/** Prepare the test environment. */
  protected void setUp() throws Exception {
    ConfigManager.getInstance().add(StressHelper.CONFIG_FILE);

    Constructor ctor = DiagramView.class.getDeclaredConstructor(Diagram.class, DiagramViewer.class);
    ctor.setAccessible(true);
    DiagramView diagramView =
        (DiagramView)
            ctor.newInstance(new Object[] {StressHelper.createDiagram(), new DiagramViewer()});

    // insert 100 nodes into diagramView
    for (int i = 0; i < 100; i++) {
      diagramView.add(
          new MockNode(
              new GraphNode(),
              new Point(i * 10, i * 10),
              new Rectangle(0, 0, 100, 100),
              new ArrayList<SelectionCornerType>()));
    }

    handler = new SelectionHandler();
    event = new SelectionEvent(diagramView, new Rectangle(0, 0, 1000, 1000));
  }