FizzBuzz: From DojoPuzzles

FizzBuzz.cs

/*
 * FizzBuzz
 * http://dojopuzzles.com/problemas/exibe/fizzbuzz/
 */

using System;
using System.Text;

namespace FizzBuzz
{
    class FizzBuzz
    {
        public string Execute(int number)
        {
            var result  = new StringBuilder();

            if ( number % 3 == 0 )
                result.Append("Fizz");
            
            if ( number % 5 == 0 )
                result.Append("Buzz");

            if (result.ToString().Equals(string.Empty))
                result.Append(number.ToString());

            return result.ToString();
        }

        public static void Main(string[] args)
        {
            var fb = new FizzBuzz();

            for (int i = 1; i <= 100; i++)
                Console.WriteLine(fb.Execute(i));
        }
    }
}

FizzBuzzTest.cs

/*
 * FizzBuzz
 * http://dojopuzzles.com/problemas/exibe/fizzbuzz/
 */

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

namespace FizzBuzz
{
    [TestClass]
    public class FizzBuzzTest
    {
        private FizzBuzz fizzbuzz;

        [TestInitialize]
        public void Initialize()
        {
            fizzbuzz = new FizzBuzz();
        }

        [TestCleanup]
        public void CleanUp()
        {
            fizzbuzz = null;
        }

        [TestMethod]
        public void ShouldBeFizz()
        {
            Assert.AreEqual("Fizz", fizzbuzz.Execute(3));
        }

        [TestMethod]
        public void ShouldBeBuzz()
        {
            Assert.AreEqual("Buzz", fizzbuzz.Execute(5));
        }

        [TestMethod]
        public void ShouldBeFizzBuzz()
        {
            Assert.AreEqual("FizzBuzz", fizzbuzz.Execute(15));
        }
        
        [TestMethod]
        public void ShouldBeTheNumber()
        {
            Assert.AreEqual("7", fizzbuzz.Execute(7));
        }

        [TestMethod]
        public void ShouldBeFizzWithThirtyNine()
        {
            Assert.AreEqual("Fizz", fizzbuzz.Execute(39));
        }

        [TestMethod]
        public void ShouldBeBuzzWithFifty()
        {
            Assert.AreEqual("Buzz", fizzbuzz.Execute(50));
        }
    }
}