def METHOD_NAME(self):
    box1 = AxisAlignedBox(minimum = Vector(-10.0, -10.0, -10.0), maximum = Vector(0.0, 0.0, 0.0))
    box2 = AxisAlignedBox(minimum = Vector(0.0, 0.0, 0.0), maximum = Vector(10.0, 10.0, 10.0))
    joined = box1 + box2
    self.assertEqual(Vector(-10.0, -10.0, -10.0), joined.minimum)
    self.assertEqual(Vector(10.0, 10.0, 10.0), joined.maximum)
    self.assertTrue(joined.isValid())