optimize junit Assert usage

[slievrly]

Signed-off-by: jimin.jm [email protected]

What is the purpose of the change

optimize junit Assert usage

Brief changelog

optimize junit Assert usage

Verifying this change

ci

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[codecov-io]

Codecov Report

Merging #4214 into master will increase coverage by 0.05%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #4214      +/-   ##
============================================
+ Coverage     62.93%   62.98%   +0.05%     
- Complexity      507      511       +4     
============================================
  Files           769      769              
  Lines         33058    33350     +292     
  Branches       5217     5267      +50     
============================================
+ Hits          20806    21007     +201     
- Misses         9858     9946      +88     
- Partials       2394     2397       +3

Impacted Files	Coverage Δ	Complexity Δ
.../remoting/transport/netty4/NettyClientHandler.java	58.82% <0%> (-9.6%)	0% <0%> (ø)
...che/dubbo/remoting/transport/mina/MinaChannel.java	44.73% <0%> (-9.22%)	17% <0%> (ø)
...e/dubbo/remoting/transport/netty/NettyChannel.java	57.64% <0%> (-4.71%)	20% <0%> (-1%)
...ml/rpc/protocol/xmlrpc/XmlRpcProxyFactoryBean.java	63.88% <0%> (-2.78%)	7% <0%> (+2%)
.../main/java/org/apache/dubbo/rpc/RpcInvocation.java	65.25% <0%> (-1.42%)	0% <0%> (ø)
...dubbo/rpc/protocol/dubbo/CallbackServiceCodec.java	80.14% <0%> (-0.74%)	0% <0%> (ø)
...main/java/org/apache/dubbo/remoting/Constants.java	100% <0%> (ø)	0% <0%> (ø)	⬇️
...ibaba/dubbo/registry/support/AbstractRegistry.java	0% <0%> (ø)	0% <0%> (ø)	⬇️
...bo/remoting/transport/netty4/NettyTransporter.java	100% <0%> (ø)	0% <0%> (ø)	⬇️
...ibaba/dubbo/registry/support/FailbackRegistry.java	0% <0%> (ø)	0% <0%> (ø)	⬇️
... and 13 more

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[lovepoem]

LGTM