WebStorm and QUnit

We're using QUnit to test our JavaScript code. No matter what we try, WebStorm complains that the QUnit functions (test, module, ...) are undefined.
The library itself (qunit.js) is included in the project. This issue is new in WebStorm 2.0 (WebStorm 1.0 worked fine).
Any hint/suggestion about how to avoid the warning?
Thanks