def METHOD_NAME(cls):
    time = Time('2010-11-12T13:14:15')
    cls.nchan = 2
    cls.header0 = mark4.Mark4Header.fromvalues(
        time=time, ntrack=16, nchan=cls.nchan, fanout=4)
    cls.data = np.zeros((2*cls.header0.frame_nbytes, 2))
    cls.data.reshape(-1, 4, 2)[160:] = [
        [-1, 1], [-3, 3], [1, -1], [3, -3]]
    cls.sample_rate = 100 * u.kHz
    cls.kwargs = dict(sample_rate=cls.sample_rate,
                      ref_time=time)