def METHOD_NAME(self):
    expected_result = self._vector[100:100 + 600]
    src = blocks.file_source(
        gr.sizeof_float,
        self._datafilename,
        offset=100,
        len=600)
    snk = blocks.vector_sink_f()
    self.tb.connect(src, snk)
    self.tb.run()
    result_data = snk.data()
    self.assertFloatTuplesAlmostEqual(expected_result, result_data)
    self.assertEqual(len(snk.tags()), 0)