Question

I am developing Moq tests for various entities. I can setup create and delete tests fine, but not update – the entity in the repository does not change. I know this is due to the PersistAll doing nothing (probably due to a setup I am missing).

This is a sample of an insert persist setup (I am looking for an Update version):

agg.Setup(a => a.InsertOnPersist<Thingy>(model)).Callback(() => mockThingies.Add(model));

In addition, I also have this to link the List to being the repository:

agg.Setup(a => a.GetObjectStore<Artist>()).Returns(mockThingies.AsQueryable());

This is a sample of an update test I have:

 public List<Thingy> mockThingies; //this is our repository
 [TestInitialize]
 public void SetupTests()
 {
    mockThingies= new List<Thingy>();
    Thingy someThingy = new Thingy();
    someThingy.Name = "MyName";
    someThingy.ID = 1;
    mockThingies.Add(someThingy);
  }

    [TestMethod]
    public void CanEditExistingThingy()
    {
        Mock<BusinessExceptionBroadcaster> beb = new Mock<BusinessExceptionBroadcaster>();
        Mock<IValidationEngine> valid = new Mock<IValidationEngine>();
        Mock<IAggregate> agg = new Mock<IAggregate>();
        agg.Setup(a => a.GetObjectStore<Thingy>()).Returns(mockThingies.AsQueryable());
        ThingyRepository repo = new ThingyRepository (agg.Object);
        ThingyService service = new ThingyService (repo, beb.Object, valid.Object);
        Thingy newThingy = new Thingy();
        newThingy.ID = 1; //same as old
        newThingy.Name = "newname"; //new name
        Assert.AreNotEqual(newThingy.Name,mockThingies[0].Name); 
        Assert.IsTrue(service.Update(newThingy));
        Assert.AreEqual(newThingy.Name, mockThingies[0].Name); //FAILS HERE
    }

This is the code to update:

    public bool Update(Thingy entity)
    {  
            Thingy existingThingy= _Thingy.FirstOrDefault(t=>t.ID == entity.ID);
            if (existingThingy != null)
            {
                _Thingy.PersistAll();
                return true;
            }
            else
            {
               //unimportant
            }
        }
        return false;
    }

Answer 1

Don’t worry about testing whether the update call actually updates something. You’ll just want to verify that your service calls the appropriate method on the repo to perform the update and persist. Testing the actual update is a little outside the scope of this one test.