@Test
  public void testInvalidate_SpringUnInvalidate() {
    String ret = bean.getProp();
    want.string(ret).isEqualTo("unset");

    SpringAfterInit.initProp = "invalid";
    spring.invalidate();
  }
 @Test
 public void testInvalidate_SpringINvalidate() {
   String ret = bean.getProp();
   want.string(ret).isEqualTo("invalid");
 }