gecko-dev/netwerk/test/unit/test_cache_jar.js

const Cc = Components.classes;
const Ci = Components.interfaces;
const Cu = Components.utils;
const Cr = Components.results;

Cu.import("resource://testing-common/httpd.js");
Cu.import("resource://gre/modules/Services.jsm");
Cu.import("resource://gre/modules/XPCOMUtils.jsm");

var httpserv = null;
var handlers_called = 0;

function cached_handler(metadata, response) {
  response.setHeader("Content-Type", "text/plain", false);
  response.setHeader("Cache-Control", "max-age=10000", false);
  response.setStatusLine(metadata.httpVersion, 200, "OK");
  var body = "0123456789";
  response.bodyOutputStream.write(body, body.length);
  handlers_called++;
}

function makeChan(url, appId, inBrowser) {
  var ios = Cc["@mozilla.org/network/io-service;1"].getService(Ci.nsIIOService);
  var chan = ios.newChannel(url, null, null).QueryInterface(Ci.nsIHttpChannel);
  chan.notificationCallbacks = {
    appId: appId,
    isInBrowserElement: inBrowser,
    QueryInterface: function(iid) {
      if (iid.equals(Ci.nsILoadContext))
        return this;
      throw Cr.NS_ERROR_NO_INTERFACE;
    },
    getInterface: function(iid) { return this.QueryInterface(iid); }
  };
  return chan;
}

var firstTests = [[0, false, 1], [0, true, 1], [1, false, 1], [1, true, 1]];
var secondTests = [[0, false, 0], [0, true, 0], [1, false, 0], [1, true, 1]];
var thirdTests = [[0, false, 0], [0, true, 0], [1, false, 1], [1, true, 1]];

function run_all_tests() {
  for (let test of firstTests) {
    handlers_called = 0;
    var chan = makeChan("http://localhost:4444/cached", test[0], test[1]);
    chan.asyncOpen(new ChannelListener(doneFirstLoad, test[2]), null);
    yield;
  }

  // We can't easily cause webapp data to be cleared from the child process, so skip
  // the rest of these tests.
  let procType = Cc["@mozilla.org/xre/runtime;1"].getService(Ci.nsIXULRuntime).processType;
  if (procType != Ci.nsIXULRuntime.PROCESS_TYPE_DEFAULT)
    return;

  let subject = {
    appId: 1,
    browserOnly: true,
    QueryInterface: XPCOMUtils.generateQI([Ci.mozIApplicationClearPrivateDataParams])
  };
  Services.obs.notifyObservers(subject, "webapps-clear-data", null);

  for (let test of secondTests) {
    handlers_called = 0;
    var chan = makeChan("http://localhost:4444/cached", test[0], test[1]);
    chan.asyncOpen(new ChannelListener(doneFirstLoad, test[2]), null);
    yield;
  }

  subject = {
    appId: 1,
    browserOnly: false,
    QueryInterface: XPCOMUtils.generateQI([Ci.mozIApplicationClearPrivateDataParams])
  };
  Services.obs.notifyObservers(subject, "webapps-clear-data", null);

  for (let test of thirdTests) {
    handlers_called = 0;
    var chan = makeChan("http://localhost:4444/cached", test[0], test[1]);
    chan.asyncOpen(new ChannelListener(doneFirstLoad, test[2]), null);
    yield;
  }
}

let gTests;
function run_test() {
  do_test_pending();
  httpserv = new HttpServer();
  httpserv.registerPathHandler("/cached", cached_handler);
  httpserv.start(4444);
  gTests = run_all_tests();
  gTests.next();
}

function doneFirstLoad(req, buffer, expected) {
  // Load it again, make sure it hits the cache
  var chan = makeChan("http://localhost:4444/cached", 0, false);
  chan.asyncOpen(new ChannelListener(doneSecondLoad, expected), null);
}

function doneSecondLoad(req, buffer, expected) {
  do_check_eq(handlers_called, expected);
  try {
    gTests.next();
  } catch (x) {
    do_test_finished();
  }
}