issue setting up test environment on Grape REST API tutorial

i signed up for the “Build REST APIs with Grape” on tutsplus,

I am having an issue getting the test suite up and running.
whenever I run !rake or !rake test i get an error message:

rake spree_auth:admin:create test --trace
rake aborted!
LoadError: cannot load such file – rack-test

for kicks i pushed up my erroring code to github if anyone wants to take a look at it, I would post a snapshot of my code but it spans over several files in length.

Hi @aronlmin, thanks for posting that repo.

Sorry if this is a dumb question, but did you install and run bundler with gem install bundler and bundle install?