def METHOD_NAME(self, testdata):
    """
    Unpacks data and compares them to data unpacked by Madagascar.
    """
    # This file has the same data as 1.sgy_first_trace.
    file = testdata['1.su_first_trace']
    data_file = testdata['1.sgy_first_trace.npy']
    su = _read_su(file)
    data = su.traces[0].data
    # The data is written as integer so it is also converted to float32.
    correct_data = np.require(np.load(data_file).ravel(), np.float32)
    # Compare both.
    np.testing.assert_array_equal(correct_data, data)