public void GetByIdElements_Success() { var dic = new SynchronizedDictionary<int, string, string>(); dic.Add(1, "Иванов", "value_1"); dic.Add(2, "Иванов", "value_2"); dic.Add(5, "Иванов", "value_3"); dic.Add(5, "Петров", "value_4"); var elementsById = dic.GetById(5); Assert.AreEqual(2, elementsById.Count); }