Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/21454#discussion_r191626037
--- Diff: core/src/test/scala/org/apache/spark/SparkConfSuite.scala ---
@@ -25,14 +25,16 @@ import scala.language.postfixOps
import scala.util.{Random, Try}
import com.esotericsoftware.kryo.Kryo
+import org.scalatest.Matchers
import org.apache.spark.deploy.history.config._
import org.apache.spark.internal.config._
import org.apache.spark.network.util.ByteUnit
import org.apache.spark.serializer.{JavaSerializer, KryoRegistrator,
KryoSerializer}
import org.apache.spark.util.{ResetSystemProperties, RpcUtils}
-class SparkConfSuite extends SparkFunSuite with LocalSparkContext with
ResetSystemProperties {
+class SparkConfSuite extends SparkFunSuite with LocalSparkContext with
ResetSystemProperties with
+ Matchers {
--- End diff --
I would do `with Matchers` here.
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