ssList.add('end-justified');
          assert.isTrue(positionEquals(container, 0, 50, 0, 300), "container position ok");
          assert.isTrue(positionEquals(c1, 0, 50, 250, 300), "child 1 position ok");
        });

        test('layout-center-justified', function() {
          container.classList.add('center-justified');
          assert.isTrue(positionEquals(container, 0, 50, 0, 300), "container position ok");
          var center = (300 - 50) / 2;
          assert.isTrue(positionEquals(c1, 0, 50, cent