1 files changed, 137 insertions, 0 deletions
diff --git a/browser/components/sessionstore/test/browser_461634.js b/browser/components/sessionstore/test/browser_461634.js
new file mode 100644
index 0000000000..5de6b92c33
--- /dev/null
+++ b/browser/components/sessionstore/test/browser_461634.js
@@ -0,0 +1,137 @@
+/* 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 { SessionStore } = ChromeUtils.importESModule(
+  "resource:///modules/sessionstore/SessionStore.sys.mjs"
+);
+
+add_task(async function testClosedTabData() {
+  /** Test for Bug 461634 **/
+
+  const REMEMBER = Date.now(),
+    FORGET = Math.random();
+  let test_state = {
+    windows: [
+      {
+        tabs: [{ entries: [] }],
+        _closedTabs: [
+          {
+            state: { entries: [{ url: "http://www.example.net/" }] },
+            title: FORGET,
+          },
+          {
+            state: { entries: [{ url: "http://www.example.net/" }] },
+            title: REMEMBER,
+          },
+          {
+            state: { entries: [{ url: "http://www.example.net/" }] },
+            title: FORGET,
+          },
+          {
+            state: { entries: [{ url: "http://www.example.net/" }] },
+            title: REMEMBER,
+          },
+        ],
+      },
+    ],
+  };
+  let remember_count = 2;
+
+  function countByTitle(aClosedTabList, aTitle) {
+    return aClosedTabList.filter(aData => aData.title == aTitle).length;
+  }
+
+  function testForError(aFunction) {
+    try {
+      aFunction();
+      return false;
+    } catch (ex) {
+      return ex.name == "NS_ERROR_ILLEGAL_VALUE";
+    }
+  }
+
+  // Open a window and add the above closed tab list.
+  let newWin = openDialog(location, "", "chrome,all,dialog=no");
+  await promiseWindowLoaded(newWin);
+
+  Services.prefs.setIntPref(
+    "browser.sessionstore.max_tabs_undo",
+    test_state.windows[0]._closedTabs.length
+  );
+  await setWindowState(newWin, test_state);
+
+  let closedTabs = SessionStore.getClosedTabData(newWin);
+
+  // Verify that non JSON serialized data is the same as JSON serialized data.
+  is(
+    JSON.stringify(closedTabs),
+    JSON.stringify(SessionStore.getClosedTabData(newWin)),
+    "Non-serialized data is the same as serialized data"
+  );
+
+  is(
+    closedTabs.length,
+    test_state.windows[0]._closedTabs.length,
+    "Closed tab list has the expected length"
+  );
+  is(
+    countByTitle(closedTabs, FORGET),
+    test_state.windows[0]._closedTabs.length - remember_count,
+    "The correct amout of tabs are to be forgotten"
+  );
+  is(
+    countByTitle(closedTabs, REMEMBER),
+    remember_count,
+    "Everything is set up"
+  );
+
+  // All of the following calls with illegal arguments should throw NS_ERROR_ILLEGAL_VALUE.
+  ok(
+    testForError(() => ss.forgetClosedTab({}, 0)),
+    "Invalid window for forgetClosedTab throws"
+  );
+  ok(
+    testForError(() => ss.forgetClosedTab(newWin, -1)),
+    "Invalid tab for forgetClosedTab throws"
+  );
+  ok(
+    testForError(() =>
+      ss.forgetClosedTab(newWin, test_state.windows[0]._closedTabs.length + 1)
+    ),
+    "Invalid tab for forgetClosedTab throws"
+  );
+
+  // Remove third tab, then first tab.
+  ss.forgetClosedTab(newWin, 2);
+  ss.forgetClosedTab(newWin, null);
+
+  closedTabs = SessionStore.getClosedTabData(newWin);
+
+  // Verify that non JSON serialized data is the same as JSON serialized data.
+  is(
+    JSON.stringify(closedTabs),
+    JSON.stringify(SessionStore.getClosedTabData(newWin)),
+    "Non-serialized data is the same as serialized data"
+  );
+
+  is(
+    closedTabs.length,
+    remember_count,
+    "The correct amout of tabs was removed"
+  );
+  is(
+    countByTitle(closedTabs, FORGET),
+    0,
+    "All tabs specifically forgotten were indeed removed"
+  );
+  is(
+    countByTitle(closedTabs, REMEMBER),
+    remember_count,
+    "... and tabs not specifically forgetten weren't"
+  );
+
+  // Clean up.
+  Services.prefs.clearUserPref("browser.sessionstore.max_tabs_undo");
+  await BrowserTestUtils.closeWindow(newWin);
+});