How to use the queuelib.tests.test_queue.FifoDiskQueueTest function in queuelib

from scrapy.squeues import MarshalFifoDiskQueue, MarshalLifoDiskQueue, PickleFifoDiskQueue, PickleLifoDiskQueue
from scrapy.item import Item, Field
from scrapy.http import Request
from scrapy.loader import ItemLoader

class TestItem(Item):
    name = Field()

def _test_procesor(x):
    return x + x

class TestLoader(ItemLoader):
    default_item_class = TestItem
    name_out = staticmethod(_test_procesor)

class MarshalFifoDiskQueueTest(t.FifoDiskQueueTest):

    chunksize = 100000

    def queue(self):
        return MarshalFifoDiskQueue(self.qpath, chunksize=self.chunksize)

    def test_serialize(self):
        q = self.queue()
        q.push('a')
        q.push(123)
        q.push({'a': 'dict'})
        self.assertEqual(q.pop(), 'a')
        self.assertEqual(q.pop(), 123)
        self.assertEqual(q.pop(), {'a': 'dict'})

    def test_nonserializable_object(self):

except Exception:
        # Trigger Twisted bug #7989
        import twisted.persisted.styles  # NOQA
        self.assertRaises(ValueError, q.push, lambda x: x)
    else:
        # Use a different unpickleable object
        class A(object): pass
        a = A()
        a.__reduce__ = a.__reduce_ex__ = None
        self.assertRaises(ValueError, q.push, a)
    # Selectors should fail (lxml.html.HtmlElement objects can't be pickled)
    sel = Selector(text='<p>some text</p>')
    self.assertRaises(ValueError, q.push, sel)


class MarshalFifoDiskQueueTest(t.FifoDiskQueueTest):

    chunksize = 100000

    def queue(self):
        return MarshalFifoDiskQueue(self.qpath, chunksize=self.chunksize)

    def test_serialize(self):
        q = self.queue()
        q.push('a')
        q.push(123)
        q.push({'a': 'dict'})
        self.assertEqual(q.pop(), 'a')
        self.assertEqual(q.pop(), 123)
        self.assertEqual(q.pop(), {'a': 'dict'})

    test_nonserializable_object = nonserializable_object_test