'Unable to load a Suite class' while running ScalaTest in IntelliJ

Question

I'm having some issues today with running a simple TestKit test in Intellij. The tests are for Scala code (I have the Scala plug-in for Intellij) and are based on Ray Roestenburg's example.

The Intellij project was created using a "Maven Module" which I then added all the dependencies to and created my project. The tests are located in the following place:

ActorBlast/src/test/scala/basicTest.scala

I'm basically "right-clicking" on the test and selecting "Run". What I get is the following error:

"C:\Program Files\Java\jdk1.7.0_25\bin\java" -Didea.launcher.port=7540... Testing started at 2:29 PM ... Unable to load a Suite class. This could be due to an error in your runpath.

Missing class: BasicActorSpec java.lang.ClassNotFoundException: BasicActorSpec at java.net.URLClassLoader$1.run(URLClassLoader.java:366) at java.net.URLClassLoader$1.run(URLClassLoader.java:355) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:354) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) at org.scalatest.tools.Runner$$anonfun$35.apply(Runner.scala:2393) at org.scalatest.tools.Runner$$anonfun$35.apply(Runner.scala:2391) at scala.collection.TraversableLike$$anonfun$filter$1.apply(TraversableLike.scala:264) at scala.collection.immutable.List.foreach(List.scala:318) at scala.collection.TraversableLike$class.filter(TraversableLike.scala:263) at scala.collection.AbstractTraversable.filter(Traversable.scala:105) at org.scalatest.tools.Runner$.doRunRunRunDaDoRunRun(Runner.scala:2391) at org.scalatest.tools.Runner$$anonfun$runOptionallyWithPassFailReporter$2.apply(Runner.scala:1006) at org.scalatest.tools.Runner$$anonfun$runOptionallyWithPassFailReporter$2.apply(Runner.scala:1005) at org.scalatest.tools.Runner$.withClassLoaderAndDispatchReporter(Runner.scala:2659) at org.scalatest.tools.Runner$.runOptionallyWithPassFailReporter(Runner.scala:1005) at org.scalatest.tools.Runner$.run(Runner.scala:845) at org.scalatest.tools.Runner.run(Runner.scala) at org.jetbrains.plugins.scala.testingSupport.scalaTest.ScalaTestRunner.runScalaTest2(ScalaTestRunner.java:144) at org.jetbrains.plugins.scala.testingSupport.scalaTest.ScalaTestRunner.main(ScalaTestRunner.java:35) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)

Process finished with exit code 0

I can't figure out what this means. I've done a lot of searching but can't seem to find an answer. Note that the class the runner is complaining about not finding is the class I'm trying to test/run. The basicTest.scala looks like this:

// Testing specific imports import org.junit.runner.RunWith import org.scalatest.junit.JUnitRunner import org.scalatest.{ShouldMatchers, WordSpecLike, BeforeAndAfterAll} import akka.testkit.{TestKit, DefaultTimeout, ImplicitSender} // Actor specific imports import akka.actor.{ActorRef, Actor, ActorSystem, Props} // Misc. needed imports import scala.concurrent.duration._ import com.typesafe.config.ConfigFactory   // In order to run tests in this module you need to use JUnitRunner (as per scalatest.org) @RunWith(classOf[JUnitRunner]) class BasicActorSpec extends TestKit(ActorSystem("BasicActorSpec", ConfigFactory.parseString(BasicActorSpec.config)))   with DefaultTimeout with ImplicitSender with WordSpecLike with ShouldMatchers with BeforeAndAfterAll {    import BasicActorSpec._    val echoRef = system.actorOf(Props[EchoActor])   val forwardRef = system.actorOf(Props[ForwardActor])    override def afterAll {     shutdown(system)   }     /**    * The actual tests...    */   "An EchoActor" should {     "Respond with the same message it receives" in {       within(500 millis) {         echoRef ! "test"         expectMsg("test")       }     }   }    "A Forwarding Actor" should {     "Forward a message it receives" in {       within(500 millis) {         forwardRef ! "test"         expectMsg("test")       }     }   }  }  /**  * Companion object of test class  */ object BasicActorSpec {    val config =     """       |akka {       | loglevel = "Warning"       |}     """.stripMargin    /**    * Classes of Actors used in testing    */   class EchoActor extends Actor {     def receive = {       case msg => sender ! msg     }   }    class ForwardActor(next: ActorRef) extends Actor {     def receive = {       case msg => next ! msg     }   }  } 

Any help as to why I am getting this error would be GREATLY appreciated.

Answer 1

Run build the project - It helped me to resolve that issue that could have happened to me when I cleared Cache IDEA :) while trying to tackle another issue