public function testAddInvolvedTable()
 {
     $b = new WhereBuilder();
     $b->setRootModel('Blog');
     $b->addInvolvedTable('articles.author');
     $this->assertEquals('Article', $b->getInvolvedModel('articles'));
     $this->assertEquals(Article::table(), $b->getInvolvedTable('articles'));
     $jc = (new JoinClause('articles', 'articles'))->on('_', 'id', 'articles', 'blog_id');
     $this->assertEquals($jc, $b->getJoinClause('articles'));
     $this->assertEquals('Author', $b->getInvolvedModel('articles.author'));
     $this->assertEquals(Author::table(), $b->getInvolvedTable('articles.author'));
     $jc = (new JoinClause('authors', 'articles.author'))->on('articles', 'author_id', 'articles.author', 'id');
     $this->assertEquals($jc, $b->getJoinClause('articles.author'));
 }