code: @Test public void testCacheFactory(){
    URL url=URL.valueOf("test://test:11/test?cache=jacache&.cache.write.expire=1");
    CacheFactory cacheFactory=new MyCacheFactory();
    Invocation invocation=new NullInvocation();
    Cache cache=cacheFactory.getCache(url,invocation);
    cache.put("testKey","testValue");
    org.apache.dubbo.cache.CacheFactory factory=cacheFactory;
    org.apache.dubbo.common.URL u=org.apache.dubbo.common.URL.valueOf("test://test:11/test?cache=jacache&.cache.write.expire=1");
    org.apache.dubbo.rpc.Invocation inv=new RpcInvocation();
    org.apache.dubbo.cache.Cache c=factory.getCache(u,inv);
    String v=(String)c.get("testKey");
    Assert.assertEquals("testValue",v);
  }
  