@Test
public void clipWidgetNonSign() {

    dictionary.setItem(COSName.FT, COSName.BTN);
    PDAnnotationWidget widget = new PDAnnotationWidget(dictionary);
    SignatureClipper.clipSignatures(Arrays.asList(widget));
    assertTrue(widget.getCOSObject().containsKey(COSName.V));
    assertTrue(widget.getCOSObject().containsKey(COSName.SV));
    assertTrue(widget.getCOSObject().containsKey(COSName.LOCK));
}