Re-enable PluginCoverageScalaJsTest, fix dangling UndefinedParam bug

build.sbt

@@ -101,7 +101,8 @@ lazy val root = Project("scalac-scoverage", file("."))
     runtimeJSDOMTest,
     reporter,
     domain,
-    serializer
+    serializer,
+    buildInfo
   )
 
 lazy val runtime = CrossProject(
@@ -146,7 +147,8 @@ lazy val runtimeJSDOMTest =
 
 lazy val plugin =
   project
-    .dependsOn(runtimeJVM % Test)
+    // we need both runtimes compiled prior to running tests
+    .dependsOn(runtimeJVM % Test, runtimeJS % Test)
     .settings(
       name := "scalac-scoverage-plugin",
       crossTarget := target.value / s"scala-${scalaVersion.value}",
@@ -158,7 +160,7 @@ lazy val plugin =
     .settings(
       Test / unmanagedSourceDirectories += (Test / sourceDirectory).value / "scala-2.12+"
     )
-    .dependsOn(domain, reporter % "test->compile", serializer)
+    .dependsOn(domain, reporter % "test->compile", serializer, buildInfo % Test)
 
 lazy val reporter =
   project
@@ -179,6 +181,16 @@ lazy val reporter =
     )
     .dependsOn(domain, serializer)
 
+lazy val buildInfo =
+  project
+    .settings(
+      crossScalaVersions := bin212 ++ bin213,
+      buildInfoKeys += BuildInfoKey("scalaJSVersion", scalaJSVersion),
+      publishArtifact := false,
+      publishLocal := {}
+    )
+    .enablePlugins(BuildInfoPlugin)
+
 lazy val domain =
   project
     .settings(

plugin/src/main/scala/scoverage/ScoveragePlugin.scala

@@ -10,6 +10,7 @@ import scala.tools.nsc.plugins.Plugin
 import scala.tools.nsc.plugins.PluginComponent
 import scala.tools.nsc.transform.Transform
 import scala.tools.nsc.transform.TypingTransformers
+import scala.util.control.NonFatal
 
 import scoverage.domain.Coverage
 import scoverage.domain.Statement
@@ -98,11 +99,11 @@ class ScoverageInstrumentationComponent(
   private var options: ScoverageOptions = ScoverageOptions.default()
   private var coverageFilter: CoverageFilter = AllCoverageFilter
 
-  private val isScalaJsEnabled: Boolean = {
+  private lazy val isScalaJsEnabled: Boolean = {
     try {
       rootMirror.getClassIfDefined("scala.scalajs.js.Any") != NoSymbol
     } catch {
-      case _: Throwable => false
+      case NonFatal(_) => false
     }
   }
 

plugin/src/test/scala/scoverage/PluginCoverageScalaJsTest.scala

@@ -6,8 +6,8 @@ import munit.FunSuite
   */
 class PluginCoverageScalaJsTest extends FunSuite with MacroSupport {
 
-  test("scoverage should ignore default undefined parameter".ignore) {
-    val compiler = ScoverageCompiler.default
+  test("scoverage should ignore default undefined parameter") {
+    val compiler = ScoverageCompiler.defaultJS
     compiler.compileCodeSnippet(
       """import scala.scalajs.js
         |
@@ -16,6 +16,6 @@ class PluginCoverageScalaJsTest extends FunSuite with MacroSupport {
         |}""".stripMargin
     )
     assert(!compiler.reporter.hasErrors)
-    compiler.assertNMeasuredStatements(4)
+    compiler.assertNMeasuredStatements(2)
   }
 }

plugin/src/test/scala/scoverage/ScoverageCompiler.scala

@@ -11,6 +11,7 @@ import scala.tools.nsc.plugins.PluginComponent
 import scala.tools.nsc.transform.Transform
 import scala.tools.nsc.transform.TypingTransformers
 
+import buildinfo.BuildInfo
 import scoverage.reporter.IOUtils
 
 private[scoverage] object ScoverageCompiler {
@@ -24,9 +25,22 @@ private[scoverage] object ScoverageCompiler {
   def classPath: Seq[String] =
     getScalaJars.map(
       _.getAbsolutePath
-    ) :+ sbtCompileDir.getAbsolutePath :+ runtimeClasses.getAbsolutePath
+    ) :+ sbtCompileDir.getAbsolutePath :+ runtimeClasses("jvm").getAbsolutePath
 
-  def settings: Settings = {
+  def jsClassPath: Seq[String] =
+    getScalaJsJars.map(
+      _.getAbsolutePath
+    ) :+ sbtCompileDir.getAbsolutePath :+ runtimeClasses("js").getAbsolutePath
+
+  def settings: Settings = settings(classPath)
+
+  def jsSettings: Settings = {
+    val s = settings(jsClassPath)
+    s.plugin.value = List(getScalaJsCompilerJar.getAbsolutePath)
+    s
+  }
+
+  def settings(classPath: Seq[String]): Settings = {
     val s = new scala.tools.nsc.Settings
     s.Xprint.value = List("all", "_")
     s.deprecation.value = true
@@ -46,6 +60,11 @@ private[scoverage] object ScoverageCompiler {
     new ScoverageCompiler(settings, reporter)
   }
 
+  def defaultJS: ScoverageCompiler = {
+    val reporter = new scala.tools.nsc.reporters.ConsoleReporter(jsSettings)
+    new ScoverageCompiler(jsSettings, reporter)
+  }
+
   def locationCompiler: LocationCompiler = {
     val reporter = new scala.tools.nsc.reporters.ConsoleReporter(settings)
     new LocationCompiler(settings, reporter)
@@ -56,6 +75,19 @@ private[scoverage] object ScoverageCompiler {
     scalaJars.map(findScalaJar)
   }
 
+  private def getScalaJsJars: List[File] =
+    findJar(
+      "org.scala-js",
+      s"scalajs-library_$ShortScalaVersion",
+      BuildInfo.scalaJSVersion
+    ) :: getScalaJars
+
+  private def getScalaJsCompilerJar: File = findJar(
+    "org.scala-js",
+    s"scalajs-compiler_$ScalaVersion",
+    BuildInfo.scalaJSVersion
+  )
+
   private def sbtCompileDir: File = {
     val dir = new File(
       s"./plugin/target/scala-$ScalaVersion/classes"
@@ -67,20 +99,28 @@ private[scoverage] object ScoverageCompiler {
     dir
   }
 
-  private def runtimeClasses: