adoroszlai opened a new pull request, #704:
URL: https://github.com/apache/ratis/pull/704

   ## What changes were proposed in this pull request?
   
   Allow running multiple iterations of tests in `unit.sh` simply by setting 
`ITERATIONS` environment variable.
   
   Results (summary, output of failed tests) for all iterations are saved in 
separate subdirectories.
   
   https://issues.apache.org/jira/browse/RATIS-1658
   
   ## How was this patch tested?
   
   Locally:
   
   ```
   $ ITERATIONS=3 ./dev-support/checks/unit.sh -Dtest=TestLogAppenderWithGrpc
   ...
   
   $ find target/unit -type f | sort
   target/unit/iteration1/failures
   target/unit/iteration1/output.log
   target/unit/iteration1/summary.txt
   target/unit/iteration2/failures
   target/unit/iteration2/output.log
   target/unit/iteration2/summary.txt
   target/unit/iteration3/failures
   target/unit/iteration3/output.log
   target/unit/iteration3/summary.txt
   target/unit/summary.txt
   
   $ cat target/unit/summary.txt
   Iteration 1 exit code: 0
   Iteration 2 exit code: 0
   Iteration 3 exit code: 0
   ```
   
   Sample usage in CI:
   
https://github.com/adoroszlai/incubator-ratis/blob/87eafcd2e19a49c1b251207955f19d5c9f3d0296/.github/workflows/post-commit.yml#L45-L47
   
   Repeated run in CI:
   
https://github.com/adoroszlai/incubator-ratis/runs/7666927698?check_suite_focus=true#step:6:5
   
   Regular CI:
   https://github.com/adoroszlai/incubator-ratis/actions/runs/2794766233


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