rails--rails/actionpack/test/controller/render_js_test.rb

require 'abstract_unit'
require 'controller/fake_models'
require 'pathname'

class RenderJSTest < ActionController::TestCase
  class TestController < ActionController::Base
    protect_from_forgery

    def self.controller_path
      'test'
    end

    def render_vanilla_js_hello
      render :js => "alert('hello')"
    end

    def show_partial
      render :partial => 'partial'
    end
  end

  tests TestController

  def test_render_vanilla_js
    xhr :get, :render_vanilla_js_hello
    assert_equal "alert('hello')", @response.body
    assert_equal "text/javascript", @response.content_type
  end

  def test_should_render_js_partial
    xhr :get, :show_partial, :format => 'js'
    assert_equal 'partial js', @response.body
  end
end