def setUp(self):
        """Run before each test method to initialize test environment."""
        super(TestCase, self).setUp()
        test_timeout = os.environ.get('OS_TEST_TIMEOUT', 0)
        try:
            test_timeout = int(test_timeout)
        except __HOLE__:
            # If timeout value is invalid do not set a timeout.
            test_timeout = 0

        if self.TIMEOUT_SCALING_FACTOR >= 0:
            test_timeout *= self.TIMEOUT_SCALING_FACTOR
        else:
            raise ValueError('TIMEOUT_SCALING_FACTOR value must be >= 0')

        if test_timeout > 0:
            self.useFixture(fixtures.Timeout(test_timeout, gentle=True))
        self.useFixture(fixtures.NestedTempfile())
        self.useFixture(fixtures.TempHomeDir())
        self.useFixture(TranslationFixture())
        self.useFixture(log_fixture.get_logging_handle_error_fixture())

        if os.environ.get('OS_STDOUT_CAPTURE') in _TRUE_VALUES:
            stdout = self.useFixture(fixtures.StringStream('stdout')).stream
            self.useFixture(fixtures.MonkeyPatch('sys.stdout', stdout))
        if os.environ.get('OS_STDERR_CAPTURE') in _TRUE_VALUES:
            stderr = self.useFixture(fixtures.StringStream('stderr')).stream
            self.useFixture(fixtures.MonkeyPatch('sys.stderr', stderr))

        fs = '%(levelname)s [%(name)s] %(message)s'
        self.log_fixture = self.useFixture(fixtures.FakeLogger(
            level=logging.DEBUG,
            format=fs))
        self.useFixture(conf_fixture.ConfFixture(CONF))

        self.messaging_conf = messaging_conffixture.ConfFixture(CONF)
        self.messaging_conf.transport_driver = 'fake'
        self.messaging_conf.response_timeout = 15
        self.useFixture(self.messaging_conf)

        if self.USES_DB:
            global _DB_CACHE
            if not _DB_CACHE:
                _DB_CACHE = Database(session, migration,
                                     sql_connection=CONF.database.connection,
                                     sqlite_db=CONF.database.sqlite_db,
                                     sqlite_clean_db=CONF.sqlite_clean_db)

            self.useFixture(_DB_CACHE)

        mox_fixture = self.useFixture(moxstubout.MoxStubout())
        self.mox = mox_fixture.mox
        self.stubs = mox_fixture.stubs
        self.addCleanup(self._clear_attrs)
        self.useFixture(fixtures.EnvironmentVariable('http_proxy'))
        self.policy = self.useFixture(policy_fixture.PolicyFixture())
        CONF.set_override('fatal_exception_format_errors', True)
dataset/ETHPy150Open openstack/rack/rack/test.py/TestCase.setUp