def test_getNormal_negative_values(self):
a = Vector(-3, -1, -2)
c = a.getNormal()
assert c.length() == 1
def test_getNormal_mixed_values(self):
a = Vector(-2, 3, 0)
c = a.getNormal()
assert c.length() == 1
def test_getNormal_positive_values(self):
a = Vector(1, 2, 3)
c = a.getNormal()
assert c.length() == 1
