TL;DR: Use per-test coverage data to build a reverse map (file → tests that touch it). Git diff + map...
TL;DR: Use per-test coverage data to build a reverse map (file → tests that touch it). Git diff + map lookup = run only relevant tests. 43min → 4min CI time.
The Problem Everyone Has
Your test suite runs for 45 minutes. You change one file. Should you:
Run all 2,000 tests? (Safe but slow)
Run tests with matching filenames? (Fast but broken)
Every team I've worked on has had the same conversation at some point. Someone opens the coverage...
Your CI re-runs the entire test suite on every push. But a one-line change can only break a handful...
Abstract An automated test suite is the ultimate gatekeeper for your code, but if it takes 20 minutes...
Test Impact Analysis is a simple promise: don't re-run the tests your change couldn't possibly have...
Brushing Over Real Problems TL;DR: You write tests that touch every line but verify nothing,...
Flaky tests quietly drain engineering teams. You hit re-run, the test passes, and move on — but that...
