select
  import signal
  import socket
  import io
  import unittest
  import warnings
label_desc: Use image node_id 5 for calling the PtyTest obj's underlying member method code with example usage: obj.test_master_read() without return types