Test for destroying leveldb directory when we detect a schema downgrade

content/test/data/indexeddb/open_bad_db.js

Index: content/test/data/indexeddb/open_bad_db.js
diff --git a/content/test/data/indexeddb/open_bad_db.js b/content/test/data/indexeddb/open_bad_db.js
new file mode 100644
index 0000000000000000000000000000000000000000..2b360be03c7d2635f3ebc64c3fd63f45da4a6381
--- /dev/null
+++ b/content/test/data/indexeddb/open_bad_db.js
@@ -0,0 +1,27 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+function test() {
+  request = webkitIndexedDB.open('database-basics');
+  request.onupgradeneeded = upgradeNeeded;
+  request.onsuccess = onSuccess;
+  request.onerror = unexpectedErrorCallback;
+  request.onblocked = unexpectedBlockedCallback;
+}
+
+var gotUpgradeNeeded = false;
+function upgradeNeeded() {
+  gotUpgradeNeeded = true;
+}
+
+function onSuccess(event) {
+  db = event.target.result;
+  debug("The pre-existing leveldb has an objectStore in 'database-basics',");
+  debug("ensure that it was blown away");
+  shouldBe("db.objectStoreNames.length", "0");
+  debug("We should have gotten an upgradeneeded event because the new empty");
+  debug("database doesn't have a version.");
+  shouldBeTrue("gotUpgradeNeeded");
+  done();
+}