Hello Robin,
You can deploy an EAR file in the test environment by using the admin console. To start the admin console, start the server and right click on "Run administrative console". (If this option is disabled then first go to your server configuration, go the the configuration tabpage and select "Enable administration console". You must restart the server after this action.)
When you clicked "Run administrative console", the administration console appears, optionally fill in a userid and hit OK.
Now you are in your the admin console and via "Applications - Install new Application"
you should be able to deploy your application by just using an EAR file......
If it doesnot work make sure you install all available fixpacks/updates for both WSAD and the WSAS.
Hopes this works for you.
Lars