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

    public function testThatExtendedClassIsMaintainedAfterLongQuery(\Pinq\ICollection $collection)
    {
        $collection = $collection->append([1, 2, 4, 5])->join([6, 7, 8, 9])->on(function () {
            return true;
        })->to(function ($a, $b) {
            return $a + $b;
        })->unique()->select(function ($i) {
            return $i * 10;
        })->indexBy(function ($i) {
            return $i;
        });
        $this->assertExtended($collection);
    }