But I can write my tests later", you say. No, you can't…
““But I can write my tests later", you say. No, you can't. Not really. Oh, you can write some tests later. You can even approach high coverage later if you are careful to measure it. But the tests you write after the fact are defense. Tests you write first are offense. After-the-fact tests are written by someone who is already vested in the code and already knows how the problem was solved. There's just no way those tests can be anywhere near as incisive as tests written first.””
About This Quote
This interpretation was drafted with AI assistance. It is one reading of the quote, not the author's own explanation.
Writing tests before code creates proactive, precise checks; post‑hoc tests are reactive and less effective.
In simple terms: First‑write tests are stronger than later ones.
Key Takeaway
Write tests first.
Themes
software engineering
testing
quality assurance
Mood
cautious
analytical
Type
advice
technical
When to use this quote
- code reviews
- continuous integration
- pair programming
- refactoring
Key Concepts
test‑driven development
defensive programming
Questions to Reflect On
- How can you ensure test coverage early?
- What risks arise from retroactive testing?
A Different Perspective
Later tests may miss hidden assumptions.