Merge pull request sbt#6806 from eed3si9n/wip/test_framework

[1.6.x] Throw when test framework cannot be loaded due to MatchError or NoClassDefFoundError

build.sbt

@@ -10,7 +10,7 @@ import scala.util.Try
 // ThisBuild settings take lower precedence,
 // but can be shared across the multi projects.
 ThisBuild / version := {
-  val v = "1.6.0-SNAPSHOT"
+  val v = "1.6.2-SNAPSHOT"
   nightlyVersion.getOrElse(v)
 }
 ThisBuild / version2_13 := "2.0.0-SNAPSHOT"

sbt

@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
 
 set +e
-declare builtin_sbt_version="1.6.0"
+declare builtin_sbt_version="1.6.1"
 declare -a residual_args
 declare -a java_args
 declare -a scalac_args

testing/src/main/scala/sbt/TestFramework.scala

@@ -49,12 +49,14 @@ final class TestFramework(val implClassNames: String*) extends Serializable {
   ): Option[Framework] = {
     def logError(e: Throwable): Option[Framework] = {
       log.error(
-        s"Error loading test framework ($e). This usually means that you are"
-          + " using a layered class loader that cannot reach the sbt.testing.Framework class."
-          + " The most likely cause is that your project has a runtime dependency on your"
-          + " test framework, e.g. scalatest. To fix this, you can try to set\n"
-          + "Test / classLoaderLayeringStrategy := ClassLoaderLayeringStrategy.ScalaLibrary\nor\n"
-          + "Test / classLoaderLayeringStrategy := ClassLoaderLayeringStrategy.Flat"
+        s"""Error loading test framework ($e).
+           |This often means that you are using a layered class loader that cannot reach the sbt.testing.Framework class.
+           |The most likely cause is that your project has a runtime dependency on your
+           |test framework, e.g. ScalaTest. To fix this, you can try to set
+           |
+           |    Test / classLoaderLayeringStrategy := ClassLoaderLayeringStrategy.ScalaLibrary
+           |or
+           |    Test / classLoaderLayeringStrategy := ClassLoaderLayeringStrategy.Flat""".stripMargin
       )
       None
     }
@@ -66,8 +68,12 @@ final class TestFramework(val implClassNames: String*) extends Serializable {
             case oldFramework: OldFramework => new FrameworkWrapper(oldFramework)
           })
         } catch {
-          case e: NoClassDefFoundError => logError(e)
-          case e: MatchError           => logError(e)
+          case e: NoClassDefFoundError =>
+            logError(e)
+            throw e
+          case e: MatchError =>
+            logError(e)
+            throw e
           case _: ClassNotFoundException =>
             log.debug("Framework implementation '" + head + "' not present.")
             createFramework(loader, log, tail)