Actually Tormod is right the problem is that the AutoMockingBuilderStrategy
returns a different mock instance every time when somebody requests an ISampleService
form the container.
So there is a bug in my original implementation namely the AutoMockingBuilderStrategy
doesn't store the created mocks:
Here is a fixed version:
public class AutoMockingContainerExtension : UnityContainerExtension
{
protected override void Initialize()
{
var strategy = new AutoMockingBuilderStrategy(Container);
Context.Strategies.Add(strategy, UnityBuildStage.PreCreation);
}
class AutoMockingBuilderStrategy : BuilderStrategy
{
private readonly IUnityContainer container;
private readonly Dictionary<Type, object> substitutes
= new Dictionary<Type, object>();
public AutoMockingBuilderStrategy(IUnityContainer container)
{
this.container = container;
}
public override void PreBuildUp(IBuilderContext context)
{
var key = context.OriginalBuildKey;
if (key.Type.IsInterface && !container.IsRegistered(key.Type))
{
context.Existing = GetOrCreateSubstitute(key.Type);
context.BuildComplete = true;
}
}
private object GetOrCreateSubstitute(Type type)
{
if (substitutes.ContainsKey(type))
return substitutes[type];
var substitute = Substitute.For(new[] {type}, null);
substitutes.Add(type, substitute);
return substitute;
}
}
}