function testIntegratedRecursion()
{
$numbers = new qinq\Collection([1, 2, [3, 4, [5, 6]], 7, [8, [9, 10]]]);
$matches = [1, 4, 9, 16, 25, 36, 49, 64, 81, 100];
foreach ($numbers->recursive(function ($value) {
return $value * $value;
})->flatten() as $number) {
$match = array_shift($matches);
$this->assertEquals($match, $number);
}
}
