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The tests had a race condition if autovacuum was set to off. Instead we create all the tables we are interested in with autovacuum disabled, so they are only ever touched when in danger of wraparound. Discussion: https://postgr.es/m/3e2cbd24-f45e-4b2b-ba83-8149214f0a4d@dunslane.net Masahiko Sawada (slightly tweaked by me) Backpatch to release 17 where these tests were introduced.
Test extensions and libraries ============================= src/test/modules contains PostgreSQL extensions that are primarily or entirely intended for testing PostgreSQL and/or to serve as example code. The extensions here aren't intended to be installed in a production server and aren't suitable for "real work". Furthermore, while you can do "make install" and "make installcheck" in this directory or its children, it is NOT ADVISABLE to do so with a server containing valuable data. Some of these tests may have undesirable side-effects on roles or other global objects within the tested server. "make installcheck-world" at the top level does not recurse into this directory. Most extensions have their own pg_regress tests or isolationtester specs. Some are also used by tests elsewhere in the tree. If you're adding new hooks or other functionality exposed as C-level API this is where to add the tests for it.