Add SplicingIdGeneratorTest class

[Linary]

Change-Id: I701283da13e73df3a454c0a6eac8be355864011d

[codecov]

Codecov Report

Merging #1461 (a9ecf55) into master (558ab02) will increase coverage by 0.44%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #1461      +/-   ##
============================================
+ Coverage     61.74%   62.19%   +0.44%     
- Complexity     5841     5866      +25     
============================================
  Files           381      381              
  Lines         32191    32191              
  Branches       4509     4509              
============================================
+ Hits          19877    20021     +144     
+ Misses        10267    10119     -148     
- Partials       2047     2051       +4     

Impacted Files	Coverage Δ	Complexity Δ
...du/hugegraph/backend/tx/GraphIndexTransaction.java	81.04% <0.00%> (-0.12%)	203.00% <0.00%> (ø%)
.../baidu/hugegraph/backend/query/ConditionQuery.java	86.40% <0.00%> (+0.40%)	106.00% <0.00%> (+1.00%)
.../backend/store/cassandra/CassandraSessionPool.java	57.14% <0.00%> (+1.02%)	11.00% <0.00%> (ø%)
...egraph/backend/store/cassandra/CassandraShard.java	52.77% <0.00%> (+1.85%)	11.00% <0.00%> (ø%)
...in/java/com/baidu/hugegraph/backend/id/IdUtil.java	86.79% <0.00%> (+1.88%)	23.00% <0.00%> (+1.00%)
...va/com/baidu/hugegraph/task/ServerInfoManager.java	73.59% <0.00%> (+2.24%)	54.00% <0.00%> (+2.00%)
...aidu/hugegraph/backend/id/SplicingIdGenerator.java	95.45% <0.00%> (+4.54%)	12.00% <0.00%> (+1.00%)
...h/backend/store/scylladb/ScyllaDBTablesWithMV.java	96.03% <0.00%> (+96.03%)	10.00% <0.00%> (+10.00%)
...graph/backend/store/scylladb/ScyllaDBFeatures.java	100.00% <0.00%> (+100.00%)	3.00% <0.00%> (+3.00%)
.../backend/store/scylladb/ScyllaDBStoreProvider.java	100.00% <0.00%> (+100.00%)	7.00% <0.00%> (+7.00%)

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