def test_plate_scale(): mm = 1.5*u.mm asec = 30*u.arcsec platescale = 20*u.arcsec/u.mm platescale2 = 0.05*u.mm/u.arcsec assert_quantity_allclose(mm.to(u.arcsec, u.plate_scale(platescale)), asec) assert_quantity_allclose(mm.to(u.arcmin, u.plate_scale(platescale)), asec) assert_quantity_allclose(mm.to(u.arcsec, u.plate_scale(platescale2)), asec) assert_quantity_allclose(mm.to(u.arcmin, u.plate_scale(platescale2)), asec) assert_quantity_allclose(asec.to(u.mm, u.plate_scale(platescale)), mm) assert_quantity_allclose(asec.to(u.mm, u.plate_scale(platescale2)), mm)