1 files changed, 29 insertions, 0 deletions
diff --git a/js/src/tests/non262/Tuple/prototype/toReversed/toReversed.js b/js/src/tests/non262/Tuple/prototype/toReversed/toReversed.js
new file mode 100644
index 0000000000..2c672ef1ce
--- /dev/null
+++ b/js/src/tests/non262/Tuple/prototype/toReversed/toReversed.js
@@ -0,0 +1,29 @@
+// |reftest| skip-if(!this.hasOwnProperty("Tuple"))
+/*
+8.2.3.28 Tuple.prototype.toReversed ( )
+When the toReversed method is called, the following steps are taken:
+
+1. Let T be ? thisTupleValue(this value).
+2. Let oldList be a new List containing the elements of T.[[Sequence]].
+3. Let newList be a new empty List.
+4. Repeat, while oldList is not empty,
+a. Remove the last element from oldList, and let E be the value of the element.
+b. Append E to the end of List newList.
+5. Return a new Tuple value whose [[Sequence]] is newList.
+*/
+/* Step 1 */
+/* toReversed() should throw on a non-Tuple */
+let method = Tuple.prototype.toReversed;
+assertEq(method.call(#[1,2,3,4,5,6]), #[6,5,4,3,2,1]);
+assertEq(method.call(Object(#[1,2,3,4,5,6])), #[6,5,4,3,2,1]);
+assertThrowsInstanceOf(() => method.call("monkeys"), TypeError,
+                       "value of TupleObject must be a Tuple");
+
+assertEq(#[].toReversed(), #[]);
+assertEq(#[1].toReversed(), #[1]);
+
+/* Test that length is still handled correctly if it's overridden */
+Object.defineProperty(Tuple.prototype, "length", { get() { return 0 } })
+assertEq(#[1,2,3,4,5].toReversed(), #[5,4,3,2,1]);
+
+reportCompare(0, 0);