Move JUnit Plugin to the test scope

Author: lolgab

build.sbt

@@ -167,7 +167,23 @@ lazy val xml = crossProject(JSPlatform, JVMPlatform, NativePlatform)
     scalaModuleMimaPreviousVersion := None, // No such release yet
     // Scala Native cannot run forked tests
     Test / fork := false,
-    libraryDependencies += "org.scala-native" %%% "junit-runtime" % nativeVersion,
-    addCompilerPlugin("org.scala-native" % "junit-plugin" % nativeVersion cross CrossVersion.full),
+    libraryDependencies += "org.scala-native" %%% "junit-runtime" % nativeVersion % Test,
+    Test / scalacOptions += {
+      val log = streams.value.log
+      val retrieveDir = baseDirectory.value / "scala-native-junit-plugin-jars"
+      val lm = dependencyResolution.value
+      val cp = lm
+        .retrieve(
+          "org.scala-native" % s"junit-plugin_${scalaVersion.value}" % nativeVersion,
+          scalaModuleInfo = None,
+          retrieveDir,
+          log
+        )
+        .fold(w => throw w.resolveException, identity(_))
+      val jarPath = cp
+        .find(_.toString.contains(s"/org/scala-native/junit-plugin_${scalaVersion.value}/$nativeVersion/junit-plugin_${scalaVersion.value}-$nativeVersion.jar"))
+        .getOrElse(throw new Exception("Can't find Scala Native junit-plugin jar"))
+      s"-Xplugin:$jarPath"
+    },
     Test / testOptions += Tests.Argument(TestFrameworks.JUnit, "-a", "-s", "-v")
   )