gistfile1.rb

SPEC_SUITES = [
  { :id => :acl, :title => 'access control', :files => %w(spec/controllers/**/acl_spec.rb) },
  { :id => :amazon, :title => 'Amazon libraries', :dirs => %w(spec/lib/amazon) }
]

namespace :spec do
  namespace :suite do
    SPEC_SUITES.each do |suite|
      desc "Run all specs in #{suite[:title]} spec suite"
      Spec::Rake::SpecTask.new(suite[:id]) do |t|
        spec_files = []
        if suite[:files]
          suite[:files].each { |glob| spec_files += Dir[glob] }
        end

        if suite[:dirs]
          suite[:dirs].each { |glob| spec_files += Dir["#{glob}/**/*_spec.rb"] }
        end

        t.spec_opts = ['--options', "\"#{Rails.root}/spec/spec.opts\""]
        t.spec_files = spec_files
      end
    end
  end
end

gistfile2.sh

~/test$ rake -T spec:suite

(in /Users/kpumuk/test)
rake spec:suite:acl     # Run all specs in access control spec suite
rake spec:suite:amazon  # Run all specs in Amazon libraries spec suite

gistfile3.rb

# Grab recently touched specs
def recent_specs(touched_since)
  recent_specs = Dir['app/**/*'].map do |path|
    if File.mtime(path) > touched_since
      spec = File.join('spec', File.dirname(path).split("/")[1..-1].join('/'),
      "#{File.basename(path, ".*")}_spec.rb")
      spec if File.exists?(spec)
    end
  end.compact

  recent_specs += Dir['spec/**/*_spec.rb'].select do |path|
    File.mtime(path) > touched_since
  end.uniq
end

namespace :spec do
  desc 'Run all recent specs in spec directory touched in last 10 minutes'
  Spec::Rake::SpecTask.new(:recent) do |t|
    t.spec_opts = ['--options', "\"#{RAILS_ROOT}/spec/spec.opts\""]
    t.spec_files = recent_specs(Time.now - 10.minutes)
  end
end

gistfile4.rb

# figure out where we are being loaded from
if $LOADED_FEATURES.grep(/spec\/spec_helper\.rb/).any?
  begin
    raise "foo"
  rescue => e
    puts <<-MSG
  ===================================================
  It looks like spec_helper.rb has been loaded
  multiple times. Normalize the require to:

    require "spec/spec_helper"

  Things like File.join and File.expand_path will
  cause it to be loaded multiple times.

  Loaded this time from:

    #{e.backtrace.join("\n    ")}
  ===================================================
    MSG
  end
end