We can't use dummy app for tests

[kiwiupover]

TypeError: Cannot read property 'outputPath' of undefined
    at app.use (/Users/davidlaird/projects/ember-cli-fastboot/index.js:313:42)

The ember-cli-fastboot addon needs to come before broccoli-serve-files to SSR files.

Running the dummy app will result in the following error

TypeError: Cannot read property 'outputPath' of undefined
    at app.use (/Users/davidlaird/projects/ember-cli-fastboot/index.js:313:42)

https://github.com/ember-fastboot/ember-cli-fastboot/blob/master/index.js#L325

The list of addons (truncated) when running the dummy app.

[ 'testem-url-rewriter',
  'ember-cli-fastboot',
  'tests-server-middleware',
  'history-support-middleware',
  'live-reload-middleware',
  'broccoli-watcher',
  'broccoli-serve-files',
  'proxy-server-middleware',
    ...
  'ember-cli-babel' ]

This an app list of addons (truncated) with Fastboot SSR it's files.

[ 'amd-transform',
  'tests-server-middleware',
  'history-support-middleware',
  'live-reload-middleware',
  'broccoli-watcher',
  'ember-cli-fastboot',
  'broccoli-serve-files',
  'proxy-server-middleware',
     ...
  'ember-source',
  'ember-welcome-page',
  'qunit-dom' ]