1 files changed, 120 insertions, 0 deletions
diff --git a/browser/components/sessionstore/test/browser_586068-window_state.js b/browser/components/sessionstore/test/browser_586068-window_state.js
new file mode 100644
index 0000000000..69c3742a66
--- /dev/null
+++ b/browser/components/sessionstore/test/browser_586068-window_state.js
@@ -0,0 +1,120 @@
+/* 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(async function test() {
+  Services.prefs.setBoolPref(PREF_RESTORE_ON_DEMAND, false);
+  registerCleanupFunction(function () {
+    Services.prefs.clearUserPref(PREF_RESTORE_ON_DEMAND);
+  });
+
+  // We'll use 2 states so that we can make sure calling setWindowState doesn't
+  // wipe out currently restoring data.
+  let state1 = {
+    windows: [
+      {
+        tabs: [
+          {
+            entries: [
+              { url: "http://example.com#1", triggeringPrincipal_base64 },
+            ],
+          },
+          {
+            entries: [
+              { url: "http://example.com#2", triggeringPrincipal_base64 },
+            ],
+          },
+          {
+            entries: [
+              { url: "http://example.com#3", triggeringPrincipal_base64 },
+            ],
+          },
+          {
+            entries: [
+              { url: "http://example.com#4", triggeringPrincipal_base64 },
+            ],
+          },
+          {
+            entries: [
+              { url: "http://example.com#5", triggeringPrincipal_base64 },
+            ],
+          },
+        ],
+      },
+    ],
+  };
+  let state2 = {
+    windows: [
+      {
+        tabs: [
+          {
+            entries: [
+              { url: "http://example.org#1", triggeringPrincipal_base64 },
+            ],
+          },
+          {
+            entries: [
+              { url: "http://example.org#2", triggeringPrincipal_base64 },
+            ],
+          },
+          {
+            entries: [
+              { url: "http://example.org#3", triggeringPrincipal_base64 },
+            ],
+          },
+          {
+            entries: [
+              { url: "http://example.org#4", triggeringPrincipal_base64 },
+            ],
+          },
+          {
+            entries: [
+              { url: "http://example.org#5", triggeringPrincipal_base64 },
+            ],
+          },
+        ],
+      },
+    ],
+  };
+  let numTabs = state1.windows[0].tabs.length + state2.windows[0].tabs.length;
+
+  let loadCount = 0;
+  let promiseRestoringTabs = new Promise(resolve => {
+    gProgressListener.setCallback(function (
+      aBrowser,
+      aNeedRestore,
+      aRestoring,
+      aRestored
+    ) {
+      // When loadCount == 2, we'll also restore state2 into the window
+      if (++loadCount == 2) {
+        ss.setWindowState(window, JSON.stringify(state2), false);
+      }
+
+      if (loadCount < numTabs) {
+        return;
+      }
+
+      // We don't actually care about load order in this test, just that they all
+      // do load.
+      is(
+        loadCount,
+        numTabs,
+        "test_setWindowStateNoOverwrite: all tabs were restored"
+      );
+      is(aNeedRestore, 0, "there are no tabs left needing restore");
+
+      gProgressListener.unsetCallback();
+      resolve();
+    });
+  });
+
+  let backupState = ss.getBrowserState();
+  ss.setWindowState(window, JSON.stringify(state1), true);
+  await promiseRestoringTabs;
+
+  // Cleanup.
+  await promiseBrowserState(backupState);
+});