Scala Spark Streaming unit test with spark-testing-base throws error - scala

Question

I was trying to run a unit test on my spark streaming code with spark-testing-base. And I am having trouble running their sample-codes.
Here is the code snippet I copied
import com.holdenkarau.spark.testing.SharedSparkContext
import org.scalatest.FunSuite
class SampleTest extends FunSuite with SharedSparkContext {
test("test initializing spark context") {
val list = List(1, 2, 3, 4)
val rdd = sc.parallelize(list)
assert(rdd.count === list.length)
}
}
And here is the stacktrace of errors.
18/10/19 02:08:01 WARN NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
An exception or error caused a run to abort.
java.lang.ExceptionInInitializerError
at org.apache.spark.SparkContext.withScope(SparkContext.scala:701)
at org.apache.spark.SparkContext.parallelize(SparkContext.scala:718)
at com.myproject.SampleTest$$anonfun$1.apply(DStreamTransformSpec.scala:11)
at com.myproject.analytic.SampleTest$$anonfun$1.apply(DStreamTransformSpec.scala:9)
at org.scalatest.OutcomeOf$class.outcomeOf(OutcomeOf.scala:85)
at org.scalatest.OutcomeOf$.outcomeOf(OutcomeOf.scala:104)
I am including my build.sbt not sure if this help.
version := "0.1"
scalaVersion := "2.11.12"
libraryDependencies += "org.apache.spark" %% "spark-streaming" % "2.2.0"
libraryDependencies += "org.apache.bahir" %% "spark-streaming-pubsub" % "2.2.0"
libraryDependencies += "com.typesafe.play" %% "play-json" % "2.6.7"
libraryDependencies += "com.google.cloud" % "google-cloud-datastore" % "1.40.0"
// For test
libraryDependencies += "org.scalactic" %% "scalactic" % "3.0.5"
libraryDependencies += "org.scalatest" %% "scalatest" % "3.0.5" % "test"
libraryDependencies += "com.holdenkarau" %% "spark-testing-base" % "2.2.0_0.10.0" % "test"
fork in Test := true
javaOptions ++= Seq("-Xms512M", "-Xmx2048M", "-XX:MaxPermSize=2048M", "-XX:+CMSClassUnloadingEnabled")
assemblyMergeStrategy in assembly := {
case PathList("META-INF", xs # _*) => MergeStrategy.discard
case x => MergeStrategy.first
}
assemblyShadeRules in assembly := Seq(
ShadeRule.rename("com.google.common.**" -> "repackaged.com.google.common.#1").inAll,
ShadeRule.rename("com.google.protobuf.**" -> "repackaged.com.google.protobuf.#1").inAll
)
And is there any other tools, that are recommended to do testing with DStream?

Answer 1

Possibly you might have forgotten? I don't see it in build.sbt
parallelExecution in Test := false