'makeProducer when the Range header requests a single byte range
returns an instance of MultipleRangeStaticProducer.'

def test_multipleRangeGivesMultipleRangeStaticProducer(self):

    request = DummyRequest([])
    request.requestHeaders.addRawHeader('range', 'bytes=1-3,5-6')
    resource = self.makeResourceWithContent('abcdef')
    with resource.openForReading() as file:
        producer = resource.makeProducer(request, file)
        self.assertIsInstance(producer, static.MultipleRangeStaticProducer)
