postMessage("Test started.");

// After all the expected timeouts fire, signal the main page the test is complete.
var expectedFiringCount = 5;
function checkCompletion()
{
    if (--expectedFiringCount == 0)
        postMessage("DONE");
}

// Execute script in a string.
setTimeout('postMessage("PASS: timeout 1"); checkCompletion()', 20);

// Execute a function. 
// Note it has the same timeout value as previous timeout, but should be fired reliably
// after it because the timer heap maintains the queueing order as well as firing time.
setTimeout(function () {
               postMessage("PASS: timeout 2");
               checkCompletion();
           }, 20);

// Clear a timeout before it fires.
var singleShot = setTimeout('postMessage("FAIL: this timer should be removed before firing")', 0);
clearTimeout(singleShot);

// Clear interval after it fires.
var intervalTimer = setInterval('postMessage("PASS: interval 3"); clearInterval(intervalTimer); checkCompletion();', 20);

// Set repeated interval. It will terminate the test after 2 iterations.
setInterval('postMessage("PASS: repeated interval"); checkCompletion();', 30);