1 files changed, 39 insertions, 0 deletions
diff --git a/tests/node_compat/test/parallel/test-buffer-zero-fill-cli.js b/tests/node_compat/test/parallel/test-buffer-zero-fill-cli.js
new file mode 100644
index 000000000..c3250b870
--- /dev/null
+++ b/tests/node_compat/test/parallel/test-buffer-zero-fill-cli.js
@@ -0,0 +1,39 @@
+// deno-fmt-ignore-file
+// deno-lint-ignore-file
+
+// Copyright Joyent and Node contributors. All rights reserved. MIT license.
+// Taken from Node 18.12.1
+// This file is automatically generated by `tools/node_compat/setup.ts`. Do not modify this file manually.
+
+'use strict';
+// Flags: --zero-fill-buffers
+
+// when using --zero-fill-buffers, every Buffer and SlowBuffer
+// instance must be zero filled upon creation
+
+require('../common');
+const SlowBuffer = require('buffer').SlowBuffer;
+const assert = require('assert');
+
+function isZeroFilled(buf) {
+  for (const n of buf)
+    if (n > 0) return false;
+  return true;
+}
+
+// This can be somewhat unreliable because the
+// allocated memory might just already happen to
+// contain all zeroes. The test is run multiple
+// times to improve the reliability.
+for (let i = 0; i < 50; i++) {
+  const bufs = [
+    Buffer.alloc(20),
+    Buffer.allocUnsafe(20),
+    SlowBuffer(20),
+    Buffer(20),
+    new SlowBuffer(20),
+  ];
+  for (const buf of bufs) {
+    assert(isZeroFilled(buf));
+  }
+}