public function testAddAssociationNewObjects()
 {
     $this->fixtures('categories', 'articles', 'articles_categories');
     $article = new Article(array('title' => 'Article A', 'user_id' => 0));
     $category1 = new Category(array('name' => 'Category A', 'parent_id' => 0));
     $category2 = new Category(array('name' => 'Category B', 'parent_id' => 0));
     $article->addCategory($category1);
     $article->addCategory($category2);
     // save, and make sure the association object is created
     $article->save();
     // make sure both were created, and are associated
     $article = Article::find('first', array('conditions' => 'title=:title'), array(':title' => 'Article A'));
     $this->assertTrue($article instanceof Article);
     $cat1 = Category::find('first', array('conditions' => 'name=:nm'), array(':nm' => 'Category A'));
     $cat2 = Category::find('first', array('conditions' => 'name=:nm'), array(':nm' => 'Category B'));
     $this->assertTrue($cat1 instanceof Category);
     $this->assertTrue($cat2 instanceof Category);
     $this->assertEquals($article->categories[0]->id, $cat1->id);
     $this->assertEquals($article->categories[1]->id, $cat2->id);
 }