How to create a sustainable codebase?

Within projects you often don’t have the time to write tests – or at least that’s what you think. Refactoring turns out to be hard as you can’t validate your code, and your new code turns out to be quite buggy. Fixing those bugs costs even more time. Creating a sustainable codebase with tests prevents this and doesn’t need to eat up lots of time. I’ll be sharing learnings from more than eight years of iOS development experience and banging the drum for sustainability.