public function testSetLifetime() {
$key = 'asdf';
$expiresKey = 'asdf.expires';
$value = 'qwerty';
$this->inner
->expects($this
->at(0))
->method('set')
->with($expiresKey, $this
->greaterThanOrEqual(time() + $this->lifetime));
$this->inner
->expects($this
->at(1))
->method('set')
->with($key, $value);
$this->cache
->set($key, $value);
}