mikebannister/gist:1216893

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    NOTE!!!!!!!!! Ended up in trouble going down this path. Followed Rails 3 in Action method instead
generate
rails plugin new importable --dummy-path=spec/dummy --full --mountable && cd importable

in .gitignore change references to test/dummy to spec/dummy (rails bug¿)
spec/dummy/db/*.sqlite3
spec/dummy/log/*.log
spec/dummy/tmp/

check in
git init && git add . && git commit -am"generated engine"

add to gemspec
s.add_development_dependency 'rspec-rails'
s.add_development_dependency 'capybara'
s.add_development_dependency 'launchy'
s.add_development_dependency 'spork'
s.add_development_dependency 'turn'

bundle dependencies
bundle install

generate spec_helper
rails g rspec:install

change path in spec_helper to point to dummy
require File.expand_path("../dummy/config/environment", __FILE__)

add to dummy's Rakefile
load 'rspec/rails/tasks/rspec.rake'

in the engine's Rakefile change the default task
task :default => 'app:spec'

prep database
rake app:db:migrate && rake app:db:test:prepare

check in
git add . && git commit -am"test with rspec"

if you want to keep TestUnit tests around you're done, otherwise...
in the engine's Rakefile remove these tasks
require 'rake/testtask'

Rake::TestTask.new(:test) do |t|
  t.libs << 'lib'
  t.libs << 'test'
  t.pattern = 'test/**/*_test.rb'
  t.verbose = false
end

delete test dir
rm -rf test

check in
git commit -am"removed testunit tests"