Test extensions and libraries
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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".
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.