Work on HDFS-10891 started by Mingliang Liu.
> Über-jira: Test Improvement by adding missing test cases for existing code
> --------------------------------------------------------------------------
>                 Key: HDFS-10891
>                 URL: https://issues.apache.org/jira/browse/HDFS-10891
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: test
>            Reporter: Mingliang Liu
>            Assignee: Mingliang Liu
> We have covered some test cases in our nightly run and we'd like to backport 
> those test cases to the community code branch. This work includes the efforts 
> but not limited to:
> # Add more *meaningful* test cases for existing code so it's hard to break it 
> as stability and compatibility should always be guarded if possible
> # Refactor existing tests that share common code snippet (e.g. helper 
> methods) and/or logic (e.g. set up a MiniDFSCluster). One approach that is 
> not popular (which it should) is @Parameterized tests
> # Reduce unnecessary overhead in unit tests (e.g. long interval sleep, build 
> MiniDFSCluster multiple times instead of reusing the same one). Some of the 
> cases were addressed by [HDFS-10666].
> This is not a long-term work to cover all future improvement in unit tests. 
> We'll be happy to resolve this after our internal test cases (will file 
> separate JIRAs for that) are mostly addressed/considered.

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