You join a team/company that values tests and code quality. Should be a part of you interviewing the company. Trying to single handedly change the culture of a

You join a team/company that values tests and code quality. Should be a part of you interviewing the company. Trying to single handedly change the culture of a large company where you'll have few allies (because by this point, they'll have all self selected away) is a fools errand.