'Tests inserting a Simple GroupsHDU to the beginning of an HDUList
that that already contains a GroupsHDU.'

@raises(ValueError)
def test_insert_groupshdu_to_begin_of_hdulist_with_groupshdu(self):

    hdul = fits.HDUList()
    hdu = fits.GroupsHDU()
    hdul.insert(0, hdu)
    hdul.insert(0, hdu)
