Comment by chriswarbo

When I'm "up to my armpits in trying to understand the on-the-ground problem", I find PBT great for quickly find mistakes in the assumptions/intuitions I'm making about surrounding code and helper functions.

Whenever I find myself thinking "WTF? Surely ABC does XYZ?", and the code for ABC isn't immediately obvious, then I'll bang-out an `ABC_does_XYZ` property and see if I'm wrong. This can be much faster than trying to think up "good" examples to check, especially when I'm not familiar with the domain model, and the relevant values would be giant nested things. I'll let the computer have a go first.