I'm at a FANG with some of the smartest people I have ever encountered in my life, yet no one seems to agree with me that devs should not write their own tests.
There is an unwavering belief that knowing the corner cases and weak points of your own code makes you somehow better at writing the tests. We also seem to be obsessed with testing that is half-way between unit level testing and system level testing. We test APIs and features more or less in isolation.
Tests should be written by antagonistic developers who are not at all familiar with the code. They should stress the capabilities promised in the interface documentation. Hiring more people who are dedicated to testing costs a lot of money though. I don't see things changing anytime soon.
There is an unwavering belief that knowing the corner cases and weak points of your own code makes you somehow better at writing the tests. We also seem to be obsessed with testing that is half-way between unit level testing and system level testing. We test APIs and features more or less in isolation.
Tests should be written by antagonistic developers who are not at all familiar with the code. They should stress the capabilities promised in the interface documentation. Hiring more people who are dedicated to testing costs a lot of money though. I don't see things changing anytime soon.