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chromium/third_party/blink/web_tests/fast/events/before-unload-return-bad-value.html 

<!DOCTYPE html>
<html>
<head>
<script src="../../resources/js-test.js"></script>
<script>
description("Tests that an exception is thrown when the value returned in the beforeunload callback cannot be converted to a String");
window.jsTestIsAsync = true;

var testMessage;
var alreadyTested = false;
function test(frame) {
    if (alreadyTested)
        return;
    alreadyTested = true;

    frame.contentWindow.onbeforeunload = function(event) {
        // This exception should be caught by |window.onerror|, not
        // |frame.contentWindow.onerror| in this test case.
        return {toString: function() { throw "Exception in toString()"; }};
    };

    window.onerror = function(msg) {
        testMessage = msg;
        testPassed("Exception was thrown");
        shouldBeEqualToString("testMessage", "Uncaught Exception in toString()");
        return true;
    };

    frame.contentWindow.location.href = "resources/does-not-exist.html";
    setTimeout(function() {
        window.stop();
        finishJSTest();
    }, 0);
}
</script>
</head>
<body>
<iframe onload="test(this)" src="resources/onclick.html"></iframe>
</body>
</html>