Change main method under dubbo-remoting-api to standard test

[xiaomoran]

Because of the commits linked to the wrong user, I resubmitted a pr and continued #4957 @htynkn

[htynkn]

LGTM. expect that for loop. maybe remove it if it's not necessary for unit test

[htynkn]

I know this is existing code. but I'm thinking what's purpose for this code? looks like this is not necessary for this unit test

[xiaomoran]

Yes, this loop seems to be unnecessary, just to keep the existing code. I have changed it.

[htynkn]

LGTM. will merge it once CI pass

[codecov-io]

Codecov Report

Merging #5026 into master will decrease coverage by 0.06%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #5026      +/-   ##
============================================
- Coverage     63.99%   63.93%   -0.07%     
- Complexity      451      453       +2     
============================================
  Files           769      769              
  Lines         33176    33194      +18     
  Branches       5230     5236       +6     
============================================
- Hits          21231    21222       -9     
- Misses         9523     9551      +28     
+ Partials       2422     2421       -1

Impacted Files	Coverage Δ	Complexity Δ
.../remoting/transport/netty4/NettyServerHandler.java	61.9% <0%> (-9.53%)	0% <0%> (ø)
.../apache/dubbo/rpc/protocol/AsyncToSyncInvoker.java	79.16% <0%> (-8.34%)	0% <0%> (ø)
...ng/transport/dispatcher/all/AllChannelHandler.java	51.42% <0%> (-5.72%)	0% <0%> (ø)
...ng/exchange/support/header/HeartbeatTimerTask.java	73.68% <0%> (-5.27%)	0% <0%> (ø)
.../org/apache/dubbo/remoting/ExecutionException.java	15.78% <0%> (-5.27%)	0% <0%> (ø)
...bbo/registry/support/ProviderConsumerRegTable.java	80.48% <0%> (-4.88%)	0% <0%> (ø)
...onfig/spring/extension/SpringExtensionFactory.java	80.48% <0%> (-4.88%)	0% <0%> (ø)
...exchange/support/header/HeaderExchangeHandler.java	64.75% <0%> (-2.46%)	0% <0%> (ø)
...he/dubbo/registry/multicast/MulticastRegistry.java	67.87% <0%> (-1.81%)	0% <0%> (ø)
...va/org/apache/dubbo/rpc/support/ProtocolUtils.java	70.37% <0%> (-1.63%)	0% <0%> (ø)
... and 14 more

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[htynkn]

Thanks for your contribution