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chromium/third_party/blink/web_tests/external/wpt/workers/constructors/SharedWorker/SharedWorker-constructor.html 

<!DOCTYPE html>
<title>Test SharedWorker constructor functionality.</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
test(() => {
  assert_throws_js(Error,
                   function() {
                     new SharedWorker({toString:function(){throw new Error()}})},
                   'toString exception should be propagated');
}, 'Test toString propagation exception.');

test(() => {
  assert_throws_js(TypeError,
                   function() { new SharedWorker(); },
                   'invoking SharedWorker constructor without arguments should result ' +
                   'in an exception.')
}, 'Test Sharedworker creation with no arguments');


test(() => {
  assert_throws_dom("SyntaxError",
                    function() { var Sharedworker = new SharedWorker('http://invalid:123$'); },
                    'Invoking SharedWorker constructor with invalid script URL should ' +
                    'result in an exception.');
}, 'Test invalid script URL.');

</script>