def METHOD_NAME(self):
    decim = 4
    taps = 20 * [0.5, 0.5]
    src_data = 40 * [1, 2, 3, 4]
    expected_data = fir_filter(src_data, taps, decim)
    src = blocks.vector_source_f(src_data)
    op = filter.fir_filter_fff(decim, taps)
    dst = blocks.vector_sink_f()
    self.tb.connect(src, op, dst)
    self.tb.run()
    result_data = dst.data()
    self.assertFloatTuplesAlmostEqual(expected_data, result_data, 5)