def test_cross_product_requires_length_3(self):
vector1 = Vector(-6, 8)
vector2 = Mock(Vector)
vector2._values = [4, 9, 2]
with self.assertRaises(ValueError):
vector1.cross(vector2)
vector1 = Vector(3, -3, 1)
vector2._values = [4, 9]
with self.assertRaises(ValueError):
vector1.cross(vector2)
def test_cross_product_requires_vector(self):
vector1 = Vector(-6, -8)
with self.assertRaises(TypeError):
vector1.cross("vector")
def test_can_get_cross_product(self):
vector1 = Vector(3, -3, 1)
vector2 = Mock(Vector)
vector2._values = [4, 9, 2]
self.assertEqual(vector1.cross(vector2)._values, [-15, -2, 39])