def test_wcs_setter(wcs_1d_l, wave_lut):
ec = ExtraCoords(wcs=wcs_1d_l, mapping=(0, ))
with pytest.raises(AttributeError):
ec.wcs = None
ec = ExtraCoords()
ec.mapping = (1, )
with pytest.raises(ValueError):
ec.wcs = wcs_1d_l
ec = ExtraCoords()
ec.add_coordinate("wave", (0, ), wave_lut)
with pytest.raises(AttributeError):
ec.wcs = 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, )
def test_exceptions(wcs_1d_l):
# Test unable to specify inconsistent dimensions and tables
with pytest.raises(ValueError):
ExtraCoords.from_lookup_tables(None, (0,), (0, 0))
# Test unable to add to WCS EC
ec = ExtraCoords()
ec.wcs = wcs_1d_l
ec.mapping = (0,)
with pytest.raises(ValueError):
ec.add(None, 0, None)
with pytest.raises(KeyError):
ExtraCoords()['empty']
def test_wcs_1d(wcs_1d_l):
ec = ExtraCoords()
ec.wcs = wcs_1d_l
ec.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
