adding test == others fail??? (intermediate) anthony explains

today I show off a very strange bug in `black`'s testsuite -- and then how I found the problem which led to the fix!

- what is test pollution?    • finding and fixing test pollution! (i...  
- fixing a flaky test with detect-test-pollution:    • fix flaky tests with detect-test-poll...  
- debugging a sentry test pollution:    • debugging a sentry test pollution!  (...  

playlist:    • anthony explains  

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