[NFC/TEST] Resurrect unfinished test for getRelatedCases() #16885
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Overview
This resurrects a 6 year old unfinished test because tests are cool, and also this test counts as a test for another PR which I'll post in a few seconds. It has nothing to do with this, but writing a test for that other PR has little value and would only fail on windows, so here is a test in lieu.
Also note that in endPostProcess() the ampersands can go because: