src/working/working.test.js is the minimal example without Sentry library.
Test is duplicated 500 times and ran with flags --maxWorkers=1 --logHeapUsage --detectOpenHandles --detectLeaks
to log heap usage and detect leaks.
log_working.txt shows that it does not leak - memory usage stays consistent.
By require'ing @sentry/node package (just doing require,
nothing else) - it leaks memory.
src/leaking/leaking.test.js illustrates that.
Duplicated 500 times.
When ran with flags --maxWorkers=1 --logHeapUsage --detectOpenHandles it shows increasing memory usage. Some garbage
collection happens on they way, but not all memory is freed.
log_leaking.txt shows that. With 500 tests it ends with ~1800Mb memory, or ~30Mb not freed memory per 1 test.
When ran with additional flag --detectLeaks - Jest reports leakage (confirming the log).