test_coverage.rake

# based off of http://eigenclass.org/hiki.rb?rcov+FAQ#l3

require 'rcov/rcovtask'

namespace :test do 
  namespace :coverage do
    desc "Delete aggregate coverage data."
    task(:clean) { rm_f "test/coverage/coverage.data" }

    %w[units functionals integration].each do |target|
      Rcov::RcovTask.new(target) do |t|
        t.libs << "test"
        t.test_files = FileList["test/#{target.sub(/s\Z/, '')}/**/*_test.rb"]
        t.output_dir = "test/coverage/#{target}"
        t.verbose = true
        t.rcov_opts << '--rails --exclude "\\w*_test_helper.rb" --exclude "/Library/*" --aggregate test/coverage/coverage.data'
      end
      task target => 'test:coverage:clean'
    end

    Rcov::RcovTask.new('report') do |t|
      t.test_files = FileList["lib/noop.rb"]
      t.output_dir = "test/coverage/report"
      t.verbose = true
      t.rcov_opts = ['--rails --exclude "\\w*_test_helper.rb" --exclude "/Library/*" --text-summary --html --aggregate test/coverage/coverage.data']
    end
    Rake::Task['test:coverage:report'].comment = 'Create report from existing coverage data'
    Rake::Task['test:coverage:clobber_report'].comment = 'Remove rcov products for aggregate report'
  end

  desc 'Aggregate code coverage for unit, functional and integration tests'
  task :coverage => 'test:coverage:clean' do
    old_rcov_opts = ENV['RCOVOPTS']
    ENV['RCOVOPTS'] = '--rails --no-html --exclude "\\w*_test_helper.rb" --exclude "/Library/*" --text-summary --aggregate test/coverage/coverage.data'
    got_error = false
    Rake::Task["test:coverage:units"].invoke       rescue got_error = true
    Rake::Task["test:coverage:functionals"].invoke rescue got_error = true
    Rake::Task["test:coverage:integration"].invoke rescue got_error = true

    ENV['RCOVOPTS'] = old_rcov_opts
    Rake::Task["test:coverage:report"].invoke
    if PLATFORM['darwin']
      system('open test/coverage/report/index.html')
    else
      puts 'open test/coverage/report/index.html in your web browser to view the results'
    end

    raise "Test failures" if got_error
  end
end