### Question:
AclBinding { public boolean isUnknown() { return resource.isUnknown() || entry.isUnknown(); } AclBinding(Resource resource, AccessControlEntry entry); boolean isUnknown(); Resource resource(); final AccessControlEntry entry(); AclBindingFilter toFilter(); @Override String toString(); @Override boolean equals(Object o); @Override int hashCode();  }### Answer:
@Test public void testUnknowns() throws Exception { assertFalse(ACL1.isUnknown()); assertFalse(ACL2.isUnknown()); assertFalse(ACL3.isUnknown()); assertFalse(ANY_ANONYMOUS.isUnknown()); assertFalse(ANY_DENY.isUnknown()); assertFalse(ANY_MYTOPIC.isUnknown()); assertTrue(UNKNOWN_ACL.isUnknown()); }