Index: test/all.js
===================================================================
--- a/test/all.js
+++ b/test/all.js
@@ -29,8 +29,8 @@
   if (spec)
   {
     if (spec == "installed")
-      return Promise.resolve("");
-    if (spec.startswith("path:"))
+      return Promise.resolve(null);
+    if (spec.startsWith("path:"))
       return Promise.resolve(spec.substr(5));
     if (spec.startsWith("download:"))
       version = spec.substr(9);