def METHOD_NAME(self):
    decim = 1
    taps = 20 * [0.5, 0.5]
    src_data = 40 * [1 + 1j, 2 + 2j, 3 + 3j, 4 + 4j]
    expected_data = fir_filter(src_data, taps, decim)
    src = blocks.vector_source_c(src_data)
    op = filter.fir_filter_ccf(decim, taps)
    dst = blocks.vector_sink_c()
    self.tb.connect(src, op, dst)
    self.tb.run()
    result_data = dst.data()
    self.assertComplexTuplesAlmostEqual(expected_data, result_data, 5)