feat(forge): add --rerun-failed flag to watch mode for faster TDD feedback #11993
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silvekkk
requested review from
0xrusowsky,
DaniPopes,
grandizzy,
mattsse,
onbjerg,
yash-atreya and
zerosnacks
as code owners
grandizzy
approved these changes
Oct 10, 2025
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When developing with
forge test --watch, running all tests on every file change can be slow . Adds a--rerun-failedflag that automatically reruns only previously failed tests when files change, falling back to normal watch behavior once failures are resolved.The flag use the existing test failure tracking mechanism (cache/test-failures file) when tests fail. When enabled, watch mode checks if this file exists and automatically adds
--rerunto the command, otherwise it proceeds with the standard file-based test filtering.For example, in a project with 80 tests where 3 are failing, this reduces iteration time from ~2 minutes to ~6 seconds per change, making watch mode practical for TDD workflows where you're iterating on fixing specific test failures.
Usage:
forge test --watch --rerun-failed