public function largeDataIsStored()
{
$backend = $this->setUpBackend();
$data = str_repeat('abcde', 1024 * 1024);
$backend->set('tooLargeData', $data);
$this->assertTrue($backend->has('tooLargeData'));
$this->assertEquals($backend->get('tooLargeData'), $data);
}