It’s been a while since my last post in this series, but this one’s a good one.
A common task in many web applications is to display a grid of data, such as rows from a database. Think the Inbox from GMail, the model lists from the Django administration interface, or the Dashboard from Review Board. [...]

I recently spent a few days trying to track down a bug in Review Board with our unit tests. Basically, unit tests involving uploading a file to a models.ImageField would fail with a validation error specifying that the file wasn’t an image. This worked fine when actually using the application, just not during unit tests.
The [...]