Pinq\Tests\Integration\Collection\ExtendedCollectionTest::testThatExtendedClassIsMaintainedAfterGroupByQuery PHP Метод

    public function testThatExtendedClassIsMaintainedAfterGroupByQuery(\Pinq\ICollection $collection)
    {
        $collection = $collection->groupBy(function () {
        });
        $this->assertExtended($collection);
    }