Assert.assertTrue(set.bundle(b1));
Assert.assertFalse(set.bundle(b2));
Assert.assertTrue(set.bundle(b3));
Assert.assertTrue(set.bundle(b4));
env.worldPush();
set.swap(b3); // b3 is now fixed
int b5 = set.add();
Assert.assertTrue(set.bundle(b1));
Assert.assertFalse(set.bundle(b2));