Writing a test is often the best way to reproduce and make sure you fixed a bug. Keeping them for a while lets you make sure it doesn't pop up again. 10 years

Writing a test is often the best way to reproduce and make sure you fixed a bug. Keeping them for a while lets you make sure it doesn't pop up again. 10 years later, they probably don't add much value. Tests are tools, that's like saying 'No, your food won't taste better with more salt.', it depends.