Testing in Serverless: TDD and Serverless at Scale

If you're building with serverless, you've probably already found yourself asking, "How am I supposed to properly test this thing?" You're not alone. Testing in serverless architectures is consistently one of the biggest pain points developers report, and for good reason. The event-driven nature of it all means your code doesn't run in a single, predictable place. Finding the right test infrastructure for that isn't just complex — it can feel like chasing a moving target. But here's the thing: the problem usually isn't serverless itself. It's that most teams approach testing in serverless the same way they approached it in monoliths or traditional microservices — and then wonder why it doesn't quite fit. Test-Driven Development changes that equation. Not because it's a silver bullet, but because it forces you to think about how your code behaves before you think about where it runs. And in serverless, that mindset shift makes all the difference. In this article, we'll walk through why