This is what you should put in the Rakefile for your gem to build in a test Rails app

Rakefile_mods

namespace "testbed" do

  RAPPNAME = "test_app" #This is also hardcoded in the spec/spec_helper.rb and gitignore file. Change it there too...

  desc "Install rails base app in spec dir"
  task :build_app do
    directory "spec"
    chdir("spec") do
      sh "rails #{RAPPNAME}"
      puts "Put a test_app in the spec folder"
      chdir("#{RAPPNAME}") do
        sh "ruby script/generate rspec"
        puts "Ran plugin installer for rspec in #{RAPPNAME}"
      end
    end
  end
 
  desc "Copy in setup files to test app"
  task :copy_files do
    chdir("spec/#{RAPPNAME}") do
      sh "cp ../test_Gemfile Gemfile"
      sh "cp ../test_preinitializer.rb config/preinitializer.rb"
      sh "cp ../test_boot.rb config/boot.rb"
      puts "NOTE: These files were created/modified as described here: http://gembundler.com/rails23.html"
    end
  end

#  You'll want to install your dev gem into the app but not quite yet
  desc "Install gem plugin in rails base app, runs migrations, preps for testing"
  task :install_gem_plugin do
#    sh "gem install bclog"
#    chdir("spec/#{RAPPNAME}") do
#      sh "bundle install"
#      sh "bundle exec script/generate bclog"
#      sh "rake db:migrate"
#      sh "rake db:test:prepare"
#    end
#    puts "NOTE: Run `gem uninstall bclog` to remove the gem version of surveyor leaving the dev version" # Getting around a bug/problem in bundler. see: http://bit.ly/9NZOEz
  end

  desc "Remove rails base app in spec dir"
  task :remove_app do
    puts "Removing the test_app in the spec folder"
    sh "rm -rf spec/#{RAPPNAME}"
  end

  desc "Setup for the test app (create)"
  task :setup => [:build_app, :copy_files, :install_gem_plugin]
  desc "Teardown for the test app (remove)"
  task :teardown => [:remove_app]

end # namespace