1 files changed, 58 insertions, 0 deletions
diff --git a/browser/components/sessionstore/test/browser_635418.js b/browser/components/sessionstore/test/browser_635418.js
new file mode 100644
index 0000000000..c932a3b9f4
--- /dev/null
+++ b/browser/components/sessionstore/test/browser_635418.js
@@ -0,0 +1,58 @@
+/* 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/. */
+
+// This tests that hiding/showing a tab, on its own, eventually triggers a
+// session store.
+
+function test() {
+  waitForExplicitFinish();
+
+  // We speed up the interval between session saves to ensure that the test
+  // runs quickly.
+  Services.prefs.setIntPref("browser.sessionstore.interval", 2000);
+
+  // Loading a tab causes a save state and this is meant to catch that event.
+  waitForSaveState(testBug635418_1);
+
+  // Assumption: Only one window is open and it has one tab open.
+  BrowserTestUtils.addTab(gBrowser, "about:mozilla");
+}
+
+function testBug635418_1() {
+  ok(!gBrowser.tabs[0].hidden, "first tab should not be hidden");
+  ok(!gBrowser.tabs[1].hidden, "second tab should not be hidden");
+
+  waitForSaveState(testBug635418_2);
+
+  // We can't hide the selected tab, so hide the new one
+  gBrowser.hideTab(gBrowser.tabs[1]);
+}
+
+function testBug635418_2() {
+  let state = JSON.parse(ss.getBrowserState());
+  ok(!state.windows[0].tabs[0].hidden, "first tab should still not be hidden");
+  ok(state.windows[0].tabs[1].hidden, "second tab should be hidden by now");
+
+  waitForSaveState(testBug635418_3);
+  gBrowser.showTab(gBrowser.tabs[1]);
+}
+
+function testBug635418_3() {
+  let state = JSON.parse(ss.getBrowserState());
+  ok(
+    !state.windows[0].tabs[0].hidden,
+    "first tab should still still not be hidden"
+  );
+  ok(!state.windows[0].tabs[1].hidden, "second tab should not be hidden again");
+
+  done();
+}
+
+function done() {
+  gBrowser.removeTab(window.gBrowser.tabs[1]);
+
+  Services.prefs.clearUserPref("browser.sessionstore.interval");
+
+  executeSoon(finish);
+}