Remove db:test:prepare as a prerequistite of test:units, test:functionals, and test:integration, but provide that functional instead at test:prepared:test_type

faster_tests.rake

namespace :test do
  %w( units functionals integration).each do |type|
    task = Rake::Task["test:#{type}"]
    task "prepared:#{type}" => task.prerequisites do
      task.execute
    end
    task.clear_prerequisites
  end
end