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AI Agent vs a Vibe-Coded App: 5 of 5 Bugs, Plus One Nobody Planted

· 12 min read
Marcel Veselka
CEO, Wopee.io

Can an AI testing agent find bugs in a vibe-coded app it has never seen? On 22 October 2026 we tried it live on YouTube. We planted 5 bugs in a food-delivery demo app, added a new feature with one prompt, and pointed the Wopee.io agent at it with a 4-line ticket and the app's business rules. Not the bugs.

It found all 5. Three with the exact steps from our answer key, two by their symptoms. Zero false alarms.

And it found one more that nobody planted.

Here is the scoreboard, how it got there, and what didn't go well.

Vibe Coding, Vibe Testing, and Vibe Engineering

· 18 min read
Marcel Veselka
CEO, Wopee.io

When we talk about the vibe in software development, we’re talking about that almost-magical state where everything just flows: ideas turn into code effortlessly, tools feel like natural extensions of our creativity, teamwork clicks without friction, and we actually enjoy the process. This vibe-centric approach is giving rise to concepts like Vibe Coding, Vibe Testing, and Vibe Engineering. These aren’t just buzzwords; they represent a shift in how we build software, focusing on human creativity and happiness supported by powerful automation and AI. Before you dismiss it as hype, let’s explore what each of these concepts means and how together they can transform software development.