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

    https://github.com/apache/spark/pull/14167#discussion_r70955348
  
    --- Diff: 
core/src/test/scala/org/apache/spark/scheduler/cluster/mesos/MesosClusterSchedulerSuite.scala
 ---
    @@ -172,4 +187,28 @@ class MesosClusterSchedulerSuite extends SparkFunSuite 
with LocalSparkContext wi
           assert(escape(s"onlywrap${char}this") === 
wrapped(s"onlywrap${char}this"))
         })
       }
    +
    +  test("supports spark.mesos.driverEnv.*") {
    +    setScheduler()
    +
    +    val mem = 1000
    +    val cpu = 1
    +
    +    val response = scheduler.submitDriver(
    +      new MesosDriverDescription("d1", "jar", mem, cpu, true,
    +        command,
    +        Map("spark.mesos.executor.home" -> "test",
    +          "spark.app.name" -> "test",
    +          "spark.mesos.driverEnv.TEST_ENV" -> "TEST_VAL"),
    +        "s1",
    +        new Date()))
    +    assert(response.success)
    +
    +    val offer = Utils.createOffer("o1", "s1", mem, cpu)
    +    scheduler.resourceOffers(driver, List(offer).asJava)
    +    val tasks = Utils.verifyTaskLaunched(driver, "o1")
    +    val env = 
tasks(0).getCommand.getEnvironment.getVariablesList.asScala.map(v =>
    --- End diff --
    
    use head instead of task(0)


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