Scala tests have broken

Test Suite Aborted
Exception encountered when invoking run on a nested suite - Unable to load a Suite class that was discovered in the runpath: NegativeValues
Stack Trace

java.lang.RuntimeException: Unable to load a Suite class that was discovered in the runpath: NegativeValues 
	at org.scalatest.tools.DiscoverySuite$.getSuiteInstance(DiscoverySuite.scala:81)
	at org.scalatest.tools.DiscoverySuite.$anonfun$nestedSuites$1(DiscoverySuite.scala:38)
	at scala.collection.StrictOptimizedIterableOps.map(StrictOptimizedIterableOps.scala:100)
	at scala.collection.StrictOptimizedIterableOps.map$(StrictOptimizedIterableOps.scala:87)
	at scala.collection.immutable.Vector.map(Vector.scala:113)
	at org.scalatest.tools.DiscoverySuite.<init>(DiscoverySuite.scala:37)
	at org.scalatest.tools.Runner$.genDiscoSuites$1(Runner.scala:1168)
	at org.scalatest.tools.Runner$.doRunRunRunDaDoRunRun(Runner.scala:1253)
	at org.scalatest.tools.Runner$.$anonfun$runOptionallyWithPassFailReporter$24(Runner.scala:1033)
	at org.scalatest.tools.Runner$.$anonfun$runOptionallyWithPassFailReporter$24$adapted(Runner.scala:1011)
	at org.scalatest.tools.Runner$.withClassLoaderAndDispatchReporter(Runner.scala:1509)
	at org.scalatest.tools.Runner$.runOptionallyWithPassFailReporter(Runner.scala:1011)
	at org.scalatest.tools.Runner$.main(Runner.scala:827)
	at org.scalatest.tools.Runner.main(Runner.scala)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at scala.reflect.internal.util.ScalaClassLoader.$anonfun$run$2(ScalaClassLoader.scala:105)
	at scala.reflect.internal.util.ScalaClassLoader.asContext(ScalaClassLoader.scala:40)
	at scala.reflect.internal.util.ScalaClassLoader.asContext$(ScalaClassLoader.scala:37)
	at scala.reflect.internal.util.ScalaClassLoader$URLClassLoader.asContext(ScalaClassLoader.scala:130)
	at scala.reflect.internal.util.ScalaClassLoader.run(ScalaClassLoader.scala:105)
	at scala.reflect.internal.util.ScalaClassLoader.run$(ScalaClassLoader.scala:97)
	at scala.reflect.internal.util.ScalaClassLoader$URLClassLoader.run(ScalaClassLoader.scala:130)
	at scala.tools.nsc.CommonRunner.run(ObjectRunner.scala:29)
	at scala.tools.nsc.CommonRunner.run$(ObjectRunner.scala:28)
	at scala.tools.nsc.ObjectRunner$.run(ObjectRunner.scala:44)
	at scala.tools.nsc.CommonRunner.runAndCatch(ObjectRunner.scala:35)
	at scala.tools.nsc.CommonRunner.runAndCatch$(ObjectRunner.scala:34)
	at scala.tools.nsc.MainGenericRunner.runTarget$1(MainGenericRunner.scala:70)
	at scala.tools.nsc.MainGenericRunner.run$1(MainGenericRunner.scala:91)
	at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:102)
	at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:107)
	at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)
Caused by: org.scalatest.exceptions.DuplicateTestNameException: Duplicate test name: fib(-96) should return -51680708854858323072
	at org.scalatest.SuperEngine.registerTest(Engine.scala:657)
	at org.scalatest.FlatSpecLike.org$scalatest$FlatSpecLike$$registerTestToRun(FlatSpecLike.scala:143)
	at org.scalatest.FlatSpecLike$InAndIgnoreMethods.in(FlatSpecLike.scala:1398)
	at NegativeValues.$anonfun$new$10(fixture.scala:70)
	at scala.collection.immutable.Range.foreach$mVc$sp(Range.scala:190)
	at NegativeValues.<init>(fixture.scala:66)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
	at java.lang.Class.newInstance(Class.java:442)
	at org.scalatest.tools.DiscoverySuite$.getSuiteInstance(DiscoverySuite.scala:66)
	... 34 more