Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/19290
I believe the issue with testthat he meatn is, it fails to run tests with
testthat 2.0.0 is released. Just for a reminder, I rushed to update
`appveyor.yml` to use a fixed version
https://github.com/apache/spark/pull/20003 as it broke the tests. There are
some details there to remember back.
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