Add helper script for test reduction #30033
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This is a helper script to automate the process of finding a minimal subset of tests which still fail. This is useful when debugging a test failure which involves interactions between tests.
ifreund
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Code: Tests
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Summary
SUMMARY: Infrastructure "Add developer helper script for test case reduction"
Purpose of change
Running all the tests is slow, but running just one test is not always sufficient to reproduce a failure. Manually finding a good subset of tests to run is annoying.
Describe the solution
This is a helper script to automate the process of finding a minimal subset of tests which still fail. This is useful when debugging a test failure which involves interactions between tests.
Note it uses multidelta; you'll have to install that first (it's available via most Linux distributions' package managers).
Additional context
Written while I was working on #30031, but I've done the same process by hand several times before while figuring out other bugs.