title: sbt test gives: java.lang.NoClassDefFoundError: scala/collection/GenTraversableOnce$class"
body: <p>When I run 'sbt test' I get:
  "[error] (test:executeTests) java.lang.NoClassDefFoundError: scala/collection/GenTraversableOnce$class"</p>
  
  <p>I'm guessing that I'm running with a particular Scala version and ScalaTest is expecting a different Scala version. However why this happens, I don't know! I think I'm running with Scala 2.11 and that this is also with ScalaTest should be expecting.</p>
  
  <p>Of interest might be that I'm not actually using ScalaTest. I'm only using JUnit tests.</p>
  
  <p>The project can be found <a href="https://github.com/keyboardDrummer/ParticleCompiler" rel="nofollow">on GitHub</a>.
  I'm using this sbt file:</p>
  
  <pre><code>name := "ParticleCompilerSbt"    
  version := "1.0"    
  scalaVersion := "2.11.8"
  
  libraryDependencies += "com.fifesoft" % "rsyntaxtextarea" % "2.5.8"    
  libraryDependencies += "org.swinglabs" % "swingx" % "1.6.1"    
  libraryDependencies += "jgraph" % "jgraph" % "5.13.0.0"    
  libraryDependencies += "org.tinyjee.jgraphx" % "jgraphx" % "2.3.0.5"    
  libraryDependencies += "org.jgrapht" % "jgrapht-core" % "0.9.1"    
  libraryDependencies += "org.scalatest" % "scalatest_2.11" % "3.0.0" % "test"    
  libraryDependencies += "junit" % "junit" % "4.12" % "test"    
  libraryDependencies += "com.novocode" % "junit-interface" % "0.11" % "test"    
  libraryDependencies += "org.scala-lang" % "scala-compiler" % "2.11.8"    
  libraryDependencies += "org.scala-lang.modules" % "scala-xml_2.11" % "1.0.5"    
  libraryDependencies += "org.scala-lang.modules" % "scala-swing_2.11" % "2.0.0-M2"    
  libraryDependencies += "org.scala-lang.modules" % "scala-parser-combinators_2.11" % "1.0.4"    
  libraryDependencies += "org.apache.commons" % "commons-math3" % "3.5"    
  libraryDependencies += "com.google.guava" % "guava" % "18.0"
  libraryDependencies += "com.typesafe.akka" % "akka-actor_2.10" % "2.1.3"
  unmanagedResourceDirectories in Compile += baseDirectory.value / "testResources"
  </code></pre>
  
