Fixed minor warnings in tests.

# -*- coding: utf-8 -*-

from __future__ import unicode_literals

from warnings import catch_warnings

import warnings

from django.forms import *

from django.test import TestCase

                 (b'\xd1\x88\xd1\x82.', b'\xd1\x88\xd1\x82.'))

        f = ChoiceField(choices=UNITS)

        self.assertEqual(f.clean('\u0448\u0442.'), '\u0448\u0442.')

        with catch_warnings(record=True):

        with warnings.catch_warnings():

            # Ignore UnicodeWarning

            warnings.simplefilter("ignore")

            self.assertEqual(f.clean(b'\xd1\x88\xd1\x82.'), '\u0448\u0442.')

        # Translated error messages used to be buggy.

        # Test exceptions raised

        for path in ('no_dots_in_path', 'unexistent.path',

                'tests.utils_tests.unexistent'):

                'utils_tests.unexistent'):

            self.assertRaises(ImproperlyConfigured, import_by_path, path)

        with self.assertRaises(ImproperlyConfigured) as cm: