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I noticed that our code coverage report showed considerable deficiency in test coverage for PL/pgSQL control statements. Notably, both exec_stmt_block and most of the loop control statements had very poor coverage of handling of return/exit/continue result codes from their child statements; and exec_stmt_fori was seriously lacking in feature coverage, having no test that exercised its BY or REVERSE features, nor verification that its overflow defenses work. Now that we have some infrastructure for plpgsql-specific test scripts, the natural thing to do is make a new script rather than further extend plpgsql.sql. So I created a new script plpgsql_control.sql with the charter to test plpgsql control structures, and moved a few existing tests there because they fell entirely under that charter. I then added new test cases that exercise the bits of code complained of above. Of the five kinds of loop statements, only exec_stmt_while's result code handling is fully exercised by these tests. That would be a deficiency as things stand, but a follow-on commit will merge the loop statements' result code handling into one implementation. So testing each usage of that implementation separately seems redundant. In passing, also add a couple test cases to plpgsql.sql to more fully exercise plpgsql's code related to expanded arrays --- I had thought that area was sufficiently covered already, but the coverage report showed a couple of un-executed code paths. Discussion: https://postgr.es/m/26314.1514670401@sss.pgh.pa.us
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