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Or simply paraphrase the docs from tck/README:
Stochastic tests can yield false positives ("be green") even if for some case, the given implementation may violate the tested behaviour. If for some reason, a stochastic test fails for your implementation, yet you are confident the implementation is correct you can disable them using this flag. Please contact the working group on /~https://github.com/reactive-streams/reactive-streams-jvm in case you encounter such issue with the tests.
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See /~https://github.com/reactive-streams/reactive-streams-jvm/tree/master/tck#test-types-explained
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Good point. I'll add:
"Stochastic in this case means that the Rule is impossible or infeasible to deterministically verify— usually this means that this test case can yield false positives ("be green") even if for some case, the given implementation may violate the tested behaviour."