[py3] Fixed the str tests.

import datetime

from django.test import TestCase

from django.utils import six

from django.utils.unittest import skipIf

from .models import Article, InternationalArticle

class SimpleTests(TestCase):

    @skipIf(six.PY3, "tests a __str__ method returning unicode under Python 2")

    def test_basic(self):

        a = Article.objects.create(

            headline=b'Area man programs in Python',

            pub_date=datetime.datetime(2005, 7, 28)

        )

        self.assertEqual(str(a), b'Area man programs in Python')

        self.assertEqual(repr(a), b'<Article: Area man programs in Python>')

        self.assertEqual(str(a), str('Area man programs in Python'))

        self.assertEqual(repr(a), str('<Article: Area man programs in Python>'))

    def test_international(self):

        a = InternationalArticle.objects.create(

            headline='Girl wins €12.500 in lottery',

            pub_date=datetime.datetime(2005, 7, 28)

        )

        # The default str() output will be the UTF-8 encoded output of __unicode__().

        if six.PY3:

            self.assertEqual(str(a), 'Girl wins €12.500 in lottery')

        else:

            # On Python 2, the default str() output will be the UTF-8 encoded

            # output of __unicode__() -- or __str__() when the

            # python_2_unicode_compatible decorator is used.

            self.assertEqual(str(a), b'Girl wins \xe2\x82\xac12.500 in lottery')