def test_intersection(self):
s = Sphere(Point(0, 0, 2), 2)
l = Line(Point(-1, 0, 2), Point(1, 0, 2))
assert s.contains(Point(0, 0, 0))
assert s.intersect(l) == [Point(-2, 0, 2), Point(2, 0, 2)]
assert s.intersect(l-Point(0, 0, 2)) == [Point(0, 0, 0)]
s = Sphere(Point(0, 0, 0, 2), 2)
l = Line(Point(-1, 0, 0, 2), Point(1, 0, 0, 2))
assert s.contains(Point(0, 0, 0, 0))
assert s.intersect(l) == [Point(2, 0, 0, 2), Point(-2, 0, 0, 2)]
def test_intersect(self):
s = Sphere(Point(0, 0, 2), 2)
l = Line(Point(-1, 0, 2), Point(1, 0, 2))
assert s.contains(Point(0, 0, 0))
assert s.intersect(l) == [Point(-2, 0, 2), Point(2, 0, 2)]
assert s.intersect(l - Point(0, 0, 2)) == [Point(0, 0, 0)]
l = LineCollection([Line(Point(-1, 0, 2), Point(1, 0, 2)), Line(Point(0, 0, 0), Point(0, 0, 2))])
assert s.intersect(l) == [PointCollection([Point(-2, 0, 2), Point(0, 0, 0)]),
PointCollection([Point(2, 0, 2), Point(0, 0, 4)])]
s = Sphere(Point(0, 0, 0, 2), 2)
l = Line(Point(-1, 0, 0, 2), Point(1, 0, 0, 2))
assert s.contains(Point(0, 0, 0, 0))
assert s.intersect(l) == [Point(2, 0, 0, 2), Point(-2, 0, 0, 2)]