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

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

uses_mocha "Plugin Tests" do

  class PluginTest < Test::Unit::TestCase

    def setup
      @initializer       = Rails::Initializer.new(Rails::Configuration.new)
      @valid_plugin_path = plugin_fixture_path('default/stubby')
      @empty_plugin_path = plugin_fixture_path('default/empty')    
    end

    def test_should_determine_plugin_name_from_the_directory_of_the_plugin
      assert_equal 'stubby', plugin_for(@valid_plugin_path).name
      assert_equal 'empty', plugin_for(@empty_plugin_path).name
    end

    def test_should_not_be_loaded_when_created
      assert !plugin_for(@valid_plugin_path).loaded?
    end

    def test_should_be_marked_as_loaded_when_load_is_called
      plugin = plugin_for(@valid_plugin_path)
      assert !plugin.loaded?
      plugin.stubs(:evaluate_init_rb)
      assert_nothing_raised do
        plugin.send(:load, anything)
      end
      assert plugin.loaded?
    end
  
    def test_should_determine_validity_of_given_path
      # This is a plugin path, with a lib dir
      assert plugin_for(@valid_plugin_path).valid?
      # This just has an init.rb and no lib dir
      assert plugin_for(plugin_fixture_path('default/plugin_with_no_lib_dir')).valid?
      # This would be a plugin path, but the directory is empty
      assert !plugin_for(plugin_fixture_path('default/empty')).valid?
      # This is a non sense path
      assert !plugin_for(plugin_fixture_path('default/this_directory_does_not_exist')).valid?
    end
  
    def test_should_return_empty_array_for_load_paths_when_plugin_has_no_lib_directory
      assert_equal [], plugin_for(plugin_fixture_path('default/plugin_with_no_lib_dir')).load_paths
    end
  
    def test_should_return_array_with_lib_path_for_load_paths_when_plugin_has_a_lib_directory
      expected_lib_dir = File.join(plugin_fixture_path('default/stubby'), 'lib')
      assert_equal [expected_lib_dir], plugin_for(plugin_fixture_path('default/stubby')).load_paths
    end
  
    def test_should_raise_a_load_error_when_trying_to_determine_the_load_paths_from_an_invalid_plugin
      assert_nothing_raised do
        plugin_for(@valid_plugin_path).load_paths
      end
    
      assert_raises(LoadError) do
        plugin_for(@empty_plugin_path).load_paths
      end
    
      assert_raises(LoadError) do
        plugin_for('this_is_not_a_plugin_directory').load_paths
      end
    end
  
    def test_should_raise_a_load_error_when_trying_to_load_an_invalid_plugin
      # This path is fine so nothing is raised
      assert_nothing_raised do
        plugin = plugin_for(@valid_plugin_path)
        plugin.stubs(:evaluate_init_rb)
        plugin.send(:load, @initializer)
      end
    
      # This is an empty path so it raises
      assert_raises(LoadError) do
        plugin = plugin_for(@empty_plugin_path)
        plugin.stubs(:evaluate_init_rb)      
        plugin.send(:load, @initializer)
      end
    
      assert_raises(LoadError) do
        plugin = plugin_for('this_is_not_a_plugin_directory')
        plugin.stubs(:evaluate_init_rb)
        plugin.send(:load, @initializer)
      end
    end
    
    def test_should_raise_a_load_error_when_trying_to_access_load_paths_of_an_invalid_plugin
      # This path is fine so nothing is raised
      assert_nothing_raised do
        plugin_for(@valid_plugin_path).load_paths
      end
    
      # This is an empty path so it raises
      assert_raises(LoadError) do
        plugin_for(@empty_plugin_path).load_paths
      end
    
      assert_raises(LoadError) do
        plugin_for('this_is_not_a_plugin_directory').load_paths
      end
    end    
  
    def test_loading_a_plugin_gives_the_init_file_access_to_all_it_needs
      failure_tip = "Perhaps someone has written another test that loads this same plugin and therefore makes the StubbyMixin constant defined already."
      assert !defined?(StubbyMixin), failure_tip
      plugin = plugin_for(@valid_plugin_path)
      plugin.load_paths.each { |path| $LOAD_PATH.unshift(path) }
      # The init.rb of this plugin raises if it doesn't have access to all the things it needs
      assert_nothing_raised do
        plugin.load(@initializer)
      end
      assert defined?(StubbyMixin)
    end
    
    def test_should_sort_naturally_by_name
      a = plugin_for("path/a")
      b = plugin_for("path/b")
      z = plugin_for("path/z")
      assert_equal [a, b, z], [b, z, a].sort
    end
    
    def test_should_only_be_loaded_once
      plugin = plugin_for(@valid_plugin_path)
      assert !plugin.loaded?
      plugin.expects(:evaluate_init_rb)
      assert_nothing_raised do
        plugin.send(:load, @initializer)
        plugin.send(:load, @initializer)
      end
      assert plugin.loaded?
    end
  
    private
  
      def plugin_for(path)
        Rails::Plugin.new(path)
      end
  end

end # uses_mocha