Unfortunately you can not lease licences from a Test server. In order to lease a licence to your Desktop edition you will need to lease that from your Production server. This will then allow you to open .qvw files from your test server.
If you are in an environment where Prod and Test are on different networks then it can be a real problem - and in this case you may need to buy a separate Desktop licence in order to have a licenced QlikView Desktop in your Test environment.
Hope that explains your issue.
Remember that you can lease a licence for one user onto (I think) two different machines. So, say you are using your AD account you can lease a licence onto your laptop, and then another one onto the development server - as long as you are logged in as that user.
Often you need to have a Desktop edition licenced on the server, as sometimes things that work on a developers machine don't on the server and you need to investigate.
Glad you read the blog, I do try and put a couple of interesting articles on there a month - there is now an option to subscribe to it via email as well if you want to.