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Test Info:

// META: title=without start()
async_test(function(t) {
var channel = new MessageChannel();
channel.port1.postMessage(1);
var i = 0;
channel.port2.addEventListener('message', function() { i++; }, false);
setTimeout(t.step_func(function() { assert_equals(i, 0); t.done();}), 50);
});