Ah, interesting. So reload() works more like clear or reset. Based just on method name (this illustrates why I think method names are so important) I had assumed it just reloaded the services immediately.

As far as testing, should be easy-ish:

1. build the ServiceRegistry containing the service in question
2. get reference to the service in question
3. stop the built ServiceRegistry
4. verify that the service "did its work"