@Test
  public void testStaticImageUrl() {
    WImage image1 = new WImage("/image/x1.gif", "text1");
    WImage image2 = new WImage("/image/x1.gif", "text2");
    WImage image3 = new WImage("/image/x2.gif", "text2");

    WContainer container = new WContainer();
    container.add(image1);
    container.add(image2);
    container.add(image3);

    setActiveContext(createUIContext());
    Assert.assertEquals(
        "Image urls should match for the same image", image1.getTargetUrl(), image2.getTargetUrl());
    Assert.assertFalse(
        "Image urls should differ for different images",
        image1.getTargetUrl().equals(image3.getTargetUrl()));
  }