> You already have a degree from some university, and you already worked in software development for quite some time. So it's very annoying to do some test over and over again for every job application.

Ok, but there's no uniform grading in school or employment. We all know people who managed to get through university without learning anything and manage to hold a job in software development without knowing or doing anything. It'd be nice if a degree and a job history guaranteed competence, but it doesn't.

Lots of professions can bring a portfolio and/or a sample of their work, but most software developers can't because the work is often propriatary and a trade secret, and anyway would need a lot of specific setup to operate.

I've only taken test tests for government jobs, and they were laughably outdated; approximately nobody knew how much space was on a 5 1/4" floppy in 1998 when I took the test, but they were asking about 8" floppies, and I assume they still are, because the test had to go through some process and doing a new test would be expensive. But yeah, I expect a company to validate that I can both describe solutions to problems and turn that description into code.