class_docstr: Tests command line interface of `tabnanny`.
class_docstr_tok: ["Tests","command","line","interface","of","`","tabnanny","`","."]
docstr: Should display detailed error information if double verbose is on.
docstr_tok: ["Should","display","detailed","error","information","if","double","verbose","is","on","."]
code: def test_double_verbose_mode(self):
      """Should display detailed error information if double verbose is on."""
      with TemporaryPyFile(SOURCE_CODES["nannynag_errored"]) as path:
          stdout = textwrap.dedent(
              "offending line: '\\tprint(\"world\")'"
          ).strip()
          self.validate_cmd("-vv", path, stdout=stdout, partial=True)
  
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 7 for calling the TestCommandLine obj's underlying member method code with example usage: obj.test_double_verbose_mode() without return types