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__'