require File.expand_path(File.dirname(__FILE__) +  '/abstract_unit')

class ModelObserverTest < Test::Unit::TestCase
  def test_create_observed
    p1, p2 = Person.new(:name => 'One'), Person.new(:name => 'Two')
    
    assert_model_changes 2 do
      assert_equal [p1, p2], ModelObserver.collect { [p1, p2].each(&:save!) }
    end
  end
  
  def test_update_observed
    assert_model_changes 2 do
      objects = ModelObserver.collect do 
        people(:jonathan).update_attributes!(:name => 'New name')
        people(:david).update_attributes(:name => 'New name')
      end
      
      assert_equal [people(:jonathan), people(:david)], objects
    end
  end
  
  def test_update_ignores_unchanged_models
    assert_no_model_changes do
      people(:jonathan).save!
    end
  end
  
  def test_ignore_model_changes
    assert_no_model_changes do
      ModelObserver.ignore do
        Person.create!
      end
    end
  end
  
  def test_collect_exclusively
    assert_model_changes 1 do
      Person.create!
      
      exclusive_objects = ModelObserver.collect_exclusively do
        person = Person.create!
      end
      
      assert_equal 1, exclusive_objects.size
    end
  end
  
  def test_collect_exclusively_inside_ignore
    assert_no_model_changes do
      ModelObserver.ignore do
        exclusive_objects = ModelObserver.collect_exclusively do
          Person.create!
        end
        
        assert_equal 1, exclusive_objects.size
      end
    end
  end
  
  def test_no_model_changes_in_failed_transaction
    assert_no_model_changes do
      begin
        Person.transaction do
          Person.create!
          Person.create!
          assert false
        end
      rescue Test::Unit::AssertionFailedError
      else
        raise "should not be here"
      end
    end
  end
  
  def test_transaction_returns_result_of_block
    assert_equal 5, Person.transaction { 5 }
  end
end