diff -r 000000000000 -r 6474c204b198 toolkit/mozapps/update/tests/unit_aus_update/cleanupSuccessLogsFIFO.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/mozapps/update/tests/unit_aus_update/cleanupSuccessLogsFIFO.js	Wed Dec 31 06:09:35 2014 +0100
@@ -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/.
+ */
+
+function run_test() {
+  setupTestCommon();
+
+  logTestInfo("testing update logs are first in first out deleted");
+
+  writeUpdatesToXMLFile(getLocalUpdatesXMLString(""), false);
+  var patches = getLocalPatchString(null, null, null, null, null, null,
+                                    STATE_PENDING);
+  var updates = getLocalUpdateString(patches);
+  writeUpdatesToXMLFile(getLocalUpdatesXMLString(updates), true);
+  writeStatusFile(STATE_SUCCEEDED);
+
+  var dir = getUpdatesDir();
+  var log = dir.clone();
+  log.append(FILE_LAST_LOG);
+  writeFile(log, "Backup Update Log");
+
+  log = dir.clone();
+  log.append(FILE_BACKUP_LOG);
+  writeFile(log, "To Be Deleted Backup Update Log");
+
+  log = dir.clone();
+  log.append("0");
+  log.append(FILE_UPDATE_LOG);
+  writeFile(log, "Last Update Log");
+
+  standardInit();
+
+  logTestInfo("testing " + log.path + " shouldn't exist");
+  do_check_false(log.exists());
+
+  log = dir.clone();
+  log.append(FILE_LAST_LOG);
+  logTestInfo("testing " + log.path + " should exist");
+  do_check_true(log.exists());
+
+  logTestInfo("testing " + log.path + " contents");
+  do_check_eq(readFile(log), "Last Update Log");
+
+  log = dir.clone();
+  log.append(FILE_BACKUP_LOG);
+  logTestInfo("testing " + log.path + " should exist");
+  do_check_true(log.exists());
+
+  logTestInfo("testing " + log.path + " contents (bug 470979)");
+  do_check_eq(readFile(log), "Backup Update Log");
+
+  dir.append("0");
+  logTestInfo("testing " + dir.path + " should exist (bug 512994)");
+  do_check_true(dir.exists());
+
+  doTestFinish();
+}