class_docstr: Tests command line interface of `tabnanny`.
class_docstr_tok: ["Tests","command","line","interface","of","`","tabnanny","`","."]
docstr: Should not display anything if python file is correctly indented.
docstr_tok: ["Should","not","display","anything","if","python","file","is","correctly","indented","."]
code: def test_with_error_free_file(self):
      """Should not display anything if python file is correctly indented."""
      with TemporaryPyFile(SOURCE_CODES["error_free"]) as file_path:
          self.validate_cmd(file_path)
  
imports: from unittest import TestCase, mock
  import errno
  import os
  import tabnanny
  import tokenize
  import tempfile
  import textwrap
  from test.support import captured_stderr, captured_stdout, script_helper, findfile
  from test.support.os_helper import unlink
label_desc: Use image node_id 3 for calling the TestCommandLine obj's underlying member method code with example usage: obj.test_with_error_free_file() without return types