def test_boolean_ray_region_no_overlap():
r"""Test to make sure that boolean objects (ray, region, no overlap)
behave the way we expect.
Test non-overlapping ray and region. This also checks that the original
objects don't change as part of constructing the booleans.
"""
ds = fake_amr_ds()
re = ds.box([0.25]*3, [0.75]*3)
ra = ds.ray([0.1]*3, [0.1, 0.1, 0.9])
# Store the original indices
i1 = re["index","morton_index"]
i1.sort()
i2 = ra["index","morton_index"]
i2.sort()
ii = np.concatenate((i1, i2))
ii.sort()
# Make some booleans
bo1 = re & ra
bo2 = re - ra
bo3 = re | ra
bo4 = ds.union([re, ra])
bo5 = ds.intersection([re, ra])
# This makes sure the original containers didn't change.
new_i1 = re["index","morton_index"]
new_i1.sort()
new_i2 = ra["index","morton_index"]
new_i2.sort()
assert_array_equal(new_i1, i1)
assert_array_equal(new_i2, i2)
# Now make sure the indices also behave as we expect.
empty = np.array([])
assert_array_equal(bo1["index","morton_index"], empty)
assert_array_equal(bo5["index","morton_index"], empty)
b2 = bo2["index","morton_index"]
b2.sort()
assert_array_equal(b2, i1 )
b3 = bo3["index","morton_index"]
b3.sort()
assert_array_equal(b3, ii)
b4 = bo4["index","morton_index"]
b4.sort()
b5 = bo5["index","morton_index"]
b5.sort()
assert_array_equal(b3, b4)
bo6 = re ^ ra
b6 = bo6["index", "morton_index"]
b6.sort()
assert_array_equal(b6, np.setxor1d(i1, i2))
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