readline was required for the test app

[carolyncole]

I got the following error when I tried to run rake engine_cart:generate

Use `bundle show [gemname]` to see where a bundled gem is installed.
    Sorry, you can't use byebug without Readline. To solve this, you need to
    rebuild Ruby with Readline support. If using Ubuntu, try `sudo apt-get
    install libreadline-dev` and then reinstall your Ruby.
/Users/cam156/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:293:in `require': dlopen(/Users/cam156/.rbenv/versions/2.3.1/lib/ruby/2.3.0/x86_64-darwin15/readline.bundle, 9): Library not loaded: /usr/local/opt/readline/lib/libreadline.6.dylib (LoadError)
  Referenced from: /Users/cam156/.rbenv/versions/2.3.1/lib/ruby/2.3.0/x86_64-darwin15/readline.bundle
  Reason: image not found - /Users/cam156/.rbenv/versions/2.3.1/lib/ruby/2.3.0/x86_64-darwin15/readline.bundle

To get around it I had to add spec.add_development_dependency 'rb-readline' to the gemspec

[afred]

hmm.. I don't think i had this problem when setting up my local GeoConcerns app. However, I think I've run into this before with other projects, and had to use rb-readline gem. I'm guessing this installs Readline on your system when you run bundle install? And then once you do it once, you don't have to do it again?

[carolyncole]

@afred if you have installed readline on your system for another gem you would not need the update. I am not 100% sure why I ran into it here and not in sufia. What I did to get around it is only one possible way. Just installing readline-dev is another.