Pinq\Tests\Integration\Traversable\GroupByTest::testThatGroupByElementReturnsCorrectTraversableType PHP Метод

    public function testThatGroupByElementReturnsCorrectTraversableType(\Pinq\ITraversable $traversable, array $data)
    {
        $groups = $traversable->groupBy(function ($i) {
            return $i;
        });
        foreach ($groups as $group) {
            if ($traversable instanceof \Pinq\IQueryable) {
                $this->assertInstanceOf(\Pinq\IQueryable::ITRAVERSABLE_TYPE, $group);
            } elseif ($traversable instanceof \Pinq\IRepository) {
                $this->assertInstanceOf(\Pinq\IRepository::IREPOSITORY_TYPE, $group);
            } else {
                $this->assertInstanceOf(get_class($traversable), $group);
            }
        }
    }