Rake task to execute RSpec suite for each "project" inside its own folder (RVM)

Rakefile

# By Oto Brglez - <otobrglez@gmail.com>
# 
# Problem: Sometimes you have project that is build out of many "sub-projects",
# sub-project, can be anything, gem, rails app to single page app. And then you
# want to run specs for each of this project to see if everything works. Then what?
#
# Solution: On your "root" folder create Rake task that goes and executes test suite
# for each project and summers everything into report. Well... At least thats what this is. ;)
# 
# Cheers,
# - Oto

require 'open3'

# Array that holds your project folders. In my case "kicktrace" and "zed"
components = %w{
  kicktrace zed
}

# Array that holds report
big_report = []

components.map(&:to_sym).each_with_index do |component,i|
  desc "Run tests for #{component}"

  task component do
    rvm_set = nil

    # Determine Ruby version and gemset for each project
    cmd = %[echo `cat #{component}/.ruby-version`@`cat #{component}/.ruby-gemset`]
    Open3.popen3(cmd) { |stdin, stdout, stderr, wait_thr| rvm_set = stdout.read.strip }

    # We want to know how long will the suite run
    start = DateTime.now
    
    # "cd" into project, exec rspec, and "fail fast"
    test_cmd = %[cd #{component} && rvm "#{rvm_set}" exec bundle exec rspec . --fail-fast --format=progress > /dev/null ]

    # Remember to capture response status. Status != 0 is fail
    sh(test_cmd) do |ok, res|
      status = !ok ? "Failed" : "Success"
      completed = '%.3f' % ((DateTime.now - start) * 24 * 60 * 60).to_f
      big_report.push "#{component} : #{status} in #{completed}s"
    end

    # Output repor
    if i == components.size-1
      puts "\n"
      puts big_report
    end
  end
end

# Default task goes over all components
task :default => components

Task can be executed from root folder simply...

rake

Oh, and output looks like this;

kicktrace : Success in 1.378s
zed : Failed in 1.211s
eksperiments : Success in 2.002s