plugin_loader_test.rb

require 'plugin_test_helper'

$:.unshift File.dirname(__FILE__) + "/../../actionpack/lib"
require 'action_controller'

# Mocks out the configuration
module Rails
  def self.configuration
    Rails::Configuration.new
  end
end

class TestPluginLoader < Test::Unit::TestCase
  ORIGINAL_LOAD_PATH = $LOAD_PATH.dup

  def setup
    reset_load_path!

    @configuration     = Rails::Configuration.new
    @configuration.plugin_paths << plugin_fixture_root_path
    @initializer       = Rails::Initializer.new(@configuration)
    @valid_plugin_path = plugin_fixture_path('default/stubby')
    @empty_plugin_path = plugin_fixture_path('default/empty')

    @failure_tip = "It's likely someone has added a new plugin fixture without updating this list"

    @loader = Rails::Plugin::Loader.new(@initializer)
  end

  def test_should_locate_plugins_by_asking_each_locator_specifed_in_configuration_for_its_plugins_result
    locator_1 = stub(:plugins => [:a, :b, :c])
    locator_2 = stub(:plugins => [:d, :e, :f])
    locator_class_1 = stub(:new => locator_1)
    locator_class_2 = stub(:new => locator_2)
    @configuration.plugin_locators = [locator_class_1, locator_class_2]
    assert_equal [:a, :b, :c, :d, :e, :f], @loader.send(:locate_plugins)
  end

  def test_should_memoize_the_result_of_locate_plugins_as_all_plugins
    plugin_list = [:a, :b, :c]
    @loader.expects(:locate_plugins).once.returns(plugin_list)
    assert_equal plugin_list, @loader.all_plugins
    assert_equal plugin_list, @loader.all_plugins # ensuring that locate_plugins isn't called again
  end

  def test_should_return_empty_array_if_configuration_plugins_is_empty
    @configuration.plugins = []
    assert_equal [], @loader.plugins
  end

  def test_should_find_all_availble_plugins_and_return_as_all_plugins
    assert_plugins [ :engine, :stubby, :plugin_with_no_lib_dir, :gemlike, :acts_as_chunky_bacon, :a], @loader.all_plugins.reverse, @failure_tip
  end

  def test_should_return_all_plugins_as_plugins_when_registered_plugin_list_is_untouched
    assert_plugins [:a, :acts_as_chunky_bacon, :engine, :gemlike, :plugin_with_no_lib_dir, :stubby], @loader.plugins, @failure_tip
  end

  def test_should_return_all_plugins_as_plugins_when_registered_plugin_list_is_nil
    @configuration.plugins = nil
    assert_plugins [:a, :acts_as_chunky_bacon, :engine, :gemlike, :plugin_with_no_lib_dir, :stubby], @loader.plugins, @failure_tip
  end

  def test_should_return_specific_plugins_named_in_config_plugins_array_if_set
    plugin_names = [:acts_as_chunky_bacon, :stubby]
    only_load_the_following_plugins! plugin_names
    assert_plugins plugin_names, @loader.plugins
  end

  def test_should_respect_the_order_of_plugins_given_in_configuration
    plugin_names = [:stubby, :acts_as_chunky_bacon]
    only_load_the_following_plugins! plugin_names
    assert_plugins plugin_names, @loader.plugins
  end

  def test_should_load_all_plugins_in_natural_order_when_all_is_used
    only_load_the_following_plugins! [:all]
    assert_plugins [:a, :acts_as_chunky_bacon, :engine, :gemlike, :plugin_with_no_lib_dir, :stubby], @loader.plugins, @failure_tip
  end

  def test_should_load_specified_plugins_in_order_and_then_all_remaining_plugins_when_all_is_used
    only_load_the_following_plugins! [:stubby, :acts_as_chunky_bacon, :all]
    assert_plugins [:stubby, :acts_as_chunky_bacon, :a, :engine, :gemlike, :plugin_with_no_lib_dir], @loader.plugins, @failure_tip
  end

