3_MethodsTest.cs

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

namespace MoqKoans
{
	[TestClass]
	public class Moq3_MethodsTest : Koan
	{
		// This is an interface that we will be mocking.
		public interface IVolume
		{
			int Louder(int amount);
			int Quieter(int amount);
			string CurrentVolume();
		}

		[TestMethod]
		public void UsingWhatYouHaveLearned_CreateACompletelyFunctionalIVolumeMock()
		{
			// Use Moq to create a Mock<IVolume> instance.
			// Have the internal volume start at 50.
			// The Louder and Quieter methods should incrament/decrament the internal volume by the passed in amount.
			// The Louder and Quieter methods should return the internal volume level after the change.
			// For example if the internal volume was 10, and .Quieter(2) is called, then it should return 8.
			// The volume should stay in the range 0 to 100. It should not go below 0 or over 100.
			// If .Louder(999) is called, then the volume should be at 100.
			// The CurrentVolume() methoud should always return the internal volume level, as a string.
			// If a negative number is passed to either Louder or Quieter, then it should throw an ArgumentOutOfRangeException.

			var mock = new ___();
			// ...setup your mock here...

			// Do not change these Asserts. Your setup mock should make all of these pass the way they are.
			var volume = mock.Object;
			Assert.AreEqual("50", volume.CurrentVolume());
			Assert.AreEqual(40, volume.Quieter(10));
			Assert.AreEqual("40", volume.CurrentVolume());
			Assert.AreEqual(60, volume.Louder(20));
			Assert.AreEqual("60", volume.CurrentVolume());
			Assert.AreEqual(0, volume.Quieter(1000));
			Assert.AreEqual("0", volume.CurrentVolume());
			Assert.AreEqual(100, volume.Louder(1000));
			Assert.AreEqual("100", volume.CurrentVolume());
			try
			{
				volume.Louder(-1);
				Assert.Fail("Louder did not throw an exception on a negative input.");
			}
			catch (Exception ex)
			{
				Assert.IsInstanceOfType(ex, typeof(ArgumentOutOfRangeException));
			}
			try
			{
				volume.Quieter(-1);
				Assert.Fail("Quieter did not throw an exception on a negative input.");
			}
			catch (Exception ex)
			{
				Assert.IsInstanceOfType(ex, typeof(ArgumentOutOfRangeException));
			}
		}
	}
}