  <p>'sbt test' gives the following stacktrace:</p>
  
  <pre><code>java.lang.NoClassDefFoundError: scala/collection/GenTraversableOnce$class
          at org.scalatest.ConfigMap.&lt;init&gt;(ConfigMap.scala:97)
          at org.scalatest.tools.Runner$.parsePropertiesArgsIntoMap(Runner.scala:2219)
          at org.scalatest.tools.Framework.runner(Framework.scala:1026)
          at sbt.Defaults$$anonfun$createTestRunners$1.apply(Defaults.scala:547)
          at sbt.Defaults$$anonfun$createTestRunners$1.apply(Defaults.scala:541)
          at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)
          at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)
          at scala.collection.immutable.Map$Map2.foreach(Map.scala:130)
          at scala.collection.TraversableLike$class.map(TraversableLike.scala:244)
          at scala.collection.AbstractTraversable.map(Traversable.scala:105)
          at sbt.Defaults$.createTestRunners(Defaults.scala:541)
          at sbt.Defaults$.allTestGroupsTask(Defaults.scala:561)
          at sbt.Defaults$$anonfun$testTasks$4.apply(Defaults.scala:424)
          at sbt.Defaults$$anonfun$testTasks$4.apply(Defaults.scala:424)
          at scala.Function9$$anonfun$tupled$1.apply(Function9.scala:35)
          at scala.Function9$$anonfun$tupled$1.apply(Function9.scala:34)
          at scala.Function1$$anonfun$compose$1.apply(Function1.scala:47)
          at sbt.$tilde$greater$$anonfun$$u2219$1.apply(TypeFunctions.scala:40)
          at sbt.std.Transform$$anon$4.work(System.scala:63)
          at sbt.Execute$$anonfun$submit$1$$anonfun$apply$1.apply(Execute.scala:228)
          at sbt.Execute$$anonfun$submit$1$$anonfun$apply$1.apply(Execute.scala:228)
          at sbt.ErrorHandling$.wideConvert(ErrorHandling.scala:17)
          at sbt.Execute.work(Execute.scala:237)
          at sbt.Execute$$anonfun$submit$1.apply(Execute.scala:228)
          at sbt.Execute$$anonfun$submit$1.apply(Execute.scala:228)
          at sbt.ConcurrentRestrictions$$anon$4$$anonfun$1.apply(ConcurrentRestrictions.scala:159)
          at sbt.CompletionService$$anon$2.call(CompletionService.scala:28)
          at java.util.concurrent.FutureTask.run(Unknown Source)
          at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
          at java.util.concurrent.FutureTask.run(Unknown Source)
          at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
          at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
          at java.lang.Thread.run(Unknown Source)
  Caused by: java.lang.ClassNotFoundException: scala.collection.GenTraversableOnce$class
          at java.net.URLClassLoader.findClass(Unknown Source)
          at java.lang.ClassLoader.loadClass(Unknown Source)
          at java.lang.ClassLoader.loadClass(Unknown Source)
          at org.scalatest.ConfigMap.&lt;init&gt;(ConfigMap.scala:97)
          at org.scalatest.tools.Runner$.parsePropertiesArgsIntoMap(Runner.scala:2219)
          at org.scalatest.tools.Framework.runner(Framework.scala:1026)
          at sbt.Defaults$$anonfun$createTestRunners$1.apply(Defaults.scala:547)
          at sbt.Defaults$$anonfun$createTestRunners$1.apply(Defaults.scala:541)
          at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)
          at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)
          at scala.collection.immutable.Map$Map2.foreach(Map.scala:130)
          at scala.collection.TraversableLike$class.map(TraversableLike.scala:244)
          at scala.collection.AbstractTraversable.map(Traversable.scala:105)
          at sbt.Defaults$.createTestRunners(Defaults.scala:541)
          at sbt.Defaults$.allTestGroupsTask(Defaults.scala:561)
          at sbt.Defaults$$anonfun$testTasks$4.apply(Defaults.scala:424)
          at sbt.Defaults$$anonfun$testTasks$4.apply(Defaults.scala:424)
          at scala.Function9$$anonfun$tupled$1.apply(Function9.scala:35)
          at scala.Function9$$anonfun$tupled$1.apply(Function9.scala:34)
          at scala.Function1$$anonfun$compose$1.apply(Function1.scala:47)
          at sbt.$tilde$greater$$anonfun$$u2219$1.apply(TypeFunctions.scala:40)
          at sbt.std.Transform$$anon$4.work(System.scala:63)
          at sbt.Execute$$anonfun$submit$1$$anonfun$apply$1.apply(Execute.scala:228)
          at sbt.Execute$$anonfun$submit$1$$anonfun$apply$1.apply(Execute.scala:228)
          at sbt.ErrorHandling$.wideConvert(ErrorHandling.scala:17)
          at sbt.Execute.work(Execute.scala:237)
          at sbt.Execute$$anonfun$submit$1.apply(Execute.scala:228)
          at sbt.Execute$$anonfun$submit$1.apply(Execute.scala:228)
          at sbt.ConcurrentRestrictions$$anon$4$$anonfun$1.apply(ConcurrentRestrictions.scala:159)
          at sbt.CompletionService$$anon$2.call(CompletionService.scala:28)
          at java.util.concurrent.FutureTask.run(Unknown Source)
          at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
          at java.util.concurrent.FutureTask.run(Unknown Source)
          at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
          at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
          at java.lang.Thread.run(Unknown Source)
  </code></pre>
  
  <p>I've been stuck with this for a while so thanks for helping!</p>