makeTestContainer(color: 0,
          child: makeVBox(children: [
            makeHBox(children: [
              makeTestElement(layoutProblem: makeFixedSizeLayoutProblem(dimensions: new Vec2(200.0, 200.0)), color: 1),
              makeTestElement(layoutProblem: unconstrainedLayoutProblem, color: 3),
              makeTestElement(layoutProblem: makeFixedSizeLayoutProblem(dimensions: new Vec2(200.0, 200.0)), color: 2),
            ]),
            makeHBox(children: [
              makeTestElement(layoutProblem: unconstrainedLayoutProblem, color: 1),
              makeTestElement(layoutProblem: unconstrainedLayoutProblem, color: 2),
            ]),
          ]))