TDD is a Luxury: Pragmatic Testing for the Solo Developer

The Dogma vs. The Deadline If you spend any time in the Rails community, you’ve heard the gospel: Test-Driven Development (TDD) is the only way to write professional software. You are told to write a failing test, write the code, and then refactor. In a large company with 50 engineers and a massive budget, TDD is a fantastic insurance policy. It prevents regressions in a complex machine with many moving parts. But for the One-Person Team , TDD is often a luxury you cannot afford. When you are a solo dev, your biggest threat isn't a bug in a private method - it’s Time to Market. If you spend 50% of your week maintaining a suite of unit tests that merely "mirror" your code, you are going to get outpaced by someone who is actually shipping features. Here is how to test like a pragmatist. The Problem with Unit Tests (The "Mirror" Trap) Unit tests focus on the smallest possible parts of your app: a single method in a model, or a specific calculation in a service object. The problem? In a ra