}
private void testContentStreams( PDDocument doc, PDFieldTreeNode field, String expected ) throws Exception
{
PDAnnotationWidget widget = field.getWidget();
PDAppearanceEntry normalAppearance = widget.getAppearance().getNormalAppearance();
PDAppearanceStream appearanceStream = normalAppearance.getAppearanceStream();
COSStream actual = appearanceStream.getCOSStream();
List<Object> actualTokens = getStreamTokens( doc, actual );
List<Object> expectedTokens = getStreamTokens( doc, expected );
assertEquals( actualTokens.size(), expectedTokens.size() );