// Don't (re)create HashSets if we've already setWholeSubtreeInvalid.
TEST(InvalidationSetTest, SubtreeInvalid_AddAfter)
{
    RefPtrWillBeRawPtr<InvalidationSet> set = InvalidationSet::create();
    set->setWholeSubtreeInvalid();
    set->addTagName("a");

    ASSERT_TRUE(set->isEmpty());
}