def METHOD_NAME(self):
    """Check that accumulating no spans leaves header intact"""
    self.shape_settings = [-1, 1, 2]
    with bfp.Pipeline() as pipeline:
        c_data = blocks.sigproc.read_sigproc([self.fil_file], self.gulp_nframe)
        g_data = blocks.copy(c_data, space='cuda')
        call_data = CallbackBlock(
                g_data, self.check_sequence_before, self.check_data_before)
        accumulated = blocks.accumulate(g_data, 1)
        call_data = CallbackBlock(
                accumulated, self.check_sequence_after, self.check_data_after)
        pipeline.run()