k");
          assert.isTrue(positionEquals(c4, center, center+50, 50, 100), "child 4 position ok");
          assert.isTrue(positionEquals(c5, 225, 275, 0, 50), "child 5 position ok");
        });
      });

      suite('positioning', function() {
        var container;

        setup(function() {
          container = fixture('positioning');
          container.classList.add('tall');
        });

        test('layout-fit', function() {
          c1.classList.add('fit');
          assert.isTrue(positionEqu