Now you’ve written a test.
But does it fail?
If it doesn’t, you have no proof that your implementation makes a difference.
A test that always passes is worse than no test.
It gives you a false sense of security.
It hides bugs instead of exposing them.
That’s why the RED step matters.
You watch it fail.
That failure is evidence.
Later, when it turns GREEN, you know the code caused it — not luck, not a misconfigured test, not a false positive.
⚡Can the Test Actually Fail?
If you’ve seen it fail:
It confirms the test is valid.
It means that the later GREEN step actually proves your code works.
It protects you from false positives — those sneaky tests that always pass, giving you a fake sense of correctness.
TDD makes it unavoidable.
No RED? No trust in your code.
Why Developers Skip It (And Regret It)
It’s tempting to skip RED:
“I know this code will work, so why watch it fail?”
“It’s faster to just implement and see GREEN.”
But skipping RED is like installing a fire alarm that never goes off — you won’t know something’s broken until it’s too late.
Watching the test fail is the cheapest, fastest bug prevention you can get.
RED Before GREEN
TDD isn’t just about writing tests.
It’s about proof.
Proof that your test matters.
Proof that your code works.
Proof that the system behaves as expected.
You can take a step further with Acceptance Test–Driven Development (ATDD).
Instead of just asking:
“Does my code work?”
ATDD asks:
“Does the system behave as the user expects?”
It’s less about writing more tests and more about making sure everyone — Devs, QA, and Product Owners — agrees on what “done” really means.
The cool part? Fewer arguments about whether something is broken, fewer regression bugs, and a lot less late-night firefighting — because expectations are clear before you write a single line of code.
🚀 Join me for: ATDD – Acceptance Testing Workshop
Limited spots. Get 100 EUR off with code EARLYBIRD100