yangyichao-mango opened a new pull request #3521:
URL: https://github.com/apache/incubator-dolphinscheduler/pull/3521
## What is the purpose of the pull request
*`ProcessDefinitionService` is one of the complex service, so I chose
`ProcessDefinitionServiceTest` be the api service layer test example*
## Brief change log
- *Format the code `ProcessDefinitionServiceImpl` and remove unused code
for clear code*
- *Improvement the code and the coverage of `ProcessDefinitionServiceTest`*
## Verify this pull request
This pull request is already covered by existing tests.
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