gecko/toolkit/mozapps/extensions/test/xpinstall/browser_softwareupdate.js

// ----------------------------------------------------------------------------
// Tests that calling InstallTrigger.startSoftwareUpdate works
function test() {
  Harness.installEndedCallback = install_ended;
  Harness.installsCompletedCallback = finish_test;
  Harness.setup();

  var pm = Services.perms;
  pm.add(makeURI("http://example.com/"), "install", pm.ALLOW_ACTION);

  gBrowser.selectedTab = gBrowser.addTab();
  gBrowser.loadURI(TESTROOT + "startsoftwareupdate.html? " + encodeURIComponent(TESTROOT + "unsigned.xpi"));
}

function install_ended(install, addon) {
  install.cancel();
}

function finish_test(count) {
  is(count, 1, "1 Add-on should have been successfully installed");
  Services.perms.remove("example.com", "install");

  gBrowser.removeCurrentTab();
  Harness.finish();
}