bugfix: fixed bugs in EventBus unit tests

[funky-eyes]

Ⅰ. Describe what this PR did

单独测试DefaultCoreForEventBusTest#test时并不会出现,当与coordinator目录下的其它单元测试一并测试时,由于其中也存在需要异步提交的事务单测,导致GlobalTransactionEventSubscriber中的processGlobalTransactionEvent会进入多次相同的事务状态更改通知,导致单测无法通过
目前有2个修复方案:
1.如上面说的sleep,比较粗暴,但是能解决
2.Assertions.assertEquals强行要求了事务状态变更只能1次的通知,我觉得只要不是null就可以接受了
pr中采用方案1
理由:方案一虽然粗暴但是不会改变此单测的目的,而方案二的话就把结果改变了

Ⅱ. Does this pull request fix one issue?

Ⅲ. Why don't you add test cases (unit test/integration test)?

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[codecov-io]

Codecov Report

Merging #3607 (0c46f82) into develop (2dac3a5) will increase coverage by 0.02%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##             develop    #3607      +/-   ##
=============================================
+ Coverage      52.12%   52.15%   +0.02%     
- Complexity      3502     3510       +8     
=============================================
  Files            638      638              
  Lines          21108    21108              
  Branches        2618     2613       -5     
=============================================
+ Hits           11003    11009       +6     
+ Misses          9016     9014       -2     
+ Partials        1089     1085       -4     

Impacted Files	Coverage Δ	Complexity Δ
...tasource/sql/struct/cache/MysqlTableMetaCache.java	82.35% <0.00%> (-1.18%)	10.00% <0.00%> (-1.00%)
...rage/redis/store/RedisTransactionStoreManager.java	64.38% <0.00%> (+0.45%)	38.00% <0.00%> (+1.00%)
...torage/file/store/FileTransactionStoreManager.java	57.69% <0.00%> (+0.64%)	29.00% <0.00%> (+1.00%)
...in/java/io/seata/server/session/SessionHolder.java	56.34% <0.00%> (+3.17%)	34.00% <0.00%> (+4.00%)

[slievrly]

LGTM

[l81893521]

LGTM