public function largeDataIsStored()
{
$backend = $this->setUpBackend();
$data = str_repeat('abcde', 1024 * 1024);
$identifier = 'tooLargeData' . md5(uniqid(mt_rand(), true));
$backend->set($identifier, $data);
$this->assertTrue($backend->has($identifier));
$this->assertEquals($backend->get($identifier), $data);
}