[dubbo-1689]: Enhance the test coverage part-10 : dubbo-plugin module

[beiwei30]

What is the purpose of the change

issue#1689: Enhance the test coverage part-10 : dubbo-plugin module

Brief changelog

dubbo-plugin/dubbo-qos/src/test/java/org/apache/dubbo/qos/server/handler/HttpProcessHandlerTest.java

Verifying this change

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• Write necessary unit-test to verify your logic correction, more mock a little better when cross module dependency exist. If the new feature or significant change is committed, please remember to add integration-test in test module.
• Run mvn clean install -DskipTests & mvn clean test-compile failsafe:integration-test to make sure unit-test and integration-test pass.
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[codecov-io]

Codecov Report

Merging #1993 into master will increase coverage by 0.12%.
The diff coverage is 37.5%.

@@             Coverage Diff              @@
##             master    #1993      +/-   ##
============================================
+ Coverage     50.83%   50.96%   +0.12%     
- Complexity     4767     4774       +7     
============================================
  Files           562      562              
  Lines         25218    25218              
  Branches       4449     4449              
============================================
+ Hits          12820    12852      +32     
+ Misses        10466    10433      -33     
- Partials       1932     1933       +1

Impacted Files	Coverage Δ	Complexity Δ
.../apache/dubbo/qos/protocol/QosProtocolWrapper.java	54.28% <20%> (ø)	6 <0> (ø)	⬇️
.../main/java/org/apache/dubbo/qos/server/Server.java	72.09% <66.66%> (ø)	10 <2> (ø)	⬇️
...e/dubbo/remoting/transport/netty/NettyChannel.java	57.5% <0%> (-8.75%)	19% <0%> (-2%)
...ubbo/rpc/protocol/dubbo/ChannelWrappedInvoker.java	41.66% <0%> (-8.34%)	3% <0%> (ø)
...org/apache/dubbo/rpc/filter/ActiveLimitFilter.java	83.33% <0%> (-5.56%)	6% <0%> (-1%)
...he/dubbo/remoting/transport/netty/NettyServer.java	67.85% <0%> (-3.58%)	8% <0%> (-1%)
...bo/remoting/transport/netty/NettyCodecAdapter.java	53.12% <0%> (-1.57%)	3% <0%> (ø)
.../dubbo/remoting/transport/netty4/NettyChannel.java	66.25% <0%> (+1.25%)	23% <0%> (+1%)	⬆️
...a/org/apache/dubbo/monitor/dubbo/DubboMonitor.java	89.71% <0%> (+1.86%)	15% <0%> (ø)	⬇️
.../dubbo/qos/command/decoder/HttpCommandDecoder.java	73.52% <0%> (+2.94%)	6% <0%> (+1%)	⬆️
... and 4 more

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