import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

dom/base/test/browser_messagemanager_loadprocessscript.js

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+var ppmm = Cc["@mozilla.org/parentprocessmessagemanager;1"]
+           .getService(Ci.nsIMessageBroadcaster);
+ppmm.QueryInterface(Ci.nsIProcessScriptLoader);
+
+function processScript() {
+  let cpmm = Components.classes["@mozilla.org/childprocessmessagemanager;1"]
+           .getService(Components.interfaces.nsISyncMessageSender);
+  if (cpmm !== this) {
+    dump("Test failed: wrong global object\n");
+    return;
+  }
+
+  this.cpmm = cpmm;
+
+  addMessageListener("ProcessTest:Reply", function listener(msg) {
+    removeMessageListener("ProcessTest:Reply", listener);
+    sendAsyncMessage("ProcessTest:Finished");
+  });
+  sendSyncMessage("ProcessTest:Loaded");
+}
+var processScriptURL = "data:,(" + processScript.toString() + ")()";
+
+function initTestScript() {
+  let init = initialProcessData;
+  if (init.test123 != "hello") {
+    dump("Initial data incorrect\n");
+    return;
+  }
+
+  sendAsyncMessage("ProcessTest:InitGood", init.test456.get("hi"));
+}
+var initTestScriptURL = "data:,(" + initTestScript.toString() + ")()";
+
+var checkProcess = Task.async(function*(mm) {
+  let { target } = yield promiseMessage(mm, "ProcessTest:Loaded");
+  target.sendAsyncMessage("ProcessTest:Reply");
+  yield promiseMessage(target, "ProcessTest:Finished");
+  ok(true, "Saw process finished");
+});
+
+function promiseMessage(messageManager, message) {
+  return new Promise(resolve => {
+    let listener = (msg) => {
+      messageManager.removeMessageListener(message, listener);
+      resolve(msg);
+    };
+
+    messageManager.addMessageListener(message, listener);
+  })
+}
+
+// Test that loading a process script loads in all existing processes
+add_task(function*() {
+  let checks = [];
+  for (let i = 0; i < ppmm.childCount; i++)
+    checks.push(checkProcess(ppmm.getChildAt(i)));
+
+  ppmm.loadProcessScript(processScriptURL, false);
+  yield Promise.all(checks);
+});
+
+// Test that loading a process script loads in new processes
+add_task(function*() {
+  // This test is only relevant in e10s
+  if (!gMultiProcessBrowser)
+    return;
+
+  is(ppmm.childCount, 2, "Should be two processes at this point");
+
+  // Load something in the main process
+  gBrowser.selectedBrowser.loadURI("about:robots");
+  yield BrowserTestUtils.browserLoaded(gBrowser.selectedBrowser);
+
+  let init = ppmm.initialProcessData;
+  init.test123 = "hello";
+  init.test456 = new Map();
+  init.test456.set("hi", "bye");
+
+  // With no remote frames left we should be down to one process.
+  // However, stuff like remote thumbnails can cause a content
+  // process to exist nonetheless. This should be rare, though,
+  // so the test is useful most of the time.
+  if (ppmm.childCount == 1) {
+    let mainMM = ppmm.getChildAt(0);
+
+    let check = checkProcess(ppmm);
+    ppmm.loadProcessScript(processScriptURL, true);
+
+    // The main process should respond
+    yield check;
+
+    check = checkProcess(ppmm);
+    // Reset the default browser to start a new child process
+    gBrowser.updateBrowserRemoteness(gBrowser.selectedBrowser, true);
+    gBrowser.selectedBrowser.loadURI("about:blank");
+    yield BrowserTestUtils.browserLoaded(gBrowser.selectedBrowser);
+
+    is(ppmm.childCount, 2, "Should be back to two processes at this point");
+
+    // The new process should have responded
+    yield check;
+
+    ppmm.removeDelayedProcessScript(processScriptURL);
+
+    let childMM;
+    childMM = ppmm.getChildAt(0) == mainMM ? ppmm.getChildAt(1) : ppmm.getChildAt(0);
+
+    childMM.loadProcessScript(initTestScriptURL, false);
+    let msg = yield promiseMessage(childMM, "ProcessTest:InitGood");
+    is(msg.data, "bye", "initial process data was correct");
+  } else {
+    info("Unable to finish test entirely");
+  }
+});