Bug 1162871 - Test that duplicateTab() does wait for the flush to complete and includes flushed data r=billm

browser/components/sessionstore/test/browser.ini

@@ -65,6 +65,7 @@ support-files =
 
 [browser_aboutPrivateBrowsing.js]
 [browser_aboutSessionRestore.js]
+[browser_async_duplicate_tab.js]
 [browser_async_remove_tab.js]
 run-if = e10s
 [browser_attributes.js]

browser/components/sessionstore/test/browser_454908.js

@@ -3,10 +3,6 @@
 
 "use strict";
 
-let tmp = {};
-Cu.import("resource:///modules/sessionstore/SessionSaver.jsm", tmp);
-let {SessionSaver} = tmp;
-
 const URL = ROOT + "browser_454908_sample.html";
 const PASS = "pwd-" + Math.random();
 

browser/components/sessionstore/test/browser_async_duplicate_tab.js

@@ -0,0 +1,78 @@
+"use strict";
+
+const URL = "data:text/html;charset=utf-8,<a href=%23>clickme</a>";
+
+add_task(function* test_duplicate() {
+  // 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);
+
+  // 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();
+    });
+  });
+
+  // Duplicate the tab.
+  let tab2 = ss.duplicateTab(window, tab);
+
+  // Wait until the tab has fully restored.
+  yield promiseTabRestored(tab2);
+  yield TabStateFlusher.flush(tab2.linkedBrowser);
+
+  // There should be two history entries now.
+  let {entries} = JSON.parse(ss.getTabState(tab2));
+  is(entries.length, 2, "there are two shistory entries");
+
+  // Cleanup.
+  yield promiseRemoveTab(tab2);
+  yield promiseRemoveTab(tab);
+});
+
+add_task(function* test_duplicate_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);
+
+  // 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();
+    });
+  });
+
+  // Duplicate the tab.
+  let tab2 = ss.duplicateTab(window, tab);
+
+  // Before the duplication finished, remove the tab.
+  yield Promise.all([promiseRemoveTab(tab), promiseTabRestored(tab2)]);
+  yield TabStateFlusher.flush(tab2.linkedBrowser);
+
+  // There should be two history entries now.
+  let {entries} = JSON.parse(ss.getTabState(tab2));
+  is(entries.length, 2, "there are two shistory entries");
+
+  // Cleanup.
+  yield promiseRemoveTab(tab2);
+});

browser/components/sessionstore/test/head.js

@@ -25,16 +25,14 @@ registerCleanupFunction(() => {
   }
 });
 
-let tmp = {};
+const {Promise} = Cu.import("resource://gre/modules/Promise.jsm", {});
-Cu.import("resource://gre/modules/Promise.jsm", tmp);
+const {SessionStore} = Cu.import("resource:///modules/sessionstore/SessionStore.jsm", {});
-Cu.import("resource://gre/modules/Task.jsm", tmp);
+const {SessionSaver} = Cu.import("resource:///modules/sessionstore/SessionSaver.jsm", {});
-Cu.import("resource:///modules/sessionstore/SessionStore.jsm", tmp);
+const {SessionFile} = Cu.import("resource:///modules/sessionstore/SessionFile.jsm", {});
-Cu.import("resource:///modules/sessionstore/SessionSaver.jsm", tmp);
+const {TabState} = Cu.import("resource:///modules/sessionstore/TabState.jsm", {});
-Cu.import("resource:///modules/sessionstore/SessionFile.jsm", tmp);
+const {TabStateFlusher} = Cu.import("resource:///modules/sessionstore/TabStateFlusher.jsm", {});
-Cu.import("resource:///modules/sessionstore/TabState.jsm", tmp);
-let {Promise, Task, SessionStore, SessionSaver, SessionFile, TabState} = tmp;
 
-let ss = Cc["@mozilla.org/browser/sessionstore;1"].getService(Ci.nsISessionStore);
+const ss = Cc["@mozilla.org/browser/sessionstore;1"].getService(Ci.nsISessionStore);
 
 // Some tests here assume that all restored tabs are loaded without waiting for
 // the user to bring them to the foreground. We ensure this by resetting the