Github user vanzin commented on the issue:
https://github.com/apache/spark/pull/23037
When I tried to write automated tests for pyspark in the past it was kind
of a pain. It doesn't work the way you expect unless you have a
pseudo-terminal, apparently.
Maybe try to write a test script around it using `pty.spawn` or `pty.fork`.
But to be frank, that sounds more complicated than it's worth...
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