The flake
files.
Investigations, methodology, and field notes on flaky tests, CI cost, and what your engineering org is quietly paying for.
Why Claude Code AutoFix Can't Fix Flaky Tests
AutoFix is great at real bugs. Flaky tests break the loop — speculative fixes, infinite reruns, wrong-file blame. Here's why, and the right way to combine AutoFix with flake detection.
Read the dispatch →GitHub Actions CI Is Slow? Here's What's Actually Wasting Your Time
The top 5 time wasters in GitHub Actions pipelines — flaky reruns, missing caches, no path filters, sequential jobs, and oversized Docker images — with real workflow fixes.
Read the dispatch →How to Find and Fix Flaky Tests in Jest
Shared state, fake timers, async race conditions, port conflicts, snapshot drift — the most common Jest flakiness patterns and battle-tested fixes.
Read the dispatch →How to Find and Fix Flaky Tests in pytest
Database state leaks, freezegun, network mocking, tmp_path fixtures, import side effects — comprehensive guide to fixing flaky Python tests.
Read the dispatch →We Analyzed 10,000 GitHub Actions Runs — Here's What Flaky Tests Actually Cost
Data from 10,000 workflow runs: 30% of reruns are flaky, the average flake costs $37.50, and 80% of waste comes from just 3 tests.
Read the dispatch →Flaky Test Cost Calculator
How much are flaky tests costing your team per month? Adjust the sliders and find out — compute, developer time, and shipping delays.
Read the dispatch →Kleore vs BuildPulse vs Trunk vs Datadog
Side-by-side comparison of flaky test tools. Features, pricing, setup complexity — including where they beat us.
Read the dispatch →How Much Do Flaky Tests Actually Cost?
The real cost goes far beyond CI minutes. We break down compute, developer time, delayed merges, and trust erosion — with concrete numbers.
Read the dispatch →How to Fix Flaky Tests in GitHub Actions
Six patterns that cause 90% of test flakiness — and how to fix each one with concrete code changes.
Read the dispatch →What Are Flaky Tests? The Silent Killer of CI Pipelines
They pass. They fail. Nothing changed. Learn why flaky tests happen, how they erode trust, and what high-performing teams do differently.
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