Expose rootCause util

munit/js/src/main/scala/munit/internal/PlatformCompat.scala

@@ -75,8 +75,4 @@ object PlatformCompat {
   private var myClassLoader: ClassLoader = _
   def setThisClassLoader(loader: ClassLoader): Unit = myClassLoader = loader
   def getThisClassLoader: ClassLoader = myClassLoader
-
-  type InvocationTargetException = munit.internal.InvocationTargetException
-  type UndeclaredThrowableException =
-    munit.internal.UndeclaredThrowableException
 }

munit/jvm/src/main/scala/munit/internal/PlatformCompat.scala

@@ -69,8 +69,4 @@ object PlatformCompat {
   def isJS: Boolean = false
   def isNative: Boolean = false
   def getThisClassLoader: ClassLoader = this.getClass().getClassLoader()
-
-  type InvocationTargetException = java.lang.reflect.InvocationTargetException
-  type UndeclaredThrowableException =
-    java.lang.reflect.UndeclaredThrowableException
 }

munit/native/src/main/scala/munit/internal/PlatformCompat.scala

@@ -56,8 +56,4 @@ object PlatformCompat {
   private var myClassLoader: ClassLoader = _
   def setThisClassLoader(loader: ClassLoader): Unit = myClassLoader = loader
   def getThisClassLoader: ClassLoader = myClassLoader
-
-  type InvocationTargetException = java.lang.reflect.InvocationTargetException
-  type UndeclaredThrowableException =
-    java.lang.reflect.UndeclaredThrowableException
 }

munit/shared/src/main/scala/munit/MUnitRunner.scala

@@ -1,9 +1,7 @@
 package munit
 
 import munit.internal.FutureCompat._
-import munit.internal.PlatformCompat.InvocationTargetException
 import munit.internal.PlatformCompat
-import munit.internal.PlatformCompat.UndeclaredThrowableException
 import munit.internal.console.Printers
 import munit.internal.console.StackTraces
 import munit.internal.junitinterface.Configurable
@@ -18,6 +16,7 @@ import org.junit.runner.notification.RunNotifier
 
 import java.lang.reflect.Modifier
 import java.util.concurrent.ExecutionException
+import scala.annotation.tailrec
 import scala.collection.mutable
 import scala.concurrent.Await
 import scala.concurrent.ExecutionContext
@@ -293,7 +292,7 @@ class MUnitRunner(val cls: Class[_ <: Suite], newInstance: () => Suite)
         Future.successful(())
       case NonFatal(ex) =>
         trimStackTrace(ex)
-        val cause = rootCause(ex)
+        val cause = MUnitRunner.rootCause(ex)
         val failure = new Failure(description, cause)
         cause match {
           case _: AssumptionViolatedException =>
@@ -315,16 +314,6 @@ class MUnitRunner(val cls: Class[_ <: Suite], newInstance: () => Suite)
     }
   }
 
-  // NOTE(olafur): these exceptions appear when we await on futures. We unwrap
-  // these exception in order to provide more helpful error messages.
-  private def rootCause(x: Throwable): Throwable = x match {
-    case _: InvocationTargetException | _: ExceptionInInitializerError |
-        _: UndeclaredThrowableException | _: ExecutionException
-        if x.getCause != null =>
-      rootCause(x.getCause)
-    case _ => x
-  }
-
   private def futureFromAny(any: Any): Future[Any] = any match {
     case f: Future[_] => f
     case _            => Future.successful(any)
@@ -428,7 +417,9 @@ class MUnitRunner(val cls: Class[_ <: Suite], newInstance: () => Suite)
     val description = createTestDescription(test)
     notifier.fireTestStarted(description)
     trimStackTrace(ex)
-    notifier.fireTestFailure(new Failure(description, rootCause(ex)))
+    notifier.fireTestFailure(
+      new Failure(description, MUnitRunner.rootCause(ex))
+    )
     notifier.fireTestFinished(description)
   }
   private def trimStackTrace(ex: Throwable): Unit = {
@@ -465,4 +456,16 @@ object MUnitRunner {
       case nsme: NoSuchMethodException => false
     }
   }
+
+  // NOTE(olafur): these exceptions appear when we await on futures. We unwrap
+  // these exception in order to provide more helpful error messages.
+  // NOTE(valencik): preserve binary compatibility as this util is used in
+  // downstream integration libraries.
+  @tailrec
+  private[munit] def rootCause(x: Throwable): Throwable = x match {
+    case _: ExceptionInInitializerError | _: ExecutionException
+        if x.getCause != null =>
+      rootCause(x.getCause)
+    case _ => x
+  }
 }