docstr: Test streamlitfile_util.streamlit_read.
docstr_tok: ["Test","streamlitfile_util.streamlit_read","."]
code: def test_streamlit_read(self):
      """Test streamlitfile_util.streamlit_read."""
      with file_util.streamlit_read(FILENAME) as input:
          data = input.read()
      self.assertEqual("data", data)
  
imports: import errno
  import os
  import unittest
  from unittest.mock import MagicMock, mock_open, patch
  import pytest
  from streamlit import file_util, util
label_desc: Use image node_id 3 for calling the FileUtilTest obj's underlying member method code with example usage: obj.test_streamlit_read() without return types