We're in the process of debugging the test app. There will periodically be test WUs released in small batches to test the new app version. The new WUs should require lower accuracy and should complete more quickly than the last batch.
Credit will be given out for successfully completed WUs (that is, WUs without errors). However, we'd like to remind everybody that credit is not guaranteed for test WUs. Test WUs help us to release new versions of CAMB and keep C@H going; be aware, however, that these WUs can (and often do) fail, so if you would rather crunch regular WUs and not have to deal with the hassle of failed WUs, then disable test work in your project preferences. Crunching test WUs will never be compulsory. That being said, however, we will make every effort to reward users who donate their CPU time to help us test.