Here's another great idea from Google:

1. Create a slew of broken results through a cocked-up algo update,

2.. Run a whole series of UI tests on said broken results.

Barry lists three and I just found another minor UI change being tested:

That makes at least 4 spotted in the wild already.

A multitude of UI tests being carried out while a broken algo is still running?

Puh-lease. Someone donate a brain cell to help Google out. The world's brightest boffins have no common sense.