1 files changed, 25 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Array/prototype/findLastIndex/return-abrupt-from-this-length-as-symbol.js b/js/src/tests/test262/built-ins/Array/prototype/findLastIndex/return-abrupt-from-this-length-as-symbol.js
new file mode 100644
index 0000000000..f3b1275072
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Array/prototype/findLastIndex/return-abrupt-from-this-length-as-symbol.js
@@ -0,0 +1,25 @@
+// Copyright (C) 2021 Microsoft. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-array.prototype.findlastindex
+description: >
+  Return abrupt from ToLength(Get(O, "length")) where length is a Symbol.
+info: |
+  Array.prototype.findLastIndex ( predicate[ , thisArg ] )
+
+  1. Let O be ? ToObject(this value).
+  2. Let len be ? LengthOfArrayLike(O).
+  ...
+features: [Symbol, array-find-from-last]
+---*/
+
+var o = {};
+
+o.length = Symbol(1);
+
+// predicate fn is given to avoid false positives
+assert.throws(TypeError, function() {
+  [].findLastIndex.call(o, function() {});
+});
+
+reportCompare(0, 0);