z is used to trick this test case to appear after vanilla in default suite z is used to trick this test case to appear after vanilla in default suite
import doctest
from unittest import TestCase

from django.test import SimpleTestCase
from django.test import TestCase as DjangoTestCase

from . import doctests


class TestVanillaUnittest(TestCase):
    def test_sample(self):
        self.assertEqual(1, 1)


class TestDjangoTestCase(DjangoTestCase):
    def test_sample(self):
        self.assertEqual(1, 1)


class TestZimpleTestCase(SimpleTestCase):
    

    def test_sample(self):
        self.assertEqual(1, 1)


class EmptyTestCase(TestCase):
    pass


def load_tests(loader, tests, ignore):
    tests.addTests(doctest.DocTestSuite(doctests))
    return tests