hddong commented on a change in pull request #25389: [SPARK-28657][CORE] Fix
currentContext Instance failed sometimes
URL: https://github.com/apache/spark/pull/25389#discussion_r321563097
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File path: core/src/test/scala/org/apache/spark/util/UtilsSuite.scala
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@@ -924,6 +926,24 @@ class UtilsSuite extends SparkFunSuite with
ResetSystemProperties with Logging {
}
}
+ test("test class ClassCastException") {
Review comment:
> Yes, but you're not testing anything in Spark, so I don't think this is
useful. You're just copying the same code and asserting that it actually still
fails before the change.
>
> Existing tests don't catch this case?
Yes, please review the new change, and I will delete this test. I just want
to show you that it's always thrown exception.
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