assertFalse(pips.isEmpty());
pips = pipr.get(UNKNOWN);
assertNotNull(pips);
assertTrue(pips.isEmpty());
DomainExpressionBuilderRegistry debr = bus.getExtension(DomainExpressionBuilderRegistry.class);
assertNotNull(debr);
DomainExpressionBuilder deb = debr.get(KNOWN_DOMAIN_EXPR_TYPE);
assertNotNull(deb);
deb = debr.get(UNKNOWN);
assertNull(deb);
PolicyEngine pe = bus.getExtension(PolicyEngine.class);
assertNotNull(pe);
PolicyEngineImpl engine = (PolicyEngineImpl)pe;