Pinq\Tests\Integration\Collection\GroupJoinApplyTest::testThatApplyGroupJoinWithDefaultValueOperatedCorrectly PHP Method

    public function testThatApplyGroupJoinWithDefaultValueOperatedCorrectly(\Pinq\ICollection $collection, array $data)
    {
        $collection->groupJoin(range(1, 20, 2))->on(function ($outer, $inner) {
            return $outer % 3 !== 0 && $outer * 2 >= $inner;
        })->withDefault('<MUL3>')->apply(function (&$outer, \Pinq\ITraversable $innerGroup) {
            $outer .= ':' . $innerGroup->implode(',');
        });
        $this->assertMatchesValues($collection, ['1:1', '2:1,3', '3:<MUL3>', '4:1,3,5,7', '5:1,3,5,7,9', '6:<MUL3>', '7:1,3,5,7,9,11,13', '8:1,3,5,7,9,11,13,15', '9:<MUL3>', '10:1,3,5,7,9,11,13,15,17,19']);
    }