docstr: Test streamlitfile_util.streamlit_read.
docstr_tok: ["Test","streamlitfile_util.streamlit_read","."]
code: def test_streamlit_read_zero_bytes(self):
      """Test streamlitfile_util.streamlit_read."""
      self.os_stat.return_value.st_size = 0
      with pytest.raises(util.Error) as e:
          with file_util.streamlit_read(FILENAME) as input:
              input.read()
      self.assertEqual(
          str(e.value), 'Read zero byte file: "/some/cache/file"'
      )
  
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 5 for calling the FileUtilTest obj's underlying member method code with example usage: obj.test_streamlit_read_zero_bytes() without return types