From 90ecc9baa2321c2195a084140fd52c124b31c770 Mon Sep 17 00:00:00 2001
From: Tony Gorez <gorez.tony@gmail.com>
Date: Mon, 28 Mar 2022 22:15:08 +0200
Subject: [PATCH] test: add trace-gc flag test
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PR-URL: https://github.com/nodejs/node/pull/42471
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Gerhard Stöbich <deb2001-github@yahoo.de>
---
 test/fixtures/gc.js                   |  9 ++++++
 test/v8-updates/test-trace-gc-flag.js | 40 +++++++++++++++++++++++++++
 2 files changed, 49 insertions(+)
 create mode 100644 test/fixtures/gc.js
 create mode 100644 test/v8-updates/test-trace-gc-flag.js

diff --git a/test/fixtures/gc.js b/test/fixtures/gc.js
new file mode 100644
index 00000000000000..1e965f336e4dea
--- /dev/null
+++ b/test/fixtures/gc.js
@@ -0,0 +1,9 @@
+let arr = new Array(300_000).fill('a');
+
+for (let index = 0; index < arr.length; index++) {
+  arr[index] = Math.random();
+}
+
+arr = [];
+// .gc() is called to generate a Mark-sweep event
+global.gc();
diff --git a/test/v8-updates/test-trace-gc-flag.js b/test/v8-updates/test-trace-gc-flag.js
new file mode 100644
index 00000000000000..d84e359525127c
--- /dev/null
+++ b/test/v8-updates/test-trace-gc-flag.js
@@ -0,0 +1,40 @@
+'use strict';
+
+// This test verifies that `--trace-gc` flag is well integrated.
+// We'll check here, that the console outputs gc events properly.
+require('../common');
+
+const assert = require('assert');
+const { spawnSync } = require('child_process');
+
+const fixtures = require('../common/fixtures');
+
+{
+  const childProcess = spawnSync(process.execPath, [
+    '--trace-gc',
+    '--expose-gc',
+    fixtures.path('gc.js'),
+  ]);
+  const output = childProcess.stdout.toString().trim();
+  const lines = splitByLine(output);
+
+  const scavengeRegex = /\bScavenge\b/;
+  const expectedOutput = [
+    scavengeRegex,
+    scavengeRegex,
+    scavengeRegex,
+    scavengeRegex,
+    /\bMark-sweep\b/,
+  ];
+  lines.forEach((line, index) => {
+    assert.match(line, expectedOutput[index]);
+  });
+}
+
+/**
+ * HELPERS
+ */
+
+function splitByLine(str) {
+  return str.split(/\n/);
+}