[Dubbo - unit test coverage] dubbo-common Unit test coverage

[zonghaishang]

What is the purpose of the change

unit test coverage, refer: #1680

Brief changelog

dubbo-common(beanutil & bytecode & compiler & extension).

Verifying this change

ci passed

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[codecov-io]

Codecov Report

Merging #2094 into master will increase coverage by 1.1%.
The diff coverage is 68.75%.

@@             Coverage Diff             @@
##             master    #2094     +/-   ##
===========================================
+ Coverage     53.05%   54.15%   +1.1%     
- Complexity     4957     5077    +120     
===========================================
  Files           559      559             
  Lines         24894    24905     +11     
  Branches       4432     4438      +6     
===========================================
+ Hits          13207    13487    +280     
+ Misses         9667     9382    -285     
- Partials       2020     2036     +16

Impacted Files	Coverage Δ	Complexity Δ
...e/dubbo/common/beanutil/JavaBeanSerializeUtil.java	79.38% <ø> (+6.52%)	86 <0> (+18)	⬆️
...apache/dubbo/common/extension/ExtensionLoader.java	72.7% <100%> (+0.05%)	116 <1> (ø)	⬇️
...g/apache/dubbo/common/bytecode/ClassGenerator.java	59% <42.85%> (+4.57%)	46 <2> (+3)	⬆️
...ache/dubbo/common/compiler/support/ClassUtils.java	52.97% <87.5%> (+52.97%)	61 <0> (+61)	⬆️
...ubbo/common/compiler/support/AdaptiveCompiler.java	77.77% <0%> (-11.12%)	3% <0%> (-1%)
.../dubbo/remoting/transport/netty4/NettyChannel.java	61.25% <0%> (-5%)	21% <0%> (-2%)
...he/dubbo/remoting/transport/netty/NettyServer.java	67.85% <0%> (-3.58%)	8% <0%> (-1%)
...e/dubbo/remoting/transport/netty4/NettyServer.java	72.13% <0%> (-3.28%)	9% <0%> (-1%)
...rpc/protocol/dubbo/telnet/InvokeTelnetHandler.java	51.89% <0%> (-2.54%)	11% <0%> (-1%)
...apache/dubbo/rpc/protocol/dubbo/DubboProtocol.java	59.16% <0%> (+0.83%)	31% <0%> (+1%)	⬆️
... and 14 more

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[lovepoem]

Look good to me