docs: def step_undefined_step_snippet_should_not_exist_for(context, step):
      """
      Checks if an undefined-step snippet is provided for a step
      in behave command output (last command).
      """
      undefined_step_snippet = make_undefined_step_snippet(step)
      context.execute_steps(u'''\
  Then the command output should not contain:
      """
      {undefined_step_snippet}
      """
      '''.format(undefined_step_snippet=text_indent(undefined_step_snippet, 4)))