On the Zend blog they've posted an article where Zend's own Cal Evans shares the answers to some of the questions he received from a "unit testing for product managers" webinar.

Thanks to everyone that joined our Unit testing for project managers webinar yesterday. It was great to see so many people engaged and asking questions. I’ve pulled together answers for your questions we didn’t get to on the webcast. If you have more questions, leave a comment below!

If you missed the webinar or want to re-watch it, the on-demand version is now available. The slides are also posted on Slideshare.

The questions he answers touch on topics that include:

• property-based testing
• testing on an existing project (medium or large)
• integration vs unit testing

The final answer covers something shared at the end of the presentation, the resolution to "just do it". Cal backs that statement up with some additional detail and puts it in the mindset of a project manager.