Github user vanzin commented on a diff in the pull request:

    https://github.com/apache/spark/pull/4711#discussion_r25119320
  
    --- Diff: 
yarn/src/test/scala/org/apache/spark/deploy/yarn/ClientSuite.scala ---
    @@ -39,7 +38,15 @@ import scala.util.Try
     import org.apache.spark.{SparkException, SparkConf}
     import org.apache.spark.util.Utils
     
    -class ClientSuite extends FunSuite with Matchers {
    +class ClientSuite extends FunSuite with Matchers with BeforeAndAfterAll {
    +
    +  override def beforeAll(): Unit = {
    +    System.setProperty("SPARK_YARN_MODE", "true")
    +  }
    +
    +  override def afterAll(): Unit = {
    +    System.setProperty("SPARK_YARN_MODE", "")
    --- End diff --
    
    `System.clearProperty()`?


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