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Shipping code fast is key to delivering a successful software product. First-mover advantage is critical in many domains, and with the easy availability of cloud infrastructure, open source components, and CI/CD practices and tools, it's never been more possible to go fast.
However, increasing speed at the cost of everything else ("move fast and break things") is untenable beyond a certain point. When shortcuts are taken, tech debt accumulates, slowing development over time. Furthermore, the occasional bug or incident must be tolerable -- a non-starter in domains where availability is paramount, e.g. cloud infrastructure, or application security products.
This seems at first glance like a fundamental tradeoff, but doesn't have to be: if processes and tools evolve to support rapid development, we can maintain quality while shipping on time. The key is being extremely deliberate with our testing efforts and continuously optimizing them for efficiency.
In this book, we introduce four Test Lean principles that can enable you to deliver high quality software:
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