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diff --git a/js/src/jit-test/tests/for-of/array-iterator-surfaces-1.js b/js/src/jit-test/tests/for-of/array-iterator-surfaces-1.js
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+++ b/js/src/jit-test/tests/for-of/array-iterator-surfaces-1.js
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+// Superficial tests of the Array.prototype[@@iterator] builtin function and its workalikes.
+
+load(libdir + "iteration.js");
+
+var constructors = [Array, String, Uint8Array, Uint8ClampedArray];
+for (var c of constructors) {
+ assertEq(c.prototype[Symbol.iterator].length, 0);
+
+ var loc = (c === Array || c === String)
+ ? c.prototype
+ : Object.getPrototypeOf(c.prototype);
+
+ var desc = Object.getOwnPropertyDescriptor(loc, Symbol.iterator);
+ assertEq(desc.configurable, true);
+ assertEq(desc.enumerable, false);
+ assertEq(desc.writable, true);
+}