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Using a Virtual Factory Method with NMock to help NUnit Testing

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  1. using System;
  2. using System.Collections.Generic;
  3. using System.Text;
  4. using NMock2;
  5. using NUnit.Framework;
  6.  
  7. namespace NUnitSandbox
  8. {
  9.     public interface IThingInterface
  10.     {
  11.         int GetThingNumber(); 
  12.     }
  13.     public class RealThing
  14.     {
  15.         public int GetThingNumber()
  16.         {
  17.             return 13;
  18.         }
  19.     }
  20.  
  21.     public class ClassToBeTested
  22.     {
  23.         protected virtual IThingInterface GetThing()
  24.         {
  25.             return new RealThing() as IThingInterface;
  26.         }
  27.         public int WhatIsTheThingNumber()
  28.         {
  29.             IThingInterface iThing = GetThing();
  30.             return iThing.GetThingNumber(); 
  31.         }
  32.     }
  33.  
  34.     /// <summary>
  35.     /// This class inherits from ClassToBeTested, so it can override the Virtual Thing Factory method (GetThing).  
  36.     /// </summary>
  37.     [TestFixture]
  38.     public class TestClass : ClassToBeTested
  39.     {
  40.         private Mockery mocks = new Mockery();
  41.  
  42.         /// <summary>
  43.         /// This is the key.  
  44.         /// </summary>
  45.         protected override IThingInterface GetThing()
  46.         {
  47.             IThingInterface mockThing = mocks.NewMock<IThingInterface>();
  48.             Expect.AtLeastOnce.On(mockThing).Method("GetThingNumber").Will(Return.Value(42));
  49.             return mockThing;
  50.         }
  51.  
  52.         [Test]
  53.         public void TestGetThingNumber()
  54.         {
  55.             Assert.AreEqual(42, this.WhatIsTheThingNumber(), "Get Thing Number value should return 42 as specified by the mock.");
  56.         }
  57.     }
  58. }

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