tests: introduce doctest_mock_ugettext to allow doctests of localized code Future doctests will require some extra mocking, as the code-under-test uses translation (ugettext aka '_') and its provider TurboGears2 needs a context. Avoid this complexity by mocking ugettext as the identity function. This is done by providing a pytest fixture 'doctest_mock_ugettext' that will mock uggettext in the module that uses the fixture.