Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/3739#discussion_r22085986
--- Diff: core/src/main/scala/org/apache/spark/TestUtils.scala ---
@@ -107,4 +107,19 @@ private[spark] object TestUtils {
assert(out.exists(), "Destination file not moved: " +
out.getAbsolutePath())
out
}
+
+ /** Allows system properties to be changed in tests */
+ def withSystemProperty[T](property: String, value: String)(block: => T):
T = {
--- End diff --
This was some old code that was originally located in another file. I
suppose I could remove it now, since it's probably subsumed by
`ResetSystemProperties` in most cases.
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