testDecorateInternalForHiddenElement() {
    sandbox.innerHTML = '<div id="foo" style="display:none">Hello!</div>';
    const foo = dom.getElement('foo');
    control.decorate(foo);
    assertEquals(
        'Decorated control\'s element must have expected value', foo,
        control.getElement());
    assertTrue(
        'Element must be unselectable',
        style.isUnselectable(control.getElement()));
    assertFalse('Control must be hidden', control.isVisible());
  }
Tests {@link Control#decorateInternal} with a hidden element.