Simple.Data stored function mocking

test.cs

// test setup
var adapter = new InMemoryAdapter();

var stubId = 15;
adapter.AddFunction<int>("GenerateId", () => stubId); // A breakpoint here inside the lambda *does* break when we call it later

Database.UseMockAdapter(adapter);
dynamic db = Database.Open();

var resultId = db.GenerateId().ReturnValue;

Assert.AreEqual(stubId, resultId); // Throws here, stating that resultId is 0.