Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/19150
Looks `stop ensures correct shutdown` in `BlockGeneratorSuite` is dependent
on interrupting - http://www.scalatest.org/release_notes/3.0.0:
> If you were relying on the default behavior of interrupting a thread on
the JVM in ScalaTest 2.2.x, you'll need to define an implicit val referring to
a `ThreadSignaler`
ScalaTest looks they changed the default for good reasons bug looks we
should explicitly set `ThreadSignaler` to keep the previous behaviour more
conservatively.
```scala
implicit val defaultSignaler: Signaler = ThreadSignaler
```
I just double checked this passes the pending tests.
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