def test_fiducial_roudtrip(fullstack_icrs, fullstack_fiducial_altaz):
 aacoo = fullstack_icrs.transform_to(fullstack_fiducial_altaz)
 icrs2 = aacoo.transform_to(ICRS)
 npt.assert_allclose(fullstack_icrs.ra.deg, icrs2.ra.deg)
 npt.assert_allclose(fullstack_icrs.dec.deg, icrs2.dec.deg)

def test_fiducial_roudtrip ( fullstack_icrs , fullstack_fiducial_altaz ) : aacoo = fullstack_icrs . transform_to ( fullstack_fiducial_altaz ) icrs2 = aacoo . transform_to ( ICRS ) npt . assert_allclose ( fullstack_icrs . ra . deg , icrs2 . ra . deg ) npt . assert_allclose ( fullstack_icrs . dec . deg , icrs2 . dec . deg )
test the full transform from icrs <-> altaz .