Error running Scala tests in Intelli-J

Question

I'm having some problems getting my Scala tests running via the Intelli-J Run/Debug configuration. The tests are working if I run them directly in the SBT console.

My configuration looks like this:

I'm getting this error in the Run console panel:

java.lang.IllegalArgumentException: ERROR: -r has been deprecated for a very long time and is no longer supported, to prepare for reusing it for a different purpose in the near future. Please change all uses of -r to -C.
at org.scalatest.tools.ArgsParser$.checkArgsForValidity(ArgsParser.scala:41)
at org.scalatest.tools.Runner$.runOptionallyWithPassFailReporter(Runner.scala:857)
at org.scalatest.tools.Runner$.run(Runner.scala:850)
at org.scalatest.tools.Runner.run(Runner.scala)
at org.jetbrains.plugins.scala.testingSupport.scalaTest.ScalaTestRunner.runScalaTest2(ScalaTestRunner.java:141)
at org.jetbrains.plugins.scala.testingSupport.scalaTest.ScalaTestRunner.main(ScalaTestRunner.java:32)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:134)

I've checked my plugins are all up-to-date. Do I need to use a particular version of Scala? Or is there some additional setup I'm missing?

Answer 1

It appears to have been a problem with the Scala plugin under Intelli-J 13.

I fixed this by upgrading to Intelli-J 2016.3, which I presume has been changed to pass the newer -C switch to ScalaTestRunner.

@JasonF pointed out in his comment below that a project dependency can also cause a problem with the scalatest plugin (this was the case for him). It's worth attempting to run the tests of a fresh sample Scala project to test for this scenario before upgrading the IDE.

Answer 2

For anyone who has this problem even with newer version of IntelliJ, here is how I went about figuring out where the issue was. I pulled in the scalatest dependency at the top of the pom for the module I was trying to run tests in. Then an individual test would run without this error. I moved the dependency down the pom until the problem recurred to figure out which dependency was causing the problem. Then I found that the dependency had some really old dependencies including an older version of scalatest that weren't showing up in my dependency tree. Also, this jar dependency had scalatest as a dependency not marked with scope test.