Test Rake task

rake_task_spec.rb

require 'spec_helper'

describe "Rake tasks" do
  def fake_rake_application
    app = Rake::Application.new
    Rake.application = app
    Rake::Task.define_task('environment'){}

    app
  end

  before(:all) do
    @rake = fake_rake_application
    tasks = Dir[Rails.root.join('lib', 'tasks', '**', '*')]
    tasks.each{|t| load t }
  end

  after(:all) do
    Rake.application = nil
  end

  context "the backup task" do
    it "runs when :cron is run" do
      HerokuBackupTask.should_receive(:execute).once
      @rake['cron'].invoke
    end
  end
end