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"""SkyLine tests.
:Author: Pey Lian Lim
:Organization: Space Telescope Science Institute
"""
from __future__ import absolute_import
import pyfits
from numpy.testing import assert_almost_equal, assert_array_less
from .. import skyline
from .test_util import ROOT_DIR
from .test_shared import resolve_imagename
def test_union_simple():
# Two similar exposures with slight offset and some rotation.
im1 = resolve_imagename(ROOT_DIR, '2chipA.fits')
im2 = resolve_imagename(ROOT_DIR, '2chipB.fits')
skyline1 = skyline.SkyLine(im1)
skyline2 = skyline.SkyLine(im2)
union_1_2 = skyline1.union(skyline2)
union_2_1 = skyline2.union(skyline1)
assert_almost_equal(union_1_2.area(), union_2_1.area())
for m in union_1_2.members:
assert m in union_2_1.members
assert len(union_1_2.members) == 4
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