I disagree. We spend a considerable amount of time writing our behavioural tests (we have around 1,700 for our large web app), but they have saved us countless

I disagree. We spend a considerable amount of time writing our behavioural tests (we have around 1,700 for our large web app), but they have saved us countless times from having to track down bugs after deploying code. There was an article published in the last few weeks which showed that teams who write tests spend 10-15% longer in the development process, but they also save 25-30% of the development process time by not having to fix regression defects. Unfortunately, I don't remember which site it was linked from or what the article's title was. If I can find it, I'll link it here.