1 files changed, 54 insertions, 0 deletions
diff --git a/browser/components/sessionstore/test/browser_586068-cascade.js b/browser/components/sessionstore/test/browser_586068-cascade.js
new file mode 100644
index 000000000..041aea85c
--- /dev/null
+++ b/browser/components/sessionstore/test/browser_586068-cascade.js
@@ -0,0 +1,54 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+const PREF_RESTORE_ON_DEMAND = "browser.sessionstore.restore_on_demand";
+
+add_task(function* test() {
+  Services.prefs.setBoolPref(PREF_RESTORE_ON_DEMAND, false);
+  registerCleanupFunction(function () {
+    Services.prefs.clearUserPref(PREF_RESTORE_ON_DEMAND);
+  });
+
+  let state = { windows: [{ tabs: [
+    { entries: [{ url: "http://example.com" }], extData: { "uniq": r() } },
+    { entries: [{ url: "http://example.com" }], extData: { "uniq": r() } },
+    { entries: [{ url: "http://example.com" }], extData: { "uniq": r() } },
+    { entries: [{ url: "http://example.com" }], extData: { "uniq": r() } },
+    { entries: [{ url: "http://example.com" }], extData: { "uniq": r() } },
+    { entries: [{ url: "http://example.com" }], extData: { "uniq": r() } }
+  ] }] };
+
+  let expectedCounts = [
+    [3, 3, 0],
+    [2, 3, 1],
+    [1, 3, 2],
+    [0, 3, 3],
+    [0, 2, 4],
+    [0, 1, 5]
+  ];
+
+  let loadCount = 0;
+  let promiseRestoringTabs = new Promise(resolve => {
+    gProgressListener.setCallback(function (aBrowser, aNeedRestore, aRestoring, aRestored) {
+      loadCount++;
+      let expected = expectedCounts[loadCount - 1];
+
+      is(aNeedRestore, expected[0], "load " + loadCount + " - # tabs that need to be restored");
+      is(aRestoring, expected[1], "load " + loadCount + " - # tabs that are restoring");
+      is(aRestored, expected[2], "load " + loadCount + " - # tabs that has been restored");
+
+      if (loadCount == state.windows[0].tabs.length) {
+        gProgressListener.unsetCallback();
+        resolve();
+      }
+    });
+  });
+
+  let backupState = ss.getBrowserState();
+  ss.setBrowserState(JSON.stringify(state));
+  yield promiseRestoringTabs;
+
+  // Cleanup.
+  yield promiseBrowserState(backupState);
+});