static Window createWindow(
      final Capabilities caps,
      final int x,
      final int y,
      final int width,
      final int height,
      final boolean onscreen,
      final boolean undecorated)
      throws InterruptedException {
    final boolean userPos = x >= 0 && y >= 0; // user has specified a position

    Assert.assertNotNull(caps);
    caps.setOnscreen(onscreen);
    // System.out.println("Requested: "+caps);

    //
    // Create native windowing resources .. X11/Win/OSX
    //
    final Window window = NewtFactory.createWindow(caps);
    Assert.assertNotNull(window);
    final Screen screen = window.getScreen();
    final Display display = screen.getDisplay();
    window.setUndecorated(onscreen && undecorated);
    if (userPos) {
      window.setPosition(x, y);
    }
    window.setSize(width, height);
    Assert.assertEquals(false, window.isNativeValid());
    Assert.assertEquals(false, window.isVisible());
    window.setVisible(true);
    // System.err.println("************* Created: "+window);

    Assert.assertEquals(true, display.isNativeValid());
    Assert.assertEquals(true, screen.isNativeValid());
    Assert.assertEquals(true, window.isVisible());
    Assert.assertEquals(true, window.isNativeValid());
    Assert.assertEquals(width, window.getWidth());
    Assert.assertEquals(height, window.getHeight());

    /**
     * we don't sync on position - unreliable test Point p0 = window.getLocationOnScreen(null);
     * Assert.assertEquals(p0.getX(), window.getX()); Assert.assertEquals(p0.getY(), window.getY());
     * if(userPos) { Assert.assertEquals(x, window.getX()); Assert.assertEquals(y, window.getY()); }
     */
    final CapabilitiesImmutable chosenCapabilities =
        window.getGraphicsConfiguration().getChosenCapabilities();
    Assert.assertNotNull(chosenCapabilities);
    Assert.assertTrue(chosenCapabilities.getGreenBits() >= 5);
    Assert.assertTrue(chosenCapabilities.getBlueBits() >= 5);
    Assert.assertTrue(chosenCapabilities.getRedBits() >= 5);
    Assert.assertEquals(chosenCapabilities.isOnscreen(), onscreen);

    return window;
  }