This tool was intended to help QA guy like me with flaky tests, buy either measuring the "flakyness" of the test, or run it until it fails to debug it.
Let's say your test command is run test
You want to run a test until it fails to debug it, and you know it may take a while:
$ looper --max-tries 0 --stop-on-first-fail "run test"
max-tries to 0, means that there is no limit to the number of times a test can sucessfully run
You want to find the failing rate of a test of out 1000 runs:
$ looper --max-tries 1000 "run test"
At the end you will have a sumary
pip install --user py-loop