public function testGetSetPrefix()
 {
     $prefix = 'abc';
     $mock = new MemcachedMock();
     $this->assertSame('', $mock->getOption(-1002));
     $mock->setPrefix($prefix);
     $this->assertSame($prefix, $mock->getPrefix());
     $this->assertSame($prefix, $mock->getOption(-1002));
 }