@Test
    public void encode() {
        RpcSofaTracer tracer = new RpcSofaTracer();
        tracer.startRpc(new SofaRequest());
    }
@author <a href="mailto:zhanggeng.zg@antfin.com">GengZhang</a>
tracer/tracer-opentracing/src/test/java/com/alipay/sofa/rpc/tracer/sofatracer/log/digest/RpcClientDigestSpanEncoderTest.java