denormalizer testing

denormalizer-testing.cs

public abstract class DenormalizerTest<TDenormalizer, TView>
{
   public abstract IEnumerable<Event> GivenTheseEvents();
   public abstract IQueryable<TView> WhenIPerformThisQuery();
   public abstract IEnumerable<TView> IShouldGetTheseResults();

   [Test]
   public void PerformTest()
   {
       var events = GivenTheseEvents();
       dynamic denormalizer = Activator.CreateInstance<TDenormalizer>(); //many ways of doing this
       foreach(dynamic @event in events) { denormalizer.Handle(@event); }

       var actual = WhenIPerformThisQuery().ToList();
       var expected = IShouldGetTheseResults().ToList();

       CompareObjects co = new CompareObject();
       //use other virtual methods to set up ignore patterns etc.
       Assert.IsTrue(co.Compare(expected, Actual), co.DifferencesString);
   }
}

//An implementation might look like:

[TestFixture]
public class SomeDenormalizerTest : DenormalizerTest<SomeDenormalizer, ViewManagedByDenormalizer>
{
    SomeReadContext _context = new SomeReadContext();
    public override IEnumerable<Event> GivenTheseEvents(){ yield return new Event1(...); yield return new Event2(...); ...}
    public override IQueryable<TView>() { return _context.ViewManagedByDenormalizers.Where(x=>x.Age>16); }
    public override IEnumerable<TView>() { yield return new ViewManagedByDenormalizer(...); yield return ViewManagedBYDenormalizers(...); ... }
}