root/branches/2-1-caching/railties/test/plugin_locator_test.rb

require File.dirname(__FILE__) + '/plugin_test_helper'

uses_mocha "Plugin Locator Tests" do

  class PluginLocatorTest < Test::Unit::TestCase
  
    def test_should_require_subclasses_to_implement_the_plugins_method
      assert_raises(RuntimeError) do
        Rails::Plugin::Locator.new(nil).plugins
      end
    end
  
    def test_should_iterator_over_plugins_returned_by_plugins_when_calling_each
      locator = Rails::Plugin::Locator.new(nil)
      locator.stubs(:plugins).returns([:a, :b, :c])
      plugin_consumer = mock
      plugin_consumer.expects(:consume).with(:a)
      plugin_consumer.expects(:consume).with(:b)
      plugin_consumer.expects(:consume).with(:c)
    
      locator.each do |plugin|
        plugin_consumer.consume(plugin)
      end
    end
  
  end


  class PluginFileSystemLocatorTest < Test::Unit::TestCase
    def setup
      @configuration = Rails::Configuration.new
      # We need to add our testing plugin directory to the plugin paths so
      # the locator knows where to look for our plugins
      @configuration.plugin_paths << plugin_fixture_root_path
      @initializer       = Rails::Initializer.new(@configuration)
      @locator           = Rails::Plugin::FileSystemLocator.new(@initializer)
      @valid_plugin_path = plugin_fixture_path('default/stubby')
      @empty_plugin_path = plugin_fixture_path('default/empty')
    end

    def test_should_return_rails_plugin_instances_when_calling_create_plugin_with_a_valid_plugin_directory
      assert_kind_of Rails::Plugin, @locator.send(:create_plugin, @valid_plugin_path)  
    end
  
    def test_should_return_nil_when_calling_create_plugin_with_an_invalid_plugin_directory
      assert_nil @locator.send(:create_plugin, @empty_plugin_path)  
    end
  
    def test_should_return_all_plugins_found_under_the_set_plugin_paths
      assert_equal ["a", "acts_as_chunky_bacon", "plugin_with_no_lib_dir", "stubby"], @locator.plugins.map(&:name)
    end
  
    def test_should_find_plugins_only_under_the_plugin_paths_set_in_configuration
      @configuration.plugin_paths = [File.join(plugin_fixture_root_path, "default")]
      assert_equal ["acts_as_chunky_bacon", "plugin_with_no_lib_dir", "stubby"], @locator.plugins.map(&:name)
    
      @configuration.plugin_paths = [File.join(plugin_fixture_root_path, "alternate")]
      assert_equal ["a"], @locator.plugins.map(&:name)
    end
  
    def test_should_not_raise_any_error_and_return_no_plugins_if_the_plugin_path_value_does_not_exist
      @configuration.plugin_paths = ["some_missing_directory"]
      assert_nothing_raised do
        assert @locator.plugins.empty?
      end
    end
  end

end # uses_mocha