Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/13217#discussion_r64022325
--- Diff: R/WINDOWS.md ---
@@ -11,3 +11,19 @@ include Rtools and R in `PATH`.
directory in Maven in `PATH`.
4. Set `MAVEN_OPTS` as described in [Building
Spark](http://spark.apache.org/docs/latest/building-spark.html).
5. Open a command shell (`cmd`) in the Spark directory and run `mvn
-DskipTests -Psparkr package`
+
+## Unit tests
+
+To run existing unit tests in SparkR on Windows, the following setps are
required (the steps below suppose you are in Spark root directory)
+
+1. Set `HADOOP_HOME`.
+2. Download `winutils.exe` and locate this in `$HADOOP_HOME/bin`.
+
+ It seems not requiring installing Hadoop but only this `winutils.exe`.
It seems not included in Hadoop official binary releases so it should be built
from source but it seems it is able to be downloaded from community (e.g.
[steveloughran/winutils](https://github.com/steveloughran/winutils)).
--- End diff --
CC @steveloughran for comment. I think the paragraph should start with "It
is not included in the Hadoop binary releases, so .... However it is
downloadable from, for example [...]"
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