});

        test('layout-flex, layout-flex-2, layout-flex-3 in a vertical layout', function() {
          container.classList.add('vertical');
          container.classList.add('tall');
          c1.classList.add('flex');
          c2.classList.add('flex-2');
          c3.classList.add('flex-3');
          assert.isTrue(positionEquals(container, 0, 300, 0, 300), "container position ok");
          // vertically, |c1| | c2 | |  c3  |
          assert.isTrue(positionEquals(c1, 0, 50, 0, 50), "child 1 positio