GoodNunitTestExample.cs

using NUnit.Framework;

namespace Project
{
  public static class FizzBuzz
  {
    public static string Compute( int inputNumber )
    {
      if ( inputNumber % 3 == 0 && inputNumber % 5 == 0 )
        return "FizzBuzz";
      if ( inputNumber % 3 == 0 )
        return "Fizz";
      if ( inputNumber % 5 == 0 )
        return "Buzz";
      return inputNumber.ToString();
    }
  }

  public class UnitTest1
  {
    [TestCase( 1, ExpectedResult = "1")]
    [TestCase( 2, ExpectedResult = "2")]
    [TestCase( 3, ExpectedResult = "Fizz")]
    [TestCase( 5, ExpectedResult = "Buzz")]
    [TestCase( 6, ExpectedResult = "Fizz")]
    [TestCase( 10, ExpectedResult = "Buzz")]
    [TestCase( 15, ExpectedResult = "FizzBuzz" )]
    public string TestFizzBuzz( int input )
    {
      return FizzBuzz.Compute( input );
    }
  }
}