Test-Driven Development in Practice
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@seed-creator · muallif
The Red-Green-Refactor Loop
Write a failing test (red), write the minimum code to pass it (green), then clean up both the implementation and the test without changing behavior (refactor). The discipline is in stopping at green before refactoring.
TDD is a design tool that happens to produce tests, not a testing methodology that happens to influence design.
When TDD Pays Off
TDD shines for pure logic: parsing, validation rules, state machines, algorithms. It struggles with I/O-heavy code where the real feedback loop requires a running database or external API.
Starting a new feature with TDD forces you to design the interface before the implementation. If the test is hard to write, the API is probably wrong.
Tests Not Worth Writing
Do not test trivial getters, framework boilerplate, or third-party library behavior. Tests have a maintenance cost. Only pay that cost when the test would catch a regression worth preventing.
Property-Based Testing
Property-based testing generates hundreds of random inputs and checks that a property holds for all of them. For parsers, serializers, and state machines, it finds edge cases no human would think to test.
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