toolkit/components/alerts/test/test_alerts_noobserve.html

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<head>
  <title>Test for Alerts Service</title>
  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script> 
  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
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<p id="display"></p>

<br>Alerts service, without observer "asynchronous" case.
<br>
<br>A notification should soon appear somewhere.
<br>If there has been no crash when the notification (later) disappears, assume all is good.

<pre id="test">
<script class="testbody" type="text/javascript">

const Cc = SpecialPowers.Cc;
const Ci = SpecialPowers.Ci;

const wm = Cc["@mozilla.org/appshell/window-mediator;1"]
             .getService(Ci.nsIWindowMediator);

function anyXULAlertsVisible() {
  var windows = wm.getEnumerator('alert:alert');
  return windows.hasMoreElements();
}

function waitForAlertsThenFinish() {
  if (anyXULAlertsVisible()) {
    setTimeout(waitForAlertsThenFinish, 1000);
  } else {
    ok(true, "Alert disappeared.");
    SimpleTest.finish();
  }
}

function runTest() {
  if (!("@mozilla.org/alerts-service;1" in Cc)) {
    todo(false, "Alerts service does not exist in this application");
  } else {
    ok(true, "Alerts service exists in this application");

    var notifier;
    try {
      notifier = Cc["@mozilla.org/alerts-service;1"].
                 getService(Ci.nsIAlertsService);
      ok(true, "Alerts service is available");
    } catch (ex) {
      todo(false, "Alerts service is not available.", ex);
    }

    if (notifier) {
      try {
        notifier.showAlertNotification(null, "Notification test",
                                       "This notification has no observer");
        ok(true, "showAlertNotification() succeeded");
      } catch (ex) {
        todo(false, "showAlertNotification() failed.", ex);
      }
    }
  }
}

SimpleTest.waitForExplicitFinish();
SimpleTest.requestFlakyTimeout("untriaged");
ok(!anyXULAlertsVisible(), "Alerts should not be present at the start of the test.");
runTest();
setTimeout(waitForAlertsThenFinish, 1000);
</script>
</pre>
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