adapter.put(ACOH1_HEADER_QNAME, acoh1ContentList);
adapter.put(ACOH2_HEADER_QNAME, acoh2ContentList);
adapter.remove(ACOH1_HEADER_QNAME);
// testing "keySet()" method
Set<QName> keyset = adapter.keySet();
assertTrue(!keyset.contains(ACOH1_HEADER_QNAME));
assertTrue(keyset.contains(ACOH2_HEADER_QNAME));
// re-check to make sure nothing got corrupted
assertTrue(adapter.get(ACOH2_HEADER_QNAME).get(0).equals(acoh2));