import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

browser/components/sessionstore/test/browser_526613.js

@@ -0,0 +1,72 @@
+/* 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/. */
+
+function test() {
+  /** Test for Bug 526613 **/
+
+  // test setup
+  waitForExplicitFinish();
+
+  function browserWindowsCount(expected) {
+    let count = 0;
+    let e = Services.wm.getEnumerator("navigator:browser");
+    while (e.hasMoreElements()) {
+      if (!e.getNext().closed)
+        ++count;
+    }
+    is(count, expected,
+       "number of open browser windows according to nsIWindowMediator");
+    let state = ss.getBrowserState();
+    info(state);
+    is(JSON.parse(state).windows.length, expected,
+       "number of open browser windows according to getBrowserState");
+  }
+
+  browserWindowsCount(1);
+
+  // backup old state
+  let oldState = ss.getBrowserState();
+  // create a new state for testing
+  let testState = {
+    windows: [
+      { tabs: [{ entries: [{ url: "http://example.com/" }] }], selected: 1 },
+      { tabs: [{ entries: [{ url: "about:mozilla"       }] }], selected: 1 },
+    ],
+    // make sure the first window is focused, otherwise when restoring the
+    // old state, the first window is closed and the test harness gets unloaded
+    selectedWindow: 1
+  };
+
+  let pass = 1;
+  function observer(aSubject, aTopic, aData) {
+    is(aTopic, "sessionstore-browser-state-restored",
+       "The sessionstore-browser-state-restored notification was observed");
+
+    if (pass++ == 1) {
+      browserWindowsCount(2);
+
+      // let the first window be focused (see above)
+      function pollMostRecentWindow() {
+        if (Services.wm.getMostRecentWindow("navigator:browser") == window) {
+          ss.setBrowserState(oldState);
+        } else {
+          info("waiting for the current window to become active");
+          setTimeout(pollMostRecentWindow, 0);
+          window.focus(); //XXX Why is this needed?
+        }
+      }
+      pollMostRecentWindow();
+    }
+    else {
+      browserWindowsCount(1);
+      ok(!window.closed, "Restoring the old state should have left this window open");
+      Services.obs.removeObserver(observer, "sessionstore-browser-state-restored");
+      finish();
+    }
+  }
+  Services.obs.addObserver(observer, "sessionstore-browser-state-restored", false);
+
+  // set browser to test state
+  ss.setBrowserState(JSON.stringify(testState));
+}