<html>
<head>
<script src="resources/sw-test-pre.js"></script>
</head>
<body>
<script>

function waitForMessageEvent()
{
    return new Promise(resolve => {
        navigator.serviceWorker.addEventListener('message', resolve, { once: true });
    });
}

async function test()
{
    try {
         let registration1 = await navigator.serviceWorker.register("resources/basic-unregister-then-register-again-reuse-worker.js", { });
         await waitForState(registration1.installing, "activated");
         if (registration1.installing)
             log("FAIL: registration1 should not have an installing worker");
         else
             log("PASS: registration1 should not have an installing worker");

         if (registration1.waiting)
             log("FAIL: registration1 should not have a waiting worker");
         else
             log("PASS: registration1 should not have a waiting worker");

         if (registration1.active)
             log("PASS: registration1 should have an active worker");
         else
             log("FAIL: registration1 should have an active worker");

         // Service worker will use waitUntil() on the received ExtendableMessageEvent to extend its lifetime.
         registration1.active.postMessage("ExtendLifetime");

         await waitForMessageEvent();
         await registration1.unregister();

         let registration2 = await navigator.serviceWorker.register("resources/basic-unregister-then-register-again-reuse-worker.js", { });
         if (registration1 === registration2)
             log("PASS: Registration was reused");
         else
             log("FAIL: Registration was not reused");
    } catch (e) {
        log("FAIL: Got exception " + e);
    }
    finishSWTest();
}

test();
</script>
</body>
</html>