private void validateRewritten(String content, Uri base,
LinkRewriter linkRewriter, String expected) {
MutableContent mc = new MutableContent(null, content);
HttpRequest request = new HttpRequest(base);
rewriter.rewrite(request,
new HttpResponseBuilder().setHeader("Content-Type", "text/css").create(), mc);
assertEquals(StringUtils.deleteWhitespace(expected),
StringUtils.deleteWhitespace(mc.getContent()));
}