Buglyst Blog
Learn to debug under pressure.
Playbooks for fast pattern recognition, guides for the full investigation, and articles for the engineering judgment around the edges.
17 playbooks · 509 guides · 95 articles · 12 linked practice labs ·skip to practice
Fast pattern recognition for the production failures engineers see most often.
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Structured investigations for the failure modes engineers meet in real systems.
Debugging Cypress Tests Inside an iFrame: The Cross-Origin Trap
A practical debugging guide for when Cypress tests fail inside iframes—covering cross-origin restrictions, timing issues, and element access.
Cypress intercept stub not intercepting requests — debugging guide
A debugging guide for when cy.intercept() stubs silently fail to match or intercept requests, covering URL patterns, method mismatches, timing, and aliasing traps.
React Testing Library fireEvent Not Triggering: Silent Failures and Real Fixes
When React Testing Library's fireEvent doesn't trigger, it's usually due to stale closures, wrong event type, or async state updates. This guide covers real causes and fixes.
MSW Request Not Intercepted: Why Your Handler Isn't Catching the Call
A practical guide to debugging why MSW (Mock Service Worker) handlers fail to intercept requests, covering worker registration, URL mismatches, and lifecycle issues.
Jest Fake Timers Not Working: A Debugging Guide
A practical guide to debugging when Jest's fake timers (jest.useFakeTimers) don't behave as expected—covering async race conditions, timer scope, and common pitfalls.
Debugging Testcontainers Container Startup Timeout
A focused guide for diagnosing and fixing Testcontainers startup timeouts, covering Docker resource constraints and Ryuk issues.
Long-form thinking on debugging habits, observability, and the systems around the bug.
Mocking External APIs in Tests: Why stubbing HTTP is harder than it looks
Stubbing HTTP calls seems easy until a subtle mismatch between your mock and the real API causes a production incident. Here's what I learned the hard way.
How I Diagnosed a 1-in-1000 Race Condition in Our CI Pipeline
A race condition that only appeared once every thousand CI runs took weeks to track down. Here's how we finally caught it, what tools helped, and what we changed to prevent similar bugs.
Debugging Flaky Tests for Good: A Systematic Approach to Root Cause Analysis
Flaky tests waste time and erode trust. Here's how to find and fix the actual root cause instead of just rerunning.