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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 FilesJavajdk1.7.0_25binjava" -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 =
 """
 

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

You need to set up the Scala SDK.
1.) Usually, intelliJ will ask you by showing a message on right hand corner of your editor
2.) You can do it by yourself as mentioned on the https://www.jetbrains.com/help/idea/discover-intellij-idea-for-scala.html

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

If you are using IntelliJ to run scalatest make sure the class paths are correct. For example:

 /dummyApp 

your build.sbt should look like, name := "dummyApp". If you name it name := "dummy App" you will get errors.

In my case, I was missing the Scala facet in my module.

https://blog.jetbrains.com/scala/2010/09/02/project-configuration-explained/

I got rid of the error once I configured module properly.

This is how I solved same exception:

--> Right click on your project folder in IDE:

--> Click Add Framework Support
--> Then Check Scala
--> Click OK

This issue happened to me recently when I was trying to run tests in an inherited Scala project using IntelliJ IDEA 2018 (Community Edition). Below steps helped me to fix it:

1. File → Project Structure → Choose specific module → "Paths" tab → Select "Use module compile output path" → Modify "Test output path" to point to test-classes folder. For example:
   
   

   
   

   Output path: /home/rustam/IdeaProjects/project/module/target/scala-2.12/classes
   Test output path: /home/rustam/IdeaProjects/project/module/target/scala-2.12/test-classes

   
   

   
   


2. IntelliJ does not like multiple Scala classes defined in one file, so make sure the test class is named the same as the test file and nest other helper classes, which you can refactor later as necessary.

In my case I had in Preferences -> Build, Execution, Deployment -> sbt

Use sbt shell for build and import checkbox enabled

And the test was not in the expected directory src/test but in src/it (integrated test).

I met this issue when I used Gatling

I fix it by replacing gatling-classes to test-classes on File -> Project Structure -> Modules -> Module Name -> Paths -> Test output path

I encountered the error when the test class was not part of any package.