Thanks to some new options in rr and wptrunner, we now have a very easy way to start debugging intermittent test failures! First, build the latest version of rr from the master branch, and make sure that the `rr` binary is somewhere in your $PATH:
https://github.com/mozilla/rr/ Then, run any test-wpt or test-css test with the `--chaos` flag: ./mach test-wpt --chaos path/to/intermittent/test.html This will run the test repeatedly until it fails. It uses rr's new chaos mode to randomize execution, to make failures more likely. And it records each test run, so after it fails you can run `rr replay` to debug the failure deterministically, with extra features like reverse execution. _______________________________________________ dev-servo mailing list dev-servo@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-servo
