def test_hit3(self):
s = Sphere()
i1 = Intersection(-2, s)
i2 = Intersection(-1, s)
xs = Intersections([i1, i2])
i = xs.hit()
self.assertTrue(i == None)
def test_hit1(self):
s = Sphere()
i1 = Intersection(1, s)
i2 = Intersection(2, s)
xs = Intersections([i1, i2])
i = xs.hit()
self.assertTrue(i == i1)
def test_hit4(self):
s = Sphere()
i1 = Intersection(5, s)
i2 = Intersection(7, s)
i3 = Intersection(-3, s)
i4 = Intersection(2, s)
xs = Intersections([i1, i2, i3, i4])
i = xs.hit()
self.assertTrue(i == i4)