FizzBuzz.FizzBuzzer.AddRule C# (CSharp) Method

        public void AddRule(int number, string word)
        {
            Rules.Add(number, word);
        }

        public void PassDivisibleBy2And3And5And7GetCoconutFizzBuzzBanana()
        {
            var fizzBuzz = new FizzBuzzer();
            fizzBuzz.AddRule(2, "Coconut");
            fizzBuzz.AddRule(7, "Banana");
            var result = fizzBuzz.ToString(210);

            Assert.AreEqual("Coconut Fizz Buzz Banana", result);
        }