def test_bisect_variable(self):
b = Box([x, y, z])
(b1, b2) = b.bisect(x)
self.assertEqual(b1[x].ub(), 0)
self.assertEqual(b2[x].lb(), 0)
def test_bisect_int(self):
b = Box([x, y, z])
(b1, b2) = b.bisect(0)
self.assertEqual(b1[0].ub(), 0)
self.assertEqual(b2[0].lb(), 0)