Event-dispatch-throwing.html

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This WPT test may be referenced by the following Test IDs:
- /dom/events/Event-dispatch-throwing.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset="UTF-8">

<title>Throwing in event listeners</title>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<div id="log"></div>

<script>

setup({allow_uncaught_exception:true})

test(function() {

    var errorEvents = 0;

    window.onerror = this.step_func(function(e) {

        assert_equals(typeof e, 'string');

        ++errorEvents;

});

    var element = document.createElement('div');

    element.addEventListener('click', function() {

        throw new Error('Error from only listener');

});

    element.dispatchEvent(new Event('click'));

    assert_equals(errorEvents, 1);

}, "Throwing in event listener with a single listeners");

test(function() {

    var errorEvents = 0;

    window.onerror = this.step_func(function(e) {

        assert_equals(typeof e, 'string');

        ++errorEvents;

});

    var element = document.createElement('div');

    var secondCalled = false;

    element.addEventListener('click', function() {

        throw new Error('Error from first listener');

});

    element.addEventListener('click', this.step_func(function() {

        secondCalled = true;

    }), false);

    element.dispatchEvent(new Event('click'));

    assert_equals(errorEvents, 1);

    assert_true(secondCalled);

}, "Throwing in event listener with multiple listeners");

</script>