old_contents: # -*- coding: utf-8 -*-
  
  import pytest
  
  from cookiecutter.environment import StrictEnvironment
  from cookiecutter.exceptions import UnknownExtension
  
  
  def test_env_should_raise_for_unknown_extension():
      context = {
          'cookiecutter': {
              '_extensions': ['foobar']
          }
      }
  
      with pytest.raises(UnknownExtension) as err:
          StrictEnvironment(context=context, keep_trailing_newline=True)
  
      assert 'Unable to load extension: ' in str(err.value)
  
new_contents: # -*- coding: utf-8 -*-
  
  import pytest
  
  from cookiecutter.environment import StrictEnvironment
  from cookiecutter.exceptions import UnknownExtension
  
  
  def test_env_should_raise_for_unknown_extension():
      context = {
          'cookiecutter': {
              '_extensions': ['foobar']
          }
      }
  
      with pytest.raises(UnknownExtension) as err:
          StrictEnvironment(context=context, keep_trailing_newline=True)
  
      assert 'Unable to load extension: ' in str(err.value)
  
  
  def test_env_should_come_with_jinja2_time_extension():
      env = StrictEnvironment(keep_trailing_newline=True)
      assert 'jinja2_time.jinja2_time.TimeExtension' in env.extensions
  
subject: Add a simple test to make sure cookiecutter comes with jinja2_time