1 files changed, 37 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Array/prototype/lastIndexOf/length-near-integer-limit.js b/js/src/tests/test262/built-ins/Array/prototype/lastIndexOf/length-near-integer-limit.js
new file mode 100644
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+++ b/js/src/tests/test262/built-ins/Array/prototype/lastIndexOf/length-near-integer-limit.js
@@ -0,0 +1,37 @@
+// Copyright (C) 2020 Alexey Shvayka. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-array.prototype.lastindexof
+description: >
+  Elements are found in an array-like object
+  whose "length" property is near the integer limit.
+info: |
+  Array.prototype.lastIndexOf ( searchElement [ , fromIndex ] )
+
+  1. Let O be ? ToObject(this value).
+  2. Let len be ? LengthOfArrayLike(O).
+  [...]
+  7. Repeat, while k ≥ 0
+    a. Let kPresent be ? HasProperty(O, ! ToString(k)).
+    b. If kPresent is true, then
+      i. Let elementK be ? Get(O, ! ToString(k)).
+      ii. Let same be the result of performing Strict Equality Comparison searchElement === elementK.
+      iii. If same is true, return k.
+    [...]
+---*/
+
+var el = {};
+var elIndex = Number.MAX_SAFE_INTEGER - 3;
+var fromIndex = Number.MAX_SAFE_INTEGER - 1;
+var arrayLike = {
+  length: Number.MAX_SAFE_INTEGER,
+};
+
+arrayLike[elIndex] = el;
+
+var res = Array.prototype.lastIndexOf.call(arrayLike, el, fromIndex);
+
+assert.sameValue(res, elIndex);
+
+reportCompare(0, 0);