When to Write Tests in the Development Process?

When to write tests in the development process? I can imagine saying, hey, write them as early as possible. But especially with a game, you might be iterating and changing the game a lot. Could you end up writing tests prematurely? What have you recommended or what do you see people doing? Yeah. And I think this, you know, very closely relates with application. Once the framework is in place and once everyone sees the weather is hooked up to CI or whatever is reporting the test results, it can grow from there.