public void ShouldCountCitiesStartsWithLetter()
        {
            CityListManager listManager = new CityListManager();

            var city1 = new City("Karpacz");
            var city2 = new City("Wieleń");
            var city3 = new City("Warszawa");

            listManager.AddElement(city1);
            listManager.AddElement(city2);
            listManager.AddElement(city3);

            var result = listManager.CountElementsStartWithLetter("W");

            Assert.AreEqual(result, 2);
        }
        public void ShouldCountCitiesStartsWithLetter()
        {
            CityListManager listManager = new CityListManager();

            var city1 = new City("Karpacz");
            var city2 = new City("Wieleń");
            var city3 = new City("Warszawa");

            listManager.AddElement(city1);
            listManager.AddElement(city2);
            listManager.AddElement(city3);

            var result = listManager.CountElementsStartWithLetter("W");

            Assert.AreEqual(result, 2);
        }