@Test
public void clipWidget() {

    PDAnnotationWidget widget = new PDAnnotationWidget(dictionary);
    SignatureClipper.clipSignatures(Arrays.asList(widget));
    assertFalse(widget.getCOSObject().containsKey(COSName.V));
    assertFalse(widget.getCOSObject().containsKey(COSName.SV));
    assertFalse(widget.getCOSObject().containsKey(COSName.LOCK));
}