1 files changed, 32 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Array/prototype/with/length-tolength.js b/js/src/tests/test262/built-ins/Array/prototype/with/length-tolength.js
new file mode 100644
index 0000000000..2573c8532f
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Array/prototype/with/length-tolength.js
@@ -0,0 +1,32 @@
+// Copyright (C) 2021 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-array.prototype.with
+description: >
+  Array.prototype.with converts the this value length to a number.
+info: |
+  Array.prototype.with ( index, value )
+
+  ...
+  2. Let len be ? LengthOfArrayLike(O).
+  ...
+features: [change-array-by-copy]
+includes: [compareArray.js]
+---*/
+
+var arrayLike = { length: "2", 0: 1, 1: 2, 2: 3 };
+assert.compareArray(Array.prototype.with.call(arrayLike, 0, 4), [4, 2]);
+
+var arrayLike = {
+  length: {
+    valueOf: () => 2
+  },
+  0: 1,
+  1: 2,
+  2: 3,
+};
+
+assert.compareArray(Array.prototype.with.call(arrayLike, 0, 4), [4, 2]);
+
+reportCompare(0, 0);