diff -r 000000000000 -r 6474c204b198 toolkit/components/places/tests/unit/test_utils_backups_create.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/components/places/tests/unit/test_utils_backups_create.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,91 @@
+/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et: */
+/* 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/. */
+
+ /**
+  * Check for correct functionality of bookmarks backups
+  */
+
+const NUMBER_OF_BACKUPS = 10;
+
+function run_test() {
+  run_next_test();
+}
+
+add_task(function () {
+  // Generate random dates.
+  let dateObj = new Date();
+  let dates = [];
+  while (dates.length < NUMBER_OF_BACKUPS) {
+    // Use last year to ensure today's backup is the newest.
+    let randomDate = new Date(dateObj.getFullYear() - 1,
+                              Math.floor(12 * Math.random()),
+                              Math.floor(28 * Math.random()));
+    let dateString = randomDate.toLocaleFormat("%Y-%m-%d");
+    if (dates.indexOf(dateString) == -1)
+      dates.push(dateString);
+  }
+  // Sort dates from oldest to newest.
+  dates.sort();
+
+  // Get and cleanup the backups folder.
+  let backupFolderPath = yield PlacesBackups.getBackupFolder();
+  let bookmarksBackupDir = new FileUtils.File(backupFolderPath);
+
+  // Fake backups are created backwards to ensure we won't consider file
+  // creation time.
+  // Create fake backups for the newest dates.
+  for (let i = dates.length - 1; i >= 0; i--) {
+    let backupFilename = PlacesBackups.getFilenameForDate(new Date(dates[i]));
+    let backupFile = bookmarksBackupDir.clone();
+    backupFile.append(backupFilename);
+    backupFile.create(Ci.nsIFile.NORMAL_FILE_TYPE, parseInt("0666", 8));
+    do_log_info("Creating fake backup " + backupFile.leafName);
+    if (!backupFile.exists())
+      do_throw("Unable to create fake backup " + backupFile.leafName);
+  }
+
+  yield PlacesBackups.create(NUMBER_OF_BACKUPS);
+  // Add today's backup.
+  dates.push(dateObj.toLocaleFormat("%Y-%m-%d"));
+
+  // Check backups.  We have 11 dates but we the max number is 10 so the
+  // oldest backup should have been removed.
+  for (let i = 0; i < dates.length; i++) {
+    let backupFilename;
+    let shouldExist;
+    let backupFile;
+    if (i > 0) {
+      let files = bookmarksBackupDir.directoryEntries;
+      while (files.hasMoreElements()) {
+        let entry = files.getNext().QueryInterface(Ci.nsIFile);
+        if (PlacesBackups.filenamesRegex.test(entry.leafName)) {
+          backupFilename = entry.leafName;
+          backupFile = entry;
+          break;
+        }
+      }
+      shouldExist = true;
+    }
+    else {
+      backupFilename = PlacesBackups.getFilenameForDate(new Date(dates[i]));
+      backupFile = bookmarksBackupDir.clone();
+      backupFile.append(backupFilename);
+      shouldExist = false;
+    }
+    if (backupFile.exists() != shouldExist)
+      do_throw("Backup should " + (shouldExist ? "" : "not") + " exist: " + backupFilename);
+  }
+
+  // Cleanup backups folder.
+  // XXX: Can't use bookmarksBackupDir.remove(true) because file lock happens
+  // on WIN XP.
+  let files = bookmarksBackupDir.directoryEntries;
+  while (files.hasMoreElements()) {
+    let entry = files.getNext().QueryInterface(Ci.nsIFile);
+    entry.remove(false);
+  }
+  do_check_false(bookmarksBackupDir.directoryEntries.hasMoreElements());
+});