Reproduce #5308

#5308

sbt/src/sbt-test/tests/scalatest/build.sbt

@@ -0,0 +1,12 @@
+ThisBuild / scalaVersion     := "2.13.1"
+ThisBuild / version          := "0.1.0-SNAPSHOT"
+ThisBuild / organization     := "com.example"
+ThisBuild / organizationName := "example"
+
+lazy val root = (project in file("."))
+  .settings(
+    name := "sbt-5308",
+    libraryDependencies += "org.scalatest" %% "scalatest" % "3.1.0" % Test,
+    libraryDependencies += "com.vladsch.flexmark" % "flexmark-all" % "0.35.10" % Test,
+    Test / testOptions += Tests.Argument(TestFrameworks.ScalaTest, "-h", "target/generated/test-reports"),
+  )

sbt/src/sbt-test/tests/scalatest/src/test/scala/example/HelloSpec.scala

@@ -0,0 +1,9 @@
+package example
+
+import org.scalatest._
+
+class HelloSpec extends FlatSpec with Matchers {
+  "hello" should "say hello" in {
+    assert("hello" == "hello")
+  }
+}

sbt/src/sbt-test/tests/scalatest/test

@@ -0,0 +1 @@
+> test

scripted-sbt-redux/src/main/scala/sbt/scriptedtest/ScriptedTests.scala

@@ -248,7 +248,8 @@ final class ScriptedTests(
         LauncherBased // there is an issue with jansi and coursier
       case "watch/commands" =>
         LauncherBased // java.lang.ClassNotFoundException: javax.tools.DiagnosticListener when run with java 11 and an old sbt launcher
-      case "watch/managed" => LauncherBased // sbt/Package$
+      case "watch/managed"   => LauncherBased // sbt/Package$
+      case "tests/scalatest" => LauncherBased
       case "tests/test-cross" =>
         LauncherBased // the sbt metabuild classpath leaks into the test interface classloader in older versions of sbt
       case _ => RunFromSourceBased