@Test
public void clipNonWidget() {

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