Add unit test for BitList

[BurningCN]

What is the purpose of the change

Add unit test for BitList

[xiaoheng1]

please remove author

[codecov-commenter]

Codecov Report

Merging #8415 (34368f2) into 3.0 (e2d1ec0) will decrease coverage by 0.42%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                3.0    #8415      +/-   ##
============================================
- Coverage     63.58%   63.15%   -0.43%     
+ Complexity      313      310       -3     
============================================
  Files          1074     1102      +28     
  Lines         45211    46242    +1031     
  Branches       6807     6980     +173     
============================================
+ Hits          28749    29206     +457     
- Misses        13272    13767     +495     
- Partials       3190     3269      +79     

Impacted Files	Coverage Δ
...figcenter/file/FileSystemDynamicConfiguration.java	0.00% <0.00%> (-59.53%)	⬇️
...nfigcenter/nop/NopDynamicConfigurationFactory.java	50.00% <0.00%> (-50.00%)	⬇️
...nfig/configcenter/nop/NopDynamicConfiguration.java	25.00% <0.00%> (-37.50%)	⬇️
...o/registry/zookeeper/ZookeeperRegistryFactory.java	66.66% <0.00%> (-33.34%)	⬇️
...tore/zookeeper/ZookeeperMetadataReportFactory.java	66.66% <0.00%> (-33.34%)	⬇️
...ookeeper/ZookeeperDynamicConfigurationFactory.java	66.66% <0.00%> (-33.34%)	⬇️
...fig/configcenter/TreePathDynamicConfiguration.java	60.00% <0.00%> (-25.72%)	⬇️
...figcenter/AbstractDynamicConfigurationFactory.java	75.00% <0.00%> (-25.00%)	⬇️
...bo/rpc/cluster/support/FailbackClusterInvoker.java	52.45% <0.00%> (-18.04%)	⬇️
...rpc/cluster/router/mesh/route/MeshRuleManager.java	75.00% <0.00%> (-15.00%)	⬇️
... and 167 more

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