1 files changed, 42 insertions, 0 deletions
diff --git a/js/src/tests/non262/TypedArray/iterator.js b/js/src/tests/non262/TypedArray/iterator.js
new file mode 100644
index 0000000000..3f943aa70d
--- /dev/null
+++ b/js/src/tests/non262/TypedArray/iterator.js
@@ -0,0 +1,42 @@
+// Ensure that we're using [[ArrayLength]] to determine the number of
+// values to produce instead of the length property.
+
+function testIterationCount(iterator, expectedLength) {
+    for (let i = 0; i < expectedLength; i++)
+        assertEq(iterator.next().done, false);
+    assertEq(iterator.next().done, true);
+}
+
+let i8Array = new Int8Array(4);
+Object.defineProperty(i8Array, "length", {value: 0});
+let i8Iterator = i8Array[Symbol.iterator]();
+testIterationCount(i8Iterator, 4);
+
+// Veryify that the length property isn't even touched
+i8Array = new Int8Array();
+Object.defineProperty(i8Array, "length", {
+    get() {
+        throw TypeError;
+    }
+});
+i8Iterator = i8Array[Symbol.iterator]();
+testIterationCount(i8Iterator, 0);
+
+// Verify that it works for set as well
+i8Array = new Uint8Array(1);
+// Try setting a high length which would trigger failure
+Object.defineProperty(i8Array, "length", {value: 15});
+// Works if the fake length is ignored
+(new Uint8Array(4)).set(i8Array, 3);
+
+// Ensure that it works across globals
+let g2 = newGlobal();
+
+i8Array = new Int8Array(8);
+Object.defineProperty(i8Array, "length", {value: 0});
+let iterator = i8Array[Symbol.iterator]();
+iterator.next = g2.Array.prototype[Symbol.iterator]().next;
+testIterationCount(iterator, 8);
+
+if (typeof reportCompare === "function")
+    reportCompare(true, true);