tests: ensure mocha suite separation

Author: dougwilson

package.json

@@ -30,6 +30,6 @@
     "npm": "1.2.8000 || >= 1.4.16"
   },
   "scripts": {
-    "test": "istanbul cover node_modules/mocha/bin/_mocha"
+    "test": "istanbul cover node_modules/mocha/bin/_mocha -- test/*/index.js"
   }
 }