Github user srowen commented on the issue:

    https://github.com/apache/spark/pull/18728
  
    Hm, is the more basic error here that `object ValidatorParamsSuiteHelpers 
extends SparkFunSuite` ? it seems like it's trying to leverage the temp dir 
cleanup function in the superclass, but it will never be invoked because this 
object is never used as an actual test. What about removing both of those 
superclasses?


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