Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/14551#discussion_r74005614
--- Diff: core/src/test/scala/org/apache/spark/util/UtilsSuite.scala ---
@@ -874,4 +874,38 @@ class UtilsSuite extends SparkFunSuite with
ResetSystemProperties with Logging {
}
}
}
+
+ test("chi square test of randomizeInPlace") {
+ // Parameters
+ val arraySize = 10
+ val numTrials = 1000
+ val threshold = 0.05
+ val seed = 1L
+
+ // results[i][j]: how many times Utils.randomize moves an element from
position j to position i
+ val results: Array[Array[Long]] = Array.ofDim(arraySize, arraySize)
--- End diff --
Some minor style things -- just omit the type here
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