erse', function() {
          container.classList.add('vertical-reverse');
          assert.isTrue(positionEquals(container, 0, 150, 0, 300), "container position ok");
          // vertically, |c3| |c2| |c1|
          assert.isTrue(positionEquals(c1, 100, 150, 0, 50), "child 1 position ok");
          assert.isTrue(positionEquals(c2, 50, 100, 0, 50), "child 2 position ok");
          assert.isTrue(positionEquals(c3, 0, 50, 0, 50), "child 3 position ok");
        });

        test('layout-wrap', function() {