Add a TAP test for test_json_parser_perf

This just makes sure the test can run with a single iteration. A real
performance test would test with many more.

src/test/modules/test_json_parser/meson.build

@@ -46,7 +46,8 @@ tests += {
     'tests': [
       't/001_test_json_parser_incremental.pl',
       't/002_inline.pl',
-      't/003_test_semantic.pl'
+      't/003_test_semantic.pl',
+      't/004_test_parser_perf.pl'
     ],
   },
 }

src/test/modules/test_json_parser/t/004_test_parser_perf.pl

@@ -0,0 +1,35 @@
+
+use strict;
+use warnings;
+
+use PostgreSQL::Test::Utils;
+use Test::More;
+use FindBin;
+
+use File::Temp qw(tempfile);
+
+my $test_file = "$FindBin::RealBin/../tiny.json";
+
+my $exe = "test_json_parser_perf";
+
+my $contents = slurp_file($test_file);
+
+my ($fh, $fname) = tempfile(UNLINK => 1);
+
+# repeat the input json file 50 times in an array
+
+print $fh, '[', $contents , ",$contents" x 49 , ']';
+
+close($fh);
+
+# but only do one iteration
+
+my ($result) = run_log([ $exe, "1",  $fname ] );
+
+ok($result == 0, "perf test runs with RD parser");
+
+$result = run_log([ $exe, "-i" , "1",  $fname ]);
+
+ok($result == 0, "perf test runs with table driven parser");
+
+done_testing();