WIP: unit test for set_timer

- test the drains
- test failure to drain timer

Fix BSDs
- bidirectional pipes on FreeBSD
- race condition with timer_expired(); easier to see on NetBSD

Author: jchampio

src/interfaces/libpq-oauth/Makefile

@@ -79,5 +79,19 @@ uninstall:
 	rm -f '$(DESTDIR)$(libdir)/$(stlib)'
 	rm -f '$(DESTDIR)$(libdir)/$(shlib)'
 
+.PHONY: all-tests
+all-tests: oauth_tests$(X)
+
+oauth_tests$(X): test-oauth-curl.o oauth-utils.o $(WIN32RES) | submake-libpgport submake-libpq
+	$(CC) $(CFLAGS) $^ $(LDFLAGS) $(LDFLAGS_EX) $(SHLIB_LINK) -o $@
+
+check: all-tests
+	$(prove_check)
+
+installcheck: all-tests
+	$(prove_installcheck)
+
 clean distclean: clean-lib
 	rm -f $(OBJS) $(OBJS_STATIC) $(OBJS_SHLIB)
+	rm -f test-oauth-curl.o oauth_tests$(X)
+	rm -rf tmp_check

src/interfaces/libpq-oauth/meson.build

@@ -47,3 +47,38 @@ libpq_oauth_so = shared_module(libpq_oauth_name,
   link_args: export_fmt.format(export_file.full_path()),
   kwargs: default_lib_args,
 )
+
+libpq_oauth_test_deps = []
+
+oauth_test_sources = files('test-oauth-curl.c') + libpq_oauth_so_sources
+
+if host_system == 'windows'
+  oauth_test_sources += rc_bin_gen.process(win32ver_rc, extra_args: [
+    '--NAME', 'oauth_tests',
+    '--FILEDESC', 'OAuth unit test program',])
+endif
+
+libpq_oauth_test_deps += executable('oauth_tests',
+  oauth_test_sources,
+  dependencies: [frontend_shlib_code, libpq, libpq_oauth_deps],
+  kwargs: default_bin_args + {
+    'c_args': default_bin_args.get('c_args', []) + libpq_oauth_so_c_args,
+    'c_pch': pch_postgres_fe_h,
+    'include_directories': [libpq_inc, postgres_inc],
+    'install': false,
+  }
+)
+
+testprep_targets += libpq_oauth_test_deps
+
+tests += {
+  'name': 'libpq-oauth',
+  'sd': meson.current_source_dir(),
+  'bd': meson.current_build_dir(),
+  'tap': {
+    'tests': [
+      't/001_oauth.pl',
+    ],
+    'deps': libpq_oauth_test_deps,
+  },
+}

src/interfaces/libpq-oauth/t/001_oauth.pl

@@ -0,0 +1,24 @@
+# Copyright (c) 2025, PostgreSQL Global Development Group
+use strict;
+use warnings FATAL => 'all';
+
+use PostgreSQL::Test::Utils;
+use Test::More;
+
+# Defer entirely to the oauth_tests executable. stdout/err is routed through
+# Test::More so that our logging infrastructure can handle it correctly. Using
+# IPC::Run::new_chunker seems to help interleave the two streams a little better
+# than without.
+#
+# TODO: prove can also deal with native executables itself, which we could
+# probably make use of via PROVE_TESTS on the Makefile side. But the Meson setup
+# calls Perl directly, which would require more code to work around... and
+# there's still the matter of logging.
+my $builder = Test::More->builder;
+my $out = $builder->output;
+my $err = $builder->failure_output;
+
+IPC::Run::run ['oauth_tests'],
+  '>', IPC::Run::new_chunker, sub { print {$out} $_[0] },
+  '2>', IPC::Run::new_chunker, sub { print {$err} $_[0] }
+  or die "oauth_tests returned $?";