HashAttributeSet testSet = new HashAttributeSet( att1 );
// test basic functionality
harness.check(testSet.containsValue(att1), true, "containsValue");
harness.check(testSet.containsKey(att1.getCategory()),
true, "containsKey");
harness.check(testSet.remove(att1), true, "remove");
harness.check(testSet.isEmpty(), true, "isEmpty");
harness.check(testSet.add(att1), true, "add");
harness.check(testSet.add(att1), false, "re-add");