old_contents: # -*- coding: utf-8 -*-
  
  from cookiecutter import exceptions
  
  
  def test_undefined_variable_to_str():
      undefined_var_error = exceptions.UndefinedVariableInTemplate(
          'Beautiful is better than ugly',
          exceptions.CookiecutterException('Errors should never pass silently'),
          {'cookiecutter': {'foo': 'bar'}}
      )
  
      expected_str = (
          "Beautiful is better than ugly. "
          "Error message: Errors should never pass silently. "
          "Context: {'cookiecutter': {'foo': 'bar'}}"
      )
  
      assert str(undefined_var_error) == expected_str
  
new_contents: # -*- coding: utf-8 -*-
  
  from jinja2.exceptions import UndefinedError
  
  from cookiecutter import exceptions
  
  
  def test_undefined_variable_to_str():
      undefined_var_error = exceptions.UndefinedVariableInTemplate(
          'Beautiful is better than ugly',
          UndefinedError('Errors should never pass silently'),
          {'cookiecutter': {'foo': 'bar'}}
      )
  
      expected_str = (
          "Beautiful is better than ugly. "
          "Error message: Errors should never pass silently. "
          "Context: {'cookiecutter': {'foo': 'bar'}}"
      )
  
      assert str(undefined_var_error) == expected_str
  
subject: Create a jinja2 error in the test to ensure it has a message attribute