from django.test import SimpleTestCase

from django.test.testcases import SerializeMixin

class TestSerializeMixin(SimpleTestCase):

    def test_init_without_lockfile(self):

        msg = (

            "ExampleTests.lockfile isn't set. Set it to a unique value in the "

            "base class."

        )

        with self.assertRaisesMessage(ValueError, msg):

            class ExampleTests(SerializeMixin, SimpleTestCase):

                pass

class TestSerializeMixinUse(SerializeMixin, SimpleTestCase):

    lockfile = __file__

    def test_usage(self):

        # Running this test ensures that the lock/unlock functions have passed.

        pass