Added patch_formats utility for i18n formatting tests

# -*- encoding: utf-8 -*-

from __future__ import unicode_literals

from contextlib import contextmanager

import datetime

import decimal

from importlib import import_module

    os.path.join(here, 'other', 'locale'),

)

@contextmanager

def patch_formats(lang, **settings):

    from django.utils.formats import _format_cache

    # Populate _format_cache with temporary values

    for key, value in settings.items():

        _format_cache[(key, lang)] = value

    try:

        yield

    finally:

        reset_format_cache()

class TranslationTests(TestCase):

        conditional test (e.g. 0 or empty string).

        Refs #16938.

        """

        from django.conf.locale.fr import formats as fr_formats

        # Back up original formats

        backup_THOUSAND_SEPARATOR = fr_formats.THOUSAND_SEPARATOR

        backup_FIRST_DAY_OF_WEEK = fr_formats.FIRST_DAY_OF_WEEK

        # Set formats that would get interpreted as False in a conditional test

        fr_formats.THOUSAND_SEPARATOR = ''

        fr_formats.FIRST_DAY_OF_WEEK = 0

        reset_format_cache()

        with patch_formats('fr', THOUSAND_SEPARATOR='', FIRST_DAY_OF_WEEK=0):

            with translation.override('fr'):

                with self.settings(USE_THOUSAND_SEPARATOR=True, THOUSAND_SEPARATOR='!'):

                    self.assertEqual('', get_format('THOUSAND_SEPARATOR'))

                    # Even a second time (after the format has been cached)...

                    self.assertEqual(0, get_format('FIRST_DAY_OF_WEEK'))

        # Restore original formats

        fr_formats.THOUSAND_SEPARATOR = backup_THOUSAND_SEPARATOR

        fr_formats.FIRST_DAY_OF_WEEK = backup_FIRST_DAY_OF_WEEK

    def test_l10n_enabled(self):

        self.maxDiff = 3000

        # Catalan locale