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I didn't mean to start religious discussion, rather used this term as in writings of Mark Weber (value of hard work etc.). This is more about set of principles that shaped Western and American societies, not really being related to religion anymore.

Imagine if all improvements over the course of history would be kept in secret for gains of owners of capital. Who own rights to the invention of an axe? Probably the first one who put a stone on a piece of wood. Should he has all rights for it forever? I couldn't really agree.

I see a lot of protestant mentality here in comments valuing any kind of even inhumane labour which does not allow to meet basic needs over not having a job, but also not suffering from hunger thanks to the social support system.

In my opinion, we as a society should aim to work less and less, collectively making use of automation and technological progress. But it will be hard when we label this as being lazy and not valuable member of society.

But we don't write tests to check if our code works. We write tests to be able to change it in the future with certain degree of confidence that we don't break anything and - if so - what exactly.

There are other techniques which can give similar confidence, but tests are the easiest one.