1 files changed, 48 insertions, 0 deletions
diff --git a/tests/node_compat/test/parallel/test-fs-open-mode-mask.js b/tests/node_compat/test/parallel/test-fs-open-mode-mask.js
new file mode 100644
index 000000000..4b56b3b38
--- /dev/null
+++ b/tests/node_compat/test/parallel/test-fs-open-mode-mask.js
@@ -0,0 +1,48 @@
+// 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';
+
+// This tests that the lower bits of mode > 0o777 still works in fs.open().
+
+const common = require('../common');
+const assert = require('assert');
+const path = require('path');
+const fs = require('fs');
+
+const mode = common.isWindows ? 0o444 : 0o644;
+
+const maskToIgnore = 0o10000;
+
+const tmpdir = require('../common/tmpdir');
+tmpdir.refresh();
+
+function test(mode, asString) {
+  const suffix = asString ? 'str' : 'num';
+  const input = asString ?
+    (mode | maskToIgnore).toString(8) : (mode | maskToIgnore);
+
+  {
+    const file = path.join(tmpdir.path, `openSync-${suffix}.txt`);
+    const fd = fs.openSync(file, 'w+', input);
+    assert.strictEqual(fs.fstatSync(fd).mode & 0o777, mode);
+    fs.closeSync(fd);
+    assert.strictEqual(fs.statSync(file).mode & 0o777, mode);
+  }
+
+  {
+    const file = path.join(tmpdir.path, `open-${suffix}.txt`);
+    fs.open(file, 'w+', input, common.mustSucceed((fd) => {
+      assert.strictEqual(fs.fstatSync(fd).mode & 0o777, mode);
+      fs.closeSync(fd);
+      assert.strictEqual(fs.statSync(file).mode & 0o777, mode);
+    }));
+  }
+}
+
+test(mode, true);
+test(mode, false);