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-rw-r--r--js/src/jit-test/tests/for-of/semantics-04.js17
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diff --git a/js/src/jit-test/tests/for-of/semantics-04.js b/js/src/jit-test/tests/for-of/semantics-04.js
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index 000000000..df7036de7
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+++ b/js/src/jit-test/tests/for-of/semantics-04.js
@@ -0,0 +1,17 @@
+// Giving an Array an own .iterator property affects for-of.
+
+load(libdir + "asserts.js");
+load(libdir + "iteration.js");
+
+var a = [];
+a[Symbol.iterator] = function* () {
+ yield 'o';
+ yield 'k';
+};
+var s = '';
+for (var v of a)
+ s += v;
+assertEq(s, 'ok');
+
+a[Symbol.iterator] = undefined;
+assertThrowsInstanceOf(function () { for (var v of a) ; }, TypeError);