@SuppressWarnings("EmptyCatchBlock")
static void ensureNotDirectlyModifiable(NavigableSet<Integer> unmod) {
try {
unmod.add(4);
fail("UnsupportedOperationException expected");
} catch (UnsupportedOperationException expected) {
}
try {
unmod.remove(4);
fail("UnsupportedOperationException expected");
} catch (UnsupportedOperationException expected) {
}
try {
unmod.addAll(Collections.singleton(4));
fail("UnsupportedOperationException expected");
} catch (UnsupportedOperationException expected) {
}
try {
unmod.pollFirst();
fail("UnsupportedOperationException expected");
} catch (UnsupportedOperationException expected) {
}
try {
unmod.pollLast();
fail("UnsupportedOperationException expected");
} catch (UnsupportedOperationException expected) {
}
try {
Iterator<Integer> iterator = unmod.iterator();
iterator.next();
iterator.remove();
fail("UnsupportedOperationException expected");
} catch (UnsupportedOperationException expected) {
}
try {
Iterator<Integer> iterator = unmod.descendingIterator();
iterator.next();
iterator.remove();
fail("UnsupportedOperationException expected");
} catch (UnsupportedOperationException expected) {
}
}
