// add entry without restr. -> must succeed
assertTrue(pt.addAccessControlEntry(testPrincipal, writePriv));
assertEquals(1, pt.getAccessControlEntries().length);
// ... again -> no modification.
assertFalse(pt.addAccessControlEntry(testPrincipal, writePriv));
assertEquals(1, pt.getAccessControlEntries().length);
// ... again using different method -> no modification.
assertFalse(pt.addEntry(testPrincipal, writePriv, true));
assertEquals(1, pt.getAccessControlEntries().length);