Functional\Tests\SortTest::setUp PHP Method

    public function setUp()
    {
        parent::setUp();
        $this->list = ['cat', 'bear', 'aardvark'];
        $this->listIterator = new ArrayIterator($this->list);
        $this->hash = ['c' => 'cat', 'b' => 'bear', 'a' => 'aardvark'];
        $this->hashIterator = new ArrayIterator($this->hash);
        $this->sortCallback = function ($left, $right, $collection) {
            InvalidArgumentException::assertCollection($collection, __FUNCTION__, 3);
            return strcmp($left, $right);
        };
    }