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test_readonly.html 
<!DOCTYPE HTML>
<html>
<head>
  <meta charset="utf-8">
  <title>Test for DataStore - basic operation on a readonly db</title>
  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
</head>
<body>
  <div id="container"></div>
  <script type="application/javascript;version=1.7">
  var gHostedManifestURL = 'http://test/tests/dom/datastore/tests/file_app.sjs?testToken=file_readonly.html';
  var gHostedManifestURL2 = 'http://example.com/tests/dom/datastore/tests/file_app.sjs?testToken=file_readonly.html&template=file_app2.template.webapp';
  var gGenerator = runTest();

  SpecialPowers.pushPermissions(
    [{ "type": "browser", "allow": 1, "context": document },
     { "type": "embed-apps", "allow": 1, "context": document },
     { "type": "webapps-manage", "allow": 1, "context": document }],
    function() { gGenerator.next() });

  function continueTest() {
    try { gGenerator.next(); }
    catch(e) {}
  }

  function cbError() {
    ok(false, "Error callback invoked");
    finish();
  }

  function runTest() {
    if (SpecialPowers.isMainProcess()) {
      SpecialPowers.Cu.import("resource://gre/modules/DataStoreChangeNotifier.jsm");
    }

    SpecialPowers.setAllAppsLaunchable(true);
    SpecialPowers.setBoolPref("dom.mozBrowserFramesEnabled", true);

    SpecialPowers.autoConfirmAppInstall(continueTest);
    yield undefined;

    SpecialPowers.autoConfirmAppUninstall(continueTest);
    yield undefined;

    var request = navigator.mozApps.install(gHostedManifestURL);
    request.onerror = cbError;
    request.onsuccess = continueTest;
    yield undefined;

    var app = request.result;

    request = navigator.mozApps.install(gHostedManifestURL2);
    request.onerror = cbError;
    request.onsuccess = continueTest;
    yield undefined;

    var app2 = request.result;

    var ifr = document.createElement('iframe');
    ifr.setAttribute('mozbrowser', 'true');
    ifr.setAttribute('mozapp', app2.manifestURL);
    ifr.setAttribute('src', app2.manifest.launch_path);
    var domParent = document.getElementById('container');

    // Set us up to listen for messages from the app.
    var listener = function(e) {
      var message = e.detail.message;
      if (/^OK/.exec(message)) {
        ok(true, "Message from app: " + message);
      } else if (/KO/.exec(message)) {
        ok(false, "Message from app: " + message);
      } else if (/DONE/.exec(message)) {
        ok(true, "Messaging from app complete");
        ifr.removeEventListener('mozbrowsershowmodalprompt', listener);
        domParent.removeChild(ifr);

        // Uninstall the app.
        request = navigator.mozApps.mgmt.uninstall(app);
        request.onerror = cbError;
        request.onsuccess = function() {
          // Uninstall app2
          request = navigator.mozApps.mgmt.uninstall(app2);
          request.onerror = cbError;
          request.onsuccess = function() {
            // All done.
            info("All done");
            finish();
          }
        }
      }
    }

    // This event is triggered when the app calls "alert".
    ifr.addEventListener('mozbrowsershowmodalprompt', listener, false);

    domParent.appendChild(ifr);
  }

  function finish() {
    SpecialPowers.clearUserPref("dom.mozBrowserFramesEnabled");
    SimpleTest.finish();
  }

  SimpleTest.waitForExplicitFinish();
  SpecialPowers.pushPrefEnv({"set": [["dom.datastore.enabled", true],
                                     ["dom.datastore.sysMsgOnChangeShortTimeoutSec", 1],
                                     ["dom.datastore.sysMsgOnChangeLongTimeoutSec", 3],
                                     ["dom.testing.ignore_ipc_principal", true],
                                     ["dom.testing.datastore_enabled_for_hosted_apps", true]]}, runTest);
  </script>
</body>
</html>
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