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

    https://github.com/apache/spark/pull/22805#discussion_r227527156
  
    --- Diff: 
resource-managers/kubernetes/integration-tests/src/test/scala/org/apache/spark/deploy/k8s/integrationtest/backend/IntegrationTestBackend.scala
 ---
    @@ -30,14 +30,16 @@ private[spark] trait IntegrationTestBackend {
     private[spark] object IntegrationTestBackendFactory {
       val deployModeConfigKey = "spark.kubernetes.test.deployMode"
     
    +  val backendMinikube = "minikube"
    +  val backendDockerForDesktop = "docker-for-desktop"
    +
       def getTestBackend: IntegrationTestBackend = {
         val deployMode = Option(System.getProperty(deployModeConfigKey))
    -      .getOrElse("minikube")
    -    if (deployMode == "minikube") {
    -      MinikubeTestBackend
    -    } else {
    -      throw new IllegalArgumentException(
    -        "Invalid " + deployModeConfigKey + ": " + deployMode)
    +      .getOrElse(backendMinikube)
    +    deployMode match {
    +      case `backendMinikube` => MinikubeTestBackend
    +      case `backendDockerForDesktop` => DockerForDesktopBackend
    --- End diff --
    
    Can you add a README to explain how to run with docker-for-desktop, by 
specifying --deploy-mode


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