Ouzo\Db\WhereClause\WhereClause::exists PHP Метод

    public static function exists(ModelQueryBuilder $queryBuilder)
    {
        return new ExistsClause($queryBuilder->getQuery());
    }

 /**
  * @test
  */
 public function shouldBuildExistsClause()
 {
     // when
     $result = WhereClause::exists(Product::where(array('name' => 'phone')));
     // then
     $this->assertEquals(array('phone'), $result->getParameters());
     Assert::thatString($result->toSql())->startsWith('EXISTS (SELECT')->endsWith('FROM products WHERE name = ?)');
 }