[Test] add test for common-config

[slievrly]

Signed-off-by: jimin.jm slievrly@163.com

What is the purpose of the change

[Test] add test for EnvironmentConfiguration、InmemoryConfiguration、SystemConfiguration

Brief changelog

[Test] add test for common-config

Verifying this change

CI

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[Moriadry-zz]

some little requests, others LGTM

[slievrly]

@moriadry all fixed.

[codecov-io]

Codecov Report

Merging #4208 into master will increase coverage by 0.06%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             master   #4208      +/-   ##
===========================================
+ Coverage     62.93%     63%   +0.06%     
+ Complexity      507     505       -2     
===========================================
  Files           769     769              
  Lines         33058   33058              
  Branches       5217    5217              
===========================================
+ Hits          20806   20827      +21     
+ Misses         9858    9826      -32     
- Partials       2394    2405      +11

Impacted Files	Coverage Δ	Complexity Δ
...bo/rpc/cluster/support/FailbackClusterInvoker.java	67.21% <0%> (-3.28%)	0% <0%> (ø)
...ache/dubbo/registry/multiple/MultipleRegistry.java	62.67% <0%> (-1.41%)	20% <0%> (-2%)
...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)	⬇️
...n/java/org/apache/dubbo/common/utils/UrlUtils.java	78.04% <0%> (ø)	0% <0%> (ø)	⬇️
...ibaba/dubbo/registry/support/AbstractRegistry.java	0% <0%> (ø)	0% <0%> (ø)	⬇️
...java/org/apache/dubbo/remoting/utils/UrlUtils.java	57.14% <0%> (ø)	0% <0%> (ø)	⬇️
.../remoting/transport/netty4/NettyClientHandler.java	68.42% <0%> (ø)	0% <0%> (ø)	⬇️
...bo/remoting/transport/netty4/NettyTransporter.java	100% <0%> (ø)	0% <0%> (ø)	⬇️
...rc/main/java/org/apache/dubbo/rpc/AppResponse.java	72.34% <0%> (ø)	0% <0%> (ø)	⬇️
... and 15 more

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[lovepoem]

LGTM