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chromium/third_party/blink/web_tests/fast/serviceworker/serviceworker-interface.html 

<!DOCTYPE html>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script>
test(function() {
  assert_true('ServiceWorker' in window,
              'the constructor should be defined');
  assert_throws_js(TypeError, function() { new ServiceWorker(); },
                   'the constructor should not be callable with "new"');
  assert_throws_js(TypeError, function() { ServiceWorker(); },
                   'the constructor should not be callable');
  assert_equals(Object.getPrototypeOf(ServiceWorker.prototype),
                EventTarget.prototype,
                'ServiceWorker should extend EventTarget');
}, 'ServiceWorker interface');
</script>