import unittest

class NoDatabaseTests(unittest.TestCase):

    def test_nothing(self):

        pass

class DefaultDatabaseTests(NoDatabaseTests):

    databases = {"default"}

class DefaultDatabaseSerializedTests(NoDatabaseTests):

    databases = {"default"}

    serialized_rollback = True

class OtherDatabaseTests(NoDatabaseTests):

    databases = {"other"}

class AllDatabasesTests(NoDatabaseTests):

    databases = "__all__"