test db prepare for merb

gistfile1.rbx

namespace :db do
  namespace :test do
    desc "Create the test DB and do migrations automatonlly"
    task :prepare do
      Merb.start_environment(:environment => 'test', :adapter => 'runner')
      config = Merb::Orms::DataMapper.config
      puts "Creating database '#{config[:database]}'"
      case config[:adapter]
      when 'postgres'
        `createdb -U #{config[:username]} #{config[:database]}`
      when 'mysql'
        `mysqladmin -u #{config[:username]} #{config[:password] ? "-p'#{config[:password]}'" : ''} create #{config[:database]}`
      when 'sqlite3'
        Rake::Task['rake:db:automigrate'].invoke
      else
        raise "Adapter #{config[:adapter]} not supported for creating databases yet."
      end
      ::DataMapper::AutoMigrator.auto_migrate
    end
  end
end