public void testUnique() {
SelectorEngineImpl selSizz = new SelectorEngineSizzleGwt();
$(e).html(getTestContent());
JsArray<Element> a;
a = selSizz.select("p", e).cast();
int n = a.length();
assertTrue(n > 300);
for (int i=0; i<n; i++) {
a.push(a.get(i));
}