public void ReturnsWordsWithSpecifiedLength() { string word1 = "word1"; string word2 = "word2"; string word3 = "word"; repository.Add(word1); repository.Add(word2); repository.Add(word3); List <string> words = new List <string>(repository.GetWordsWithLength(5)); Assert.AreEqual(2, words.Count); Assert.IsTrue(words.Contains(word1)); Assert.IsTrue(words.Contains(word2)); }