From 39df358fc8192cdfdfa31e8243f5ac46653127ed Mon Sep 17 00:00:00 2001
From: Eugene Lazutkin <eugene.lazutkin@gmail.com>
Date: Sat, 8 Jun 2024 16:26:39 -0500
Subject: [PATCH] Added a perf test to check that the caching works.

* Uses `matchAll()`, which runs repeated operations on the same string.
* Changing the string size should exhibit a near linear behavior.
* (With high numbers we measure Node's GC and had to recreate the cache).
---
 tests/manual/matchall-bench.js | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)
 create mode 100644 tests/manual/matchall-bench.js

diff --git a/tests/manual/matchall-bench.js b/tests/manual/matchall-bench.js
new file mode 100644
index 0000000..4990287
--- /dev/null
+++ b/tests/manual/matchall-bench.js
@@ -0,0 +1,16 @@
+'use strict';
+
+const RE2 = require('../../re2');
+
+const N = 1_000_000;
+
+const s = 'a'.repeat(N),
+  re = new RE2('a', 'g'),
+  matches = s.matchAll(re);
+
+let n = 0;
+for (const _ of matches) ++n;
+
+if (n !== s.length) console.log('Wrong result.');
+
+console.log('Done.');