code: def test_io_read_file(fs, patchs, monkeypatch):
      _, path_to, _, write, _, _, _ = fs
      mock_patchs(monkeypatch, patchs)
  
      fname = path_to("test_io_read_file")
      body = b"abcdefghijklmn"
      write(fname, body)
  
      assert tf.io.read_file(fname) == body
  
imports: import functools
  import os
  import posixpath
  import random
  import socket
  import sys
  import time
  from urllib.parse import urlparse
  import pytest
  import tensorflow
  import tensorflow_io
label_desc: Use image node_id 12 for calling a global function with example usage: test_io_read_file(fs, patchs, monkeypatch) without return types