public function testWriteAndRead()
{
$key = 'key';
$data = 'data';
$keys = array($key => $data);
$expiry = null;
$result = $this->Memory->write($keys, $expiry);
$this->assertTrue($result);
$this->assertEqual($this->Memory->cache, $result);
$result = $this->Memory->read(array_keys($keys));
$this->assertEqual($keys, $result);
$this->assertEqual($this->Memory->cache, array($key => $data));
}