  def test_should_be_able_to_specify_loading_of_plugins_loaded_after_all
    only_load_the_following_plugins!  [:stubby, :all, :acts_as_chunky_bacon]
    assert_plugins [:stubby, :a, :engine, :gemlike, :plugin_with_no_lib_dir, :acts_as_chunky_bacon], @loader.plugins, @failure_tip
  end

  def test_should_accept_plugin_names_given_as_strings
    only_load_the_following_plugins! ['stubby', 'acts_as_chunky_bacon', :a, :plugin_with_no_lib_dir]
    assert_plugins [:stubby, :acts_as_chunky_bacon, :a, :plugin_with_no_lib_dir], @loader.plugins, @failure_tip
  end

  def test_should_add_plugin_load_paths_to_global_LOAD_PATH_array
    only_load_the_following_plugins! [:stubby, :acts_as_chunky_bacon]
    stubbed_application_lib_index_in_LOAD_PATHS = 4
    @loader.stubs(:application_lib_index).returns(stubbed_application_lib_index_in_LOAD_PATHS)

    @loader.add_plugin_load_paths

    assert $LOAD_PATH.index(File.join(plugin_fixture_path('default/stubby'), 'lib')) >= stubbed_application_lib_index_in_LOAD_PATHS
    assert $LOAD_PATH.index(File.join(plugin_fixture_path('default/acts/acts_as_chunky_bacon'), 'lib')) >= stubbed_application_lib_index_in_LOAD_PATHS
  end

  def test_should_add_plugin_load_paths_to_Dependencies_load_paths
    only_load_the_following_plugins! [:stubby, :acts_as_chunky_bacon]

    @loader.add_plugin_load_paths

    assert ActiveSupport::Dependencies.load_paths.include?(File.join(plugin_fixture_path('default/stubby'), 'lib'))
    assert ActiveSupport::Dependencies.load_paths.include?(File.join(plugin_fixture_path('default/acts/acts_as_chunky_bacon'), 'lib'))
  end

  def test_should_add_engine_load_paths_to_Dependencies_load_paths
    only_load_the_following_plugins! [:engine]

    @loader.add_plugin_load_paths

    %w( models controllers helpers ).each do |app_part|
      assert ActiveSupport::Dependencies.load_paths.include?(
        File.join(plugin_fixture_path('engines/engine'), 'app', app_part)
      ), "Couldn't find #{app_part} in load path"
    end
  end
  
  def test_engine_controllers_should_have_their_view_path_set_when_loaded
    only_load_the_following_plugins!([ :engine ])

    @loader.send :add_engine_view_paths
    
    assert_equal [ File.join(plugin_fixture_path('engines/engine'), 'app', 'views') ], ActionController::Base.view_paths
  end

  def test_should_add_plugin_load_paths_to_Dependencies_load_once_paths
    only_load_the_following_plugins! [:stubby, :acts_as_chunky_bacon]

    @loader.add_plugin_load_paths

    assert ActiveSupport::Dependencies.load_once_paths.include?(File.join(plugin_fixture_path('default/stubby'), 'lib'))
    assert ActiveSupport::Dependencies.load_once_paths.include?(File.join(plugin_fixture_path('default/acts/acts_as_chunky_bacon'), 'lib'))
  end

  def test_should_add_all_load_paths_from_a_plugin_to_LOAD_PATH_array
    plugin_load_paths = ["a", "b"]
    plugin = stub(:load_paths => plugin_load_paths)
    @loader.stubs(:plugins).returns([plugin])

    @loader.add_plugin_load_paths

    plugin_load_paths.each { |path| assert $LOAD_PATH.include?(path) }
  end


  private
    def reset_load_path!
      $LOAD_PATH.clear
      ORIGINAL_LOAD_PATH.each { |path| $LOAD_PATH << path }
    end
end