asyncworkertestability.html

---
layout: documentation 
title: EvaluationEngine 
teaser: Decouple business logic from control flow
navigation:
   - name: Overview
     link: asyncworker.html 
   - name: Execute asynchronous operation
     link: asyncworkerasyncoperation.html
   - name: Execute code on completion
     link: asyncworkercompletion.html
   - name: Exception Handling
     link: asyncworkerexceptionhandling.html
   - name: Cancel asynchronous operation
     link: asyncworkercancel.html
   - name: Use progress
     link: asyncworkerprogress.html
   - name: Testability
     link: asyncworkertestability.html
---
<h2>Testability</h2>
<p>
To simplify testing, you should never instantiate an async worker directly, but inject an <code>IAsyncWorker</code>.
In production code you can inject a real <code>AsyncWorker</code>. In test code you can inject a fake object that executes the delegates synchronously.
Thus simplifying testing because no multi.threading handling is necessary.
</p>