rails--rails/railties/test/generators/assets_generator_test.rb

require 'generators/generators_test_helper'
require 'rails/generators/rails/assets/assets_generator'

class AssetsGeneratorTest < Rails::Generators::TestCase
  include GeneratorsTestHelper
  arguments %w(posts)

  def test_assets
    run_generator
    assert_file "app/assets/javascripts/posts.js"
    assert_file "app/assets/stylesheets/posts.css"
  end

  def test_skipping_assets
    run_generator ["posts", "--no-stylesheets", "--no-javascripts"]
    assert_no_file "app/assets/javascripts/posts.js"
    assert_no_file "app/assets/stylesheets/posts.css"
  end
end