public void emptyContent() { FilterPolicy filter = new FilterPolicy() { BlockedPhrases = new List <PhraseFilter>() { new PhraseFilter() { Type = BlockPhraseType.WORDCONTAINING, Phrase = "bad" }, new PhraseFilter() { Type = BlockPhraseType.REGEX, Phrase = "wor[dk]" } } }; Assert.AreEqual(null, filter.findBlockingPhrase("", BlockPhraseScope.ANY, out _)); }