BackgroundHelper: avoid leaking threads #475
Merged
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Closes: #471
Many test cases would define
teardown
without calling super so we were never killing threads...It's better to use
before_teardown
anyway, and it's less popular so less likely to be overriden without a super.This is very likely to be the cause of the crash we've seen at https://github.com/Shopify/semian/actions/runs/4122969863/jobs/7120418231
Co-Authored-By: @adrianna-chang-shopify