Testing rake tasks

bar.rake

File: lib/tasks/bar.rake
class BarOutput
  def self.banner text
    puts '*' * 60
    puts " #{text}"
    puts '*' * 60
  end

  def self.puts string
    puts string
  end
end

namespace :foo do
  desc "bake some bars"
  task bake_a_bar: :environment do
    BarOutput.banner " Step back: baking in action!"
    BarOutput.puts Bar.new.bake
    BarOutput.banner " All done. Thank you for your patience."
  end
end

bar_problematic.rake

File: lib/tasks/bar_problematic.rake

namespace :foo do
  desc "bake some bars"
  task bake_a_problematic_bar: :environment do
    puts '*' * 60
    puts ' Step back: baking in action!'
    puts '*' * 60

    puts Bar.new.bake

    puts '*' * 60
    puts ' All done. Thank you for your patience.'
    puts '*' * 60
  end
end

bar_rake_problematic_spec.rb

File: spec/tasks/bar_rake_problematic_spec.rb
require 'spec_helper'
require 'rake'

describe 'foo namespace rake task' do
  describe 'foo:bake_a_problematic_bar' do

    before do
      load File.expand_path("../../../lib/tasks/bar_problematic.rake", __FILE__)
      Rake::Task.define_task(:environment)
    end

    it "should bake a bar" do
      Bar.any_instance.should_receive :bake
      Rake::Task["foo:bake_a_problematic_bar"].invoke
    end

    it "should bake a bar again" do
      Bar.any_instance.should_receive :bake
      Rake::Task["foo:bake_a_problematic_bar"].invoke
    end
  end
end

bar_rake_spec.rb

File: spec/tasks/bar_rake_spec.rb
require 'spec_helper'
require 'rake'

describe 'foo namespace rake task' do
  before :all do
    Rake.application.rake_require "tasks/bar"
    Rake::Task.define_task(:environment)
  end

  describe 'foo:bar' do
    before do
      BarOutput.stub(:banner)
      BarOutput.stub(:puts)
    end

    let :run_rake_task do
      Rake::Task["foo:bake_a_bar"].reenable
      Rake.application.invoke_task "foo:bake_a_bar"
    end

    it "should bake a bar" do
      Bar.any_instance.should_receive :bake
      run_rake_task
    end

    it "should bake a bar again" do
      Bar.any_instance.should_receive :bake
      run_rake_task
    end

    it "should output two banners" do
      BarOutput.should_receive(:banner).twice
      run_rake_task
    end

  end
end