How I Used an AI Agent to "Enforce" 70% Unit Test Coverage for 3,000 Users

Hello everyone, I'm back! Following my previous post on Zero-Downtime , my CLI tool nodejs-quickstart-structure has fortunately reached nearly 3,000 downloads . This milestone is both a joy and a pressure. The pressure lies in: How do I ensure that every project initialized from the tool is truly "Production-Ready"? The answer doesn't lie in boilerplate code, but in Unit Testing . However, instead of just manually writing tests, I tried a more "trendy" approach: Building an AI Testing Agent to establish a Quality Gate for the entire project. 1. The Pain: "I'll Write Tests Later!" ... and the Reality We all know Unit Testing is important. But in reality, when starting a new Node.js project: Setting up Jest and ts-jest takes time. Mocking Mongoose, Redis, and Express Request/Response is incredibly cumbersome. Defining a tests/ folder structure that follows Clean Architecture is a hassle. The result? We often tell ourselves: "Let's finish the logic first, then write tests later." And that