public function testWriteSession()
    {
        $this->memcache
            ->expects($this->once())
            ->method('set')
            ->with(self::PREFIX.'id', 'data', 0, $this->equalTo(time() + self::TTL, 2))
            ->will($this->returnValue(true))
        ;

        $this->assertTrue($this->storage->write('id', 'data'));
    }
 public function testWriteSession()
 {
     $this->memcache->expects($this->once())->method('set')->will($this->returnValue(true));
     $this->assertTrue($this->storage->write('', ''));
 }