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test(() => assert_throws_js(TypeError, () => new BroadcastChannel()), 'Should throw if no name is provided'); test(() => { let c = new BroadcastChannel(null); assert_equals(c.name, 'null'); }, 'Null name should not throw'); test(() => { let c = new BroadcastChannel(undefined); assert_equals(c.name, 'undefined'); }, 'Undefined name should not throw'); test(() => { let c = new BroadcastChannel('fooBar'); assert_equals(c.name, 'fooBar'); }, 'Non-empty name should not throw'); test(() => { let c = new BroadcastChannel(123); assert_equals(c.name, '123'); }, 'Non-string name should not throw'); test(() => { let c = new BroadcastChannel(''); assert_throws_js(TypeError, () => c.postMessage()); }, 'postMessage without parameters should throw'); test(() => { let c = new BroadcastChannel(''); c.postMessage(null); }, 'postMessage with null should not throw'); test(() => { let c = new BroadcastChannel(''); c.close(); }, 'close should not throw'); test(() => { let c = new BroadcastChannel(''); c.close(); c.close(); }, 'close should not throw when called multiple times'); test(() => { let c = new BroadcastChannel(''); c.close(); assert_throws_dom('InvalidStateError', () => c.postMessage('')); }, 'postMessage after close should throw'); test(() => { let c = new BroadcastChannel(''); assert_not_equals(c.onmessage, undefined); }, 'BroadcastChannel should have an onmessage event'); test(() => { let c = new BroadcastChannel(''); assert_throws_dom('DataCloneError', () => c.postMessage(Symbol())); }, 'postMessage should throw with uncloneable data'); test(() => { let c = new BroadcastChannel(''); c.close(); assert_throws_dom('InvalidStateError', () => c.postMessage(Symbol())); }, 'postMessage should throw InvalidStateError after close, even with uncloneable data');