Ouzo\Restrictions::isNotIn PHP Method

    public static function isNotIn(array $values)
    {
        return new IsNotInRestriction($values);
    }

 /**
  * @test
  */
 public function shouldReturnNullForEmptyArray()
 {
     //given
     $restriction = Restrictions::isNotIn(array());
     //when
     $sql = $restriction->toSql('category_id');
     //then
     $this->assertNull($sql);
 }