'Make sure the right chunks get updated when we read a sparse file.'

def testUpdateSparseImageChunks(self):

    with utils.MultiStubber((self.grr_fuse, 'force_sparse_image', True), (self.grr_fuse, 'max_age_before_refresh', datetime.timedelta(seconds=30)), (self.grr_fuse, 'size_threshold', 0)):
        self._testUpdateSparseImageChunks()
