testSetValueBeforeRender() {
    select.addItem(new MenuItem('item 1', 1));
    select.addItem(new MenuItem('item 2', 2));
    select.setValue(2);
    assertEquals(2, select.getValue());

    select.decorate(sandboxEl);
    assertEquals(2, select.getValue());
  }
Checks that if a value is set before decorate is called, the value is
preserved after decorate.