The idea is to implement a Docker container, where it will be easy to reproduce flaky/unstable test, which usually can be reproducible only under high CPU load and in case running 10-20 tests in parallel.
To build the image and run the container
# 1. clone "js-clients" into this folder
# 2. run and wait
bash build.shOnce the process will be finished, container's terminal will be opened. Examples, what I do further:
cd ./some/folder/with/some/flaky/test
# just usefull aliases (will be great to add them to container automatically):
alias test="jest --silent someFlakyTest.spec.tsx"
alias test5="test & test & test & test & test &"
# and finally
test5Running only 4-5 tests in parallel (e.g. test5 command) should reveal unstable tests.
Comparing to it, I had to run 4x yes > /dev/null and 15-20 parallel jest --silent someFlakyTest.spec.tsx' on my Mac to reveal the same problem.