Clearing a false positive: my error guard matched too much

Project Overview

I built TestFlow Agent — an open-source tool that turns plain-English test cases (or a live browser recording) into runnable Postman, Playwright, and JMeter tests.

Its live-discovery feature launches a headed Chromium via Playwright to record real traffic. That only works where there's a display, so when someone runs the backend inside Docker (no X server), the launch fails. To make that failure friendly, I added a guard that catches the error and returns a clear 503 — "live discovery needs a headed browser; run the backend natively."

Good idea. Buggy execution.

Bug Fix or Performance Improvement

Clearing a false positive: my error guard matched too much

Related reading

BrowserAct vs Playwright: Where Test Automation Hits Real-World Anti-Bot…

When pytest Said "Passed," It Was Lying

I built an AI agent that runs manual test cases in a real browser

What I'm building, and why

I Dockerized my app and one button broke — thanks, localhost

Building a Transpiler to Migrate over 4,000 Tests to Playwright