LayoutTests/js/pic/cached-single-entry-transition.html

<p>
This page verifies that the single property optimization doesn't cause similar
looking objects to be given the same structure identifiers. If the test passes,
you'll see a PASS message below.
</p>

<pre id="console"></pre>

<script>
(function() {
    if (window.testRunner)
        testRunner.dumpAsText();

    function log(s)
    {
        if (this.document)
            document.getElementById("console").appendChild(document.createTextNode(s + "\n"));
        else
            print(s + "\n");
    }
    
    function shouldBe(a, aDescription, b)
    {
        if (a === b) {
            log("PASS: " + aDescription + " should be " + b + " and is.");
        } else {
            log("FAIL: " + aDescription + " should be " + b + " but instead is " + a + ".");
        }
    }
    
    function getA(o)
    {
        return o.a;
    }
    
    var o1 = { a: 1, x: 1 };
    var o2 = { b: 1, x: 1 };
    
    getA(o1);
    getA(o1);
    
    shouldBe(getA(o2), "getA(o2)", undefined);
})();
</script>