Yep. Also Pinterest really isn't that complex an application. Clicking on buttons and trying scenarios out is probably good enough (given the time they have ava

Yep. Also Pinterest really isn't that complex an application. Clicking on buttons and trying scenarios out is probably good enough (given the time they have available). The major hiccups like server slowdowns, or concurrency issues, or too much memory being used for a request are hard to unit test anyway, and those are the real potential issues they face.