Implement flexible fake backend

Change-Id: Icff0d3b8e1a82c7e459dfac6417f59502f0eb099
diff --git a/t/remote.t b/t/remote.t
index 78539d7..328b4ef 100644
--- a/t/remote.t
+++ b/t/remote.t
@@ -15,7 +15,7 @@
 my $fake_backend = $t->app->plugin(
   Mount => {
     $mount_point =>
-      $fixtures_path->child('query_backend.pl')
+      $fixtures_path->child('fake_backend.pl')
   }
 );