Switched mail tests to SimpleTestCase.

        EmailMultiAlternatives, send_mail, send_mass_mail)

from django.core.mail.backends import console, dummy, locmem, filebased, smtp

from django.core.mail.message import BadHeaderError

from django.test import TestCase

from django.test import SimpleTestCase

from django.test.utils import override_settings

from django.utils.encoding import force_str, force_text

from django.utils.six import PY3, StringIO, string_types

                        'the following headers: %s' % (headers - msg_headers),)

class MailTests(HeadersCheckMixin, TestCase):

class MailTests(HeadersCheckMixin, SimpleTestCase):

    """

    Non-backend specific tests.

    """

        self.assertTrue(str('Child Subject') in parent_s)

class PythonGlobalState(TestCase):

class PythonGlobalState(SimpleTestCase):

    """

    Tests for #12422 -- Django smarts (#2472/#11212) with charset of utf-8 text

    parts shouldn't pollute global email Python package charset registry when

            self.fail("close() unexpectedly raised an exception: %s" % e)

class LocmemBackendTests(BaseEmailBackendTests, TestCase):

class LocmemBackendTests(BaseEmailBackendTests, SimpleTestCase):

    email_backend = 'django.core.mail.backends.locmem.EmailBackend'

    def get_mailbox_content(self):

            send_mail('Subject\nMultiline', 'Content', 'from@example.com', ['to@example.com'])

class FileBackendTests(BaseEmailBackendTests, TestCase):

class FileBackendTests(BaseEmailBackendTests, SimpleTestCase):

    email_backend = 'django.core.mail.backends.filebased.EmailBackend'

    def setUp(self):

        connection.close()

class ConsoleBackendTests(BaseEmailBackendTests, TestCase):

class ConsoleBackendTests(BaseEmailBackendTests, SimpleTestCase):

    email_backend = 'django.core.mail.backends.console.EmailBackend'

    def setUp(self):

            self.join()

class SMTPBackendTests(BaseEmailBackendTests, TestCase):

class SMTPBackendTests(BaseEmailBackendTests, SimpleTestCase):

    email_backend = 'django.core.mail.backends.smtp.EmailBackend'

    @classmethod