import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

browser/components/sessionstore/test/browser_async_flushes.js

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+"use strict";
+
+const URL = "data:text/html;charset=utf-8,<a href=%23>clickme</a>";
+
+add_task(function* test_flush() {
+  // Create new tab.
+  let tab = gBrowser.addTab(URL);
+  let browser = tab.linkedBrowser;
+  yield promiseBrowserLoaded(browser);
+
+  // Flush to empty any queued update messages.
+  yield TabStateFlusher.flush(browser);
+
+  // There should be one history entry.
+  let {entries} = JSON.parse(ss.getTabState(tab));
+  is(entries.length, 1, "there is a single history entry");
+
+  // Click the link to navigate, this will add second shistory entry.
+  yield ContentTask.spawn(browser, null, function* () {
+    return new Promise(resolve => {
+      addEventListener("hashchange", function onHashChange() {
+        removeEventListener("hashchange", onHashChange);
+        resolve();
+      });
+
+      // Click the link.
+      content.document.querySelector("a").click();
+    });
+  });
+
+  // Flush to empty any queued update messages.
+  yield TabStateFlusher.flush(browser);
+
+  // There should be two history entries now.
+  ({entries} = JSON.parse(ss.getTabState(tab)));
+  is(entries.length, 2, "there are two shistory entries");
+
+  // Cleanup.
+  gBrowser.removeTab(tab);
+});
+
+add_task(function* test_crash() {
+  // Create new tab.
+  let tab = gBrowser.addTab(URL);
+  gBrowser.selectedTab = tab;
+  let browser = tab.linkedBrowser;
+  yield promiseBrowserLoaded(browser);
+
+  // Flush to empty any queued update messages.
+  yield TabStateFlusher.flush(browser);
+
+  // There should be one history entry.
+  let {entries} = JSON.parse(ss.getTabState(tab));
+  is(entries.length, 1, "there is a single history entry");
+
+  // Click the link to navigate.
+  yield ContentTask.spawn(browser, null, function* () {
+    return new Promise(resolve => {
+      addEventListener("hashchange", function onHashChange() {
+        removeEventListener("hashchange", onHashChange);
+        resolve();
+      });
+
+      // Click the link.
+      content.document.querySelector("a").click();
+    });
+  });
+
+  // Crash the browser and flush. Both messages are async and will be sent to
+  // the content process. The "crash" message makes it first so that we don't
+  // get a chance to process the flush. The TabStateFlusher however should be
+  // notified so that the flush still completes.
+  let promise1 = BrowserTestUtils.crashBrowser(browser);
+  let promise2 = TabStateFlusher.flush(browser);
+  yield Promise.all([promise1, promise2]);
+
+  // The pending update should be lost.
+  ({entries} = JSON.parse(ss.getTabState(tab)));
+  is(entries.length, 1, "still only one history entry");
+
+  // Cleanup.
+  gBrowser.removeTab(tab);
+});
+
+add_task(function* test_remove() {
+  // Create new tab.
+  let tab = gBrowser.addTab(URL);
+  let browser = tab.linkedBrowser;
+  yield promiseBrowserLoaded(browser);
+
+  // Flush to empty any queued update messages.
+  yield TabStateFlusher.flush(browser);
+
+  // There should be one history entry.
+  let {entries} = JSON.parse(ss.getTabState(tab));
+  is(entries.length, 1, "there is a single history entry");
+
+  // Click the link to navigate.
+  yield ContentTask.spawn(browser, null, function* () {
+    return new Promise(resolve => {
+      addEventListener("hashchange", function onHashChange() {
+        removeEventListener("hashchange", onHashChange);
+        resolve();
+      });
+
+      // Click the link.
+      content.document.querySelector("a").click();
+    });
+  });
+
+  // Request a flush and remove the tab. The flush should still complete.
+  yield Promise.all([TabStateFlusher.flush(browser), promiseRemoveTab(tab)]);
+})