Example Capistrano configuration to run RSpec tests on build instance

build.rb

role :app, 'your-build-server-ip'

set :scm, :git
set :repository, "your-git-repo-url"

set :user, 'your-user-name'
set :deploy_to, "/Users/#{user}/deployments/build/#{application}"
set :deploy_via, :export
set :branch, 'master'
set :rails_env, 'build'

namespace :deploy do

  desc "Make sure all specs pass"
  task :check_specs do
    begin
      puts "Updating dependencies..."
      run "cd #{release_path} && bundle install"
      puts "Generating test database..."
      run "cd #{release_path} && rake db:setup RAILS_ENV=test"
      puts "Checking specs..."
      system("cd #{release_path} && bundle exec rspec .") or raise "One or more specs are failing. Come back when they all pass."
      @failed = false
    rescue Exception => e
      puts e
      @failed = true
    end
    abort if @failed
  end

end

before 'deploy:assets:symlink',  'deploy:check_specs'