test/script/basic/NASHORN-433.js

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/**
 * NASHORN-433 : Array iteration for methods like Array.prototype.forEach should compute length before checking whether the callback is a function
 *
 * @test
 * @run
 */

var obj = { "0": 33, "1": 2 };
Object.defineProperty(obj, "length", {
    get: function() { throw new ReferenceError(); }
});

try {
    Array.prototype.forEach.call(obj, undefined);
    fail("should have thrown error");
} catch (e) {
    // length should be obtained before checking if callback
    // is really a function or not. So, we should get error
    // from length getter rather than TypeError for callback.
    if (! (e instanceof ReferenceError)) {
        fail("ReferenceError expected, got " + e);
    }
}