The third hand knowledge I have of booking.com was that lack of unit tests was an explicit choice. I.e. they felt it was more efficient to just catch bugs in pr

The third hand knowledge I have of booking.com was that lack of unit tests was an explicit choice. I.e. they felt it was more efficient to just catch bugs in production and be quick to fix them than spend time in unit tests that got obsolete fast and add friction. I didn't buy in the narrative, but it was an interesting perspective.