@SuppressWarnings("EmptyCatchBlock")
public void testUnmodifiability() {
TreeSet<Integer> mod = Sets.newTreeSet();
mod.add(1);
mod.add(2);
mod.add(3);
NavigableSet<Integer> unmod = new UnmodifiableNavigableSet<Integer>(mod);
mod.add(4);
assertTrue(unmod.contains(4));
assertTrue(unmod.descendingSet().contains(4));
ensureNotDirectlyModifiable(unmod);
ensureNotDirectlyModifiable(unmod.descendingSet());
ensureNotDirectlyModifiable(unmod.headSet(2));
ensureNotDirectlyModifiable(unmod.headSet(2, true));
ensureNotDirectlyModifiable(unmod.tailSet(2));
ensureNotDirectlyModifiable(unmod.tailSet(2, true));
ensureNotDirectlyModifiable(unmod.subSet(1, 3));
ensureNotDirectlyModifiable(unmod.subSet(1, true, 3, true));
NavigableSet<Integer> reverse = unmod.descendingSet();
try {
reverse.add(4);
fail("UnsupportedOperationException expected");
} catch (UnsupportedOperationException expected) {
}
try {
reverse.addAll(Collections.singleton(4));
fail("UnsupportedOperationException expected");
} catch (UnsupportedOperationException expected) {
}
try {
reverse.remove(4);
fail("UnsupportedOperationException expected");
} catch (UnsupportedOperationException expected) {
}
}
