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When libpq is loaded in the server (for instance, by libpqwalreceiver), it may use libpq environment variables set in the postmaster environment for connection parameter defaults. This has some confusing effects in our test suites. For example, the TAP test infrastructure sets PGAPPNAME to allow identifying clients in the server log. But this environment variable is also inherited by temporary servers started with pg_ctl and is then in turn used by libpqwalreceiver as the application_name for connecting to remote servers where it then shows up in pg_stat_replication and is relevant for things like synchronous_standby_names. Replication already has a suitable default for application_name, and overriding that accidentally then requires the individual test cases to re-override that, which is all very confusing and unnecessary. To fix, unset PGAPPNAME temporarily before running pg_ctl start or restart in the tests. More comprehensive approaches like unsetting all environment variables in pg_ctl were considered but might be too complicated to achieve portably. The now unnecessary re-overriding of application_name by test cases is also removed. Reviewed-by: Noah Misch <noah@leadboat.com> Discussion: https://www.postgresql.org/message-id/flat/33383613-690e-6f1b-d5ba-4957ff40f6ce@2ndquadrant.com
PostgreSQL tests ================ This directory contains a variety of test infrastructure as well as some of the tests in PostgreSQL. Not all tests are here -- in particular, there are more in individual contrib/ modules and in src/bin. Not all these tests get run by "make check". Check src/test/Makefile to see which tests get run automatically. authentication/ Tests for authentication examples/ Demonstration programs for libpq that double as regression tests via "make check" isolation/ Tests for concurrent behavior at the SQL level locale/ Sanity checks for locale data, encodings, etc mb/ Tests for multibyte encoding (UTF-8) support modules/ Extensions used only or mainly for test purposes, generally not suitable for installing in production databases perl/ Infrastructure for Perl-based TAP tests recovery/ Test suite for recovery and replication regress/ PostgreSQL's main regression test suite, pg_regress ssl/ Tests to exercise and verify SSL certificate handling subscription/ Tests for logical replication thread/ A thread-safety-testing utility used by configure