fixup! Port Buildpack author guide to NodeJS

content/docs/buildpack-author-guide/create-buildpack/build-app.md

@@ -57,7 +57,6 @@ Now the Buildpack is ready to test.
 
 Your complete `node-js-buildpack/bin/build`<!--+"{{open}}"+--> script should look like this:
 
-
 <!-- test:file=node-js-buildpack/bin/build -->
 ```bash
 #!/usr/bin/env bash

content/docs/buildpack-author-guide/create-buildpack/setup-local-environment.md

@@ -50,6 +50,7 @@ server.listen(port, hostname, () => {
 
 We also create a `package.json` file with the following contents:
 
+<!-- test:file=node-js-sample-app/package.json -->
 ```javascript
 {
   name = "example-application"