diff -r 000000000000 -r 6474c204b198 toolkit/components/places/tests/migration/head_migration.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/components/places/tests/migration/head_migration.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,40 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+const Ci = Components.interfaces;
+const Cc = Components.classes;
+const Cr = Components.results;
+const Cu = Components.utils;
+
+Cu.import("resource://gre/modules/Services.jsm");
+
+// Import common head.
+let (commonFile = do_get_file("../head_common.js", false)) {
+  let uri = Services.io.newFileURI(commonFile);
+  Services.scriptloader.loadSubScript(uri.spec, this);
+}
+
+// Put any other stuff relative to this test folder below.
+
+const kDBName = "places.sqlite";
+
+/**
+ * Sets the database to use for the given test.  This should be the very first
+ * thing we do otherwise, this database will not be used!
+ *
+ * @param aFileName
+ *        The filename of the database to use.  This database must exist in
+ *        toolkit/components/places/tests/migration!
+ */
+function setPlacesDatabase(aFileName)
+{
+  let file = do_get_file(aFileName);
+
+  // Ensure that our database doesn't already exist.
+  let (dbFile = gProfD.clone()) {
+    dbFile.append(kDBName);
+    do_check_false(dbFile.exists());
+  }
+
+  file.copyToFollowingLinks(gProfD, kDBName);
+}