[Tests] Fix invalid test case in ProcessUtilsTest.testCancelApplication

[zuston]

Purpose of the pull request

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This pull request is code cleanup without any test coverage.

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This change added tests and can be verified as follows:

[codecov-commenter]

Codecov Report

Merging #6130 (7dcffcf) into dev (d7af95f) will decrease coverage by 1.19%.
The diff coverage is 50.00%.

@@             Coverage Diff              @@
##                dev    #6130      +/-   ##
============================================
- Coverage     44.02%   42.83%   -1.20%     
+ Complexity     3701     3611      -90     
============================================
  Files           634      635       +1     
  Lines         26025    25910     -115     
  Branches       2917     2938      +21     
============================================
- Hits          11457    11098     -359     
- Misses        13467    13735     +268     
+ Partials       1101     1077      -24     

Impacted Files	Coverage Δ
...che/dolphinscheduler/common/utils/HadoopUtils.java	28.71% <50.00%> (+0.28%)	⬆️
...he/dolphinscheduler/server/utils/ProcessUtils.java	50.29% <50.00%> (+1.78%)	⬆️
...nscheduler/api/exceptions/ApiExceptionHandler.java	66.66% <0.00%> (-33.34%)	⬇️
...pache/dolphinscheduler/api/dto/TaskStateCount.java	42.85% <0.00%> (-23.81%)	⬇️
...api/service/impl/ProcessDefinitionServiceImpl.java	36.84% <0.00%> (-19.56%)	⬇️
...er/api/service/impl/TaskDefinitionServiceImpl.java	33.33% <0.00%> (-19.45%)	⬇️
...dolphinscheduler/dao/entity/ProcessDefinition.java	54.62% <0.00%> (-14.34%)	⬇️
...uler/api/service/impl/DataAnalysisServiceImpl.java	80.76% <0.00%> (-13.97%)	⬇️
...hinscheduler/api/controller/ProjectController.java	65.21% <0.00%> (-10.79%)	⬇️
...r/api/service/impl/ProcessInstanceServiceImpl.java	63.75% <0.00%> (-9.12%)	⬇️
... and 52 more

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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

52.9% Coverage
0.0% Duplication

[CalvinKirs]

This approach is not recommended. just for the test.

[zuston]

So directly using new HadoopUtils(false) ? Or other approach ?

[CalvinKirs]

I prefer other ways. Or it is recommended to refactor it, and it is not recommended to use static code blocks in this case.

[zuston]

Could you help give me some suggestions? Have no ideas on it. Thanks~

[CalvinKirs]

An important factor in unit testing is structuring your code so that it is suitable for testing. code with excessive static initialization is not a structure that's easily tested. Even you can see that the famous Mockito does not support static method testing so far, my suggestion is You refactor the code and give up the use of static methods. this scenario is not applicable. we cannot use mocks to complete the mocks of external components.