public function createTestData()
{
$this->list = ['value0', 'value1', 'value2', 2];
$this->listIterator = new ArrayIterator($this->list);
$this->hash = ['k1' => 'val1', 'k2' => 'val2', 'k3' => 'val3', 'k4' => 2];
$this->hashIterator = new ArrayIterator($this->hash);
}