From a6bca3ad02bd896e7637dec37ed8ba1a7306b58c Mon Sep 17 00:00:00 2001
From: Yin Huai <yhuai@databricks.com>
Date: Fri, 26 Aug 2016 19:38:52 -0700
Subject: [PATCH] [SPARK-17266][TEST] Add empty strings to the regressionTests
 of PrefixComparatorsSuite

## What changes were proposed in this pull request?
This PR adds a regression test to PrefixComparatorsSuite's "String prefix comparator" because this test failed on jenkins once (https://amplab.cs.berkeley.edu/jenkins/job/spark-master-test-sbt-hadoop-2.4/1620/testReport/junit/org.apache.spark.util.collection.unsafe.sort/PrefixComparatorsSuite/String_prefix_comparator/).

I could not reproduce it locally. But, let's this test case in the regressionTests.

Author: Yin Huai <yhuai@databricks.com>

Closes #14837 from yhuai/SPARK-17266.
---
 .../util/collection/unsafe/sort/PrefixComparatorsSuite.scala   | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/core/src/test/scala/org/apache/spark/util/collection/unsafe/sort/PrefixComparatorsSuite.scala b/core/src/test/scala/org/apache/spark/util/collection/unsafe/sort/PrefixComparatorsSuite.scala
index b4083230b4..5180c58a56 100644
--- a/core/src/test/scala/org/apache/spark/util/collection/unsafe/sort/PrefixComparatorsSuite.scala
+++ b/core/src/test/scala/org/apache/spark/util/collection/unsafe/sort/PrefixComparatorsSuite.scala
@@ -50,7 +50,8 @@ class PrefixComparatorsSuite extends SparkFunSuite with PropertyChecks {
       ("s1", "s2"),
       ("abc", "世界"),
       ("你好", "世界"),
-      ("你好123", "你好122")
+      ("你好123", "你好122"),
+      ("", "")
     )
     // scalastyle:on
 
-- 
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