code: @Test public void testObject(){
    RpcContext context=RpcContext.getContext();
    Map<String,Object> map=new HashMap<String,Object>();
    map.put("_11","1111");
    map.put("_22","2222");
    map.put(".33","3333");
    map.forEach(context::set);
    Assert.assertEquals(map,context.get());
    Assert.assertEquals("1111",context.get("_11"));
    context.set("_11","11.11");
    Assert.assertEquals("11.11",context.get("_11"));
    context.set(null,"22222");
    context.set("_22",null);
    Assert.assertEquals("22222",context.get(null));
    Assert.assertNull(context.get("_22"));
    Assert.assertNull(context.get("_33"));
    Assert.assertEquals("3333",context.get(".33"));
    map.keySet().forEach(context::remove);
    Assert.assertNull(context.get("_11"));
  }
  