HapiJS Custom plugin error

hapi_plugin.js

// File: real-plugin-src.js
module.exports = ( plugin, options, next ) => {
    // Do stuff...

    next()
}

module.exports.attributes = {
    pkg: {
        name: "test-plugin",
        version: "1.0.0"
    }
}

// File: ./test-plugin.js
module.exports = require('./real-plugin-src')

// File: ./app.js
const internals = {
    manifest: {
        connections: [{
            port: 8000,
            labels: ['api']
        }],
        registrations: [{
            plugin: {
                register: 'blipp',
                options: {
                    showStart: true
                }
            }
        }, {
            plugin: {
                register: './test-plugin',
                options: {
                    rootResource: 'root',
                    routeDir: './dist/routes2'
                }
            }
        }]
    }
}

Glue.compose( internals.manifest, { relativeTo: __dirname }, ( err, server ) => {
    if( err )
        return console.error('# ERROR:', err )
    server.start( () => console.log( '# Server Started: ', server.info.uri ))
})

/*
Error: Invalid plugin options {
  "options": {
    "rootResource": "root",
    "routeDir": "./dist/routes2"
  },
  "register" [1]: {}
}

[1] "register" must be a Function
*/