def test_wcs_1d(wcs_1d_l):
ec = ExtraCoords(wcs=wcs_1d_l, mapping=(0, ))
assert ec.keys() == ('spectral', )
assert ec.mapping == (0, )
assert ec.wcs is wcs_1d_l
subec = ec[1:]
assert ec.keys() == ('spectral', )
assert ec.mapping == (0, )
assert np.allclose(ec.wcs.pixel_to_world_values(1),
subec.wcs.pixel_to_world_values(1))
subec = ec[0]
assert subec.wcs is None
def test_empty_ec(wcs_1d_l):
ec = ExtraCoords()
# Test slice of an empty EC
assert ec[0].wcs is None
assert ec.mapping == tuple()
assert ec.wcs is None
assert ec.keys() == tuple()
ec.wcs = wcs_1d_l
assert ec.wcs is wcs_1d_l
ec.mapping = (0, )
assert ec.mapping == (0, )
