GameTests.cs

using System;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using FizzBuzz;

namespace FizzBuzzTests {

    [TestClass]
    public class GameTest {

        [TestMethod]
        public void Return_One_For_One() {
            var sut = new Game();
            Assert.AreEqual("1", sut.Play(1));
        }

        [TestMethod]
        public void Return_Two_For_Two() {
            var sut = new Game();
            Assert.AreEqual("2", sut.Play(2));
        }

        [TestMethod]
        public void Return_Fizz_For_Multiples_Of_Three() {
            var sut = new Game();
            Assert.AreEqual("fizz", sut.Play(3));
        }

        [TestMethod]
        public void Return_Fizz_For_Multiples_Of_Three_Refactored() {
            var sut = new Game();
            var multiplesOfThree = new int[] { 3, 6, 9, 12, 18, 21, 24, 27, 33, 36, 39, 42, 48, 51, 54, 57 };

            for (int i = 0; i < multiplesOfThree.Length; i++) {
                Assert.AreEqual("fizz", sut.Play(multiplesOfThree[i]));
            }
        }

        [TestMethod]
        public void Return_Buzz_For_Multiples_Of_Five() {
            var sut = new Game();
            var multiplesOfFive = new int[] { 5, 10, 20, 25, 35, 40, 50, 55 };

            for (int i = 0; i < multiplesOfFive.Length; i++) {
                Assert.AreEqual("buzz", sut.Play(multiplesOfFive[i]));
            }
        }

        [TestMethod]
        public void Return_FizzBuzz_For_Multiples_Of_Three_And_Five() {
            var sut = new Game();
            var multiplesOfThreeAndFive = new int[] { 15, 30, 45, 60 };

            for (int i = 0; i < multiplesOfThreeAndFive.Length; i++) {
                Assert.AreEqual("fizzbuzz", sut.Play(multiplesOfThreeAndFive[i]));
            }
        }
    }
}