npm-run-all --parallel start:server web:preview

package.json

@@ -32,7 +32,7 @@
     "test:acceptance": "node test/acceptance/index.js",
     "test:unit": "node test/unit/index.js | tap-spec",
     "test": "npm run lint && npm run test:unit",
-    "test:serve": "npm-run-all --parallel  web:serve start:server",
+    "test:serve": "npm-run-all --parallel start:server web:preview",
     "test:next-update": "next-update",
     "travis:deletecache": "travis cache --delete",
     "watch:css": "nodemon --watch src --ext scss -x 'npm run build:css'",