Add test triggering the race condition in content_add
This minimal example triggers #2019 (closed)
Test Plan
tox -e py3 -- -k TestStorageRaceConditions
Migrated from D2041 (view on Phabricator)
This minimal example triggers #2019 (closed)
tox -e py3 -- -k TestStorageRaceConditions
Migrated from D2041 (view on Phabricator)