Your Code Just Failed a Test. Good.
What if your IDE could use that moment to make you a better developer?
“Best practices are great…
But I can never apply them to my actual work.”
That’s one of the most common pieces of feedback I’ve heard from developers going through Craft Academy over the years.
And they’re right.
Clean Architecture, TDD, dependency injection, all of that sounds amazing in tutorials.
But when you're knee-deep in a real project with legacy code, business pressure, and unclear requirements… theory just doesn’t cut it.
Why?
Because pain is personal.
You only feel the need for a good practice when you hit the wall, in your own context.
That’s why I believe the future of learning isn’t just personalized.
It’s contextual.
Let me show you what I mean.
Imagine this:
You open your IDE on a Tuesday morning. Cursor or VSCode, doesn’t matter.
Your AI assistant greets you:
🤖: "Hey! Last time we talked, you were adding that new use case: '50% chance to send a surprise promo after a purchase', right?"
🧑💻: "Yeah, marketing insisted on that one."
🤖: "Cool. Let’s start by writing a test that intentionally fails. Just to frame the behavior."
So you write a quick unit test. It checks that shouldSendPromo(client) returns either true or false, you're not expecting magic.
Then you implement the obvious solution:
return Math.random() < 0.5;
You run the test. It passes.
You run it again. It fails.
Wait. What?
Welcome to the world of non-deterministic tests.
You pause. You read the code again. Then it clicks:
"Of course. It’s random. The test result depends on the mood of Math.random()."
This is a common beginner trap. Even experienced developers fall into it when rushing.
Because it works, until it doesn’t.
And this is where the magic happens:
🤖: "Exactly. You just discovered a non-deterministic test caused by an implicit dependency on randomness."
🤖: "Want me to show you how to make it testable?"
You say yes.
And instantly, the AI assistant refactors your code using a tiny RandomGenerator interface. Something like:
interface RandomGenerator {
next(): number;
}
function shouldSendPromo(rng: RandomGenerator): boolean {
return rng.next() < 0.5;
}
Now in production, you inject the real Random generator.
In tests, you inject a fake that always returns 0.3 or 0. 7, boom, full control.
And just as you start thinking "okay, this makes sense", the assistant opens a 3-minute video.
It’s a short lesson on Dependency Inversion, within your codebase, ultra personalized!
No generic diagrams.
No laundry list of SOLID principles.
Just your code. Your problem. Your fix.
This is the future of learning.
Not a static playlist of videos or a bootcamp that treats everyone the same. Not a guru telling you what to do without context.
But an AI that watches your code evolve and jumps in when it hurts, with exactly what you need, exactly when you need it, or when you need to learn something new.
Your tests fail? Good. That’s a learning moment.
You copy-paste logic across two places? Cool, the AI sees that too.
You hard-code a date, a string, or a DB call? Nice, time to learn about boundaries, adapters, or test doubles.
This is what I'm building at Craft Academy, I’ve trained 1,470+ devs on TDD, Clean Architecture, and Domain-Driven Design.
But I want to go further.
I’m building an AI-powered companion that sits inside your IDE. Not to give you answers but to guide your craft.
Not by explaining the theory, but by surfacing it through your real problems.
It’s like having a mentor right at your fingertips. A pairing partner acting as a tech lead laser-focused on exactly the issue you're facing.
Want early access? Stay tuned !
If you're curious, or excited, or skeptical but intrigued, I’m opening early access soon, you can also respond to this post if you have any questions :)
No fluff. No over-engineered UX. Just raw feedback loops and craftsmanship guidance at your fingertips.
Let’s teach devs in context and turn production code into a learning experience, let’s make every mistake a trigger for growth.
Because when a test fails, that’s not a problem.
That’s a teacher knocking :)
Happy Coding :)
Pierre.
PS : Si tu es français.e, j'ouvre ce genre d'accompagnement personnalisé mais sans IA pour le moment, avec juste moi en chair et en os derrière ! Si ça t'intéresse, voici le formulaire : https://forms.gle/UVHqDTQHtvF9NGfU9