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diff --git a/netwerk/test/unit/test_bug1355539_http1.js b/netwerk/test/unit/test_bug1355539_http1.js
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+// test bug 1355539.
+//
+// Summary:
+// Transactions in one pending queue are splited into two groups:
+// [(Blocking Group)|(Non Blocking Group)]
+// In each group, the transactions are ordered by its priority.
+// This test will check if the transaction's order in pending queue is correct.
+//
+// Test step:
+// 1. Create 6 dummy http requests. Server would not process responses until get
+//    all 6 requests.
+// 2. Once server receive 6 dummy requests, create another 6 http requests with the
+//    defined priority and class flag in |transactionQueue|.
+// 3. Server starts to process the 6 dummy http requests, so the client can start to
+//    process the pending queue. Server will queue those http requests and put them in
+//    |responseQueue|.
+// 4. When the server receive all 6 requests, check if the order in |responseQueue| is
+//    equal to |transactionQueue| by comparing the value of X-ID.
+
+"use strict";
+
+const { HttpServer } = ChromeUtils.import("resource://testing-common/httpd.js");
+
+var server = new HttpServer();
+server.start(-1);
+var baseURL = "http://localhost:" + server.identity.primaryPort + "/";
+var maxConnections = 0;
+var debug = false;
+var dummyResponseQueue = [];
+var responseQueue = [];
+
+function log(msg) {
+  if (!debug) {
+    return;
+  }
+
+  if (msg) {
+    dump("TEST INFO | " + msg + "\n");
+  }
+}
+
+function make_channel(url) {
+  var request = NetUtil.newChannel({
+    uri: url,
+    loadUsingSystemPrincipal: true,
+  });
+  request.QueryInterface(Ci.nsIHttpChannel);
+  return request;
+}
+
+function serverStopListener() {
+  server.stop();
+}
+
+function createHttpRequest(requestId, priority, isBlocking, callback) {
+  let uri = baseURL;
+  var chan = make_channel(uri);
+  var listner = new HttpResponseListener(requestId, callback);
+  chan.setRequestHeader("X-ID", requestId, false);
+  chan.setRequestHeader("Cache-control", "no-store", false);
+  chan.QueryInterface(Ci.nsISupportsPriority).priority = priority;
+  if (isBlocking) {
+    var cos = chan.QueryInterface(Ci.nsIClassOfService);
+    cos.addClassFlags(Ci.nsIClassOfService.Leader);
+  }
+  chan.asyncOpen(listner);
+  log("Create http request id=" + requestId);
+}
+
+function setup_dummyHttpRequests(callback) {
+  log("setup_dummyHttpRequests");
+  for (var i = 0; i < maxConnections; i++) {
+    createHttpRequest(i, i, false, callback);
+    do_test_pending();
+  }
+}
+
+var transactionQueue = [
+  {
+    requestId: 101,
+    priority: Ci.nsISupportsPriority.PRIORITY_HIGH,
+    isBlocking: true,
+  },
+  {
+    requestId: 102,
+    priority: Ci.nsISupportsPriority.PRIORITY_NORMAL,
+    isBlocking: true,
+  },
+  {
+    requestId: 103,
+    priority: Ci.nsISupportsPriority.PRIORITY_LOW,
+    isBlocking: true,
+  },
+  {
+    requestId: 104,
+    priority: Ci.nsISupportsPriority.PRIORITY_HIGH,
+    isBlocking: false,
+  },
+  {
+    requestId: 105,
+    priority: Ci.nsISupportsPriority.PRIORITY_NORMAL,
+    isBlocking: false,
+  },
+  {
+    requestId: 106,
+    priority: Ci.nsISupportsPriority.PRIORITY_LOW,
+    isBlocking: false,
+  },
+];
+
+function setup_HttpRequests() {
+  log("setup_HttpRequests");
+  // Create channels in reverse order
+  for (var i = transactionQueue.length - 1; i > -1; ) {
+    var e = transactionQueue[i];
+    createHttpRequest(e.requestId, e.priority, e.isBlocking);
+    do_test_pending();
+    --i;
+  }
+}
+
+function check_response_id(responses) {
+  for (var i = 0; i < responses.length; i++) {
+    var id = responses[i].getHeader("X-ID");
+    Assert.equal(id, transactionQueue[i].requestId);
+  }
+}
+
+function HttpResponseListener(id, onStopCallback) {
+  this.id = id;
+  this.stopCallback = onStopCallback;
+}
+
+HttpResponseListener.prototype = {
+  onStartRequest(request) {},
+
+  onDataAvailable(request, stream, off, cnt) {},
+
+  onStopRequest(request, status) {
+    log("STOP id=" + this.id);
+    do_test_finished();
+    if (this.stopCallback) {
+      this.stopCallback();
+    }
+  },
+};
+
+function setup_http_server() {
+  log("setup_http_server");
+  maxConnections = Services.prefs.getIntPref(
+    "network.http.max-persistent-connections-per-server"
+  );
+
+  var allDummyHttpRequestReceived = false;
+  // Start server; will be stopped at test cleanup time.
+  server.registerPathHandler("/", function (metadata, response) {
+    var id = metadata.getHeader("X-ID");
+    log("Server recived the response id=" + id);
+
+    response.processAsync();
+    response.setHeader("X-ID", id);
+
+    if (!allDummyHttpRequestReceived) {
+      dummyResponseQueue.push(response);
+    } else {
+      responseQueue.push(response);
+    }
+
+    if (dummyResponseQueue.length == maxConnections) {
+      log("received all dummy http requets");
+      allDummyHttpRequestReceived = true;
+      setup_HttpRequests();
+      processDummyResponse();
+    } else if (responseQueue.length == maxConnections) {
+      log("received all http requets");
+      check_response_id(responseQueue);
+      processResponses();
+    }
+  });
+
+  registerCleanupFunction(function () {
+    server.stop(serverStopListener);
+  });
+}
+
+function processDummyResponse() {
+  if (!dummyResponseQueue.length) {
+    return;
+  }
+  var resposne = dummyResponseQueue.pop();
+  resposne.finish();
+}
+
+function processResponses() {
+  while (responseQueue.length) {
+    var resposne = responseQueue.pop();
+    resposne.finish();
+  }
+}
+
+function run_test() {
+  setup_http_server();
+  setup_dummyHttpRequests(processDummyResponse);
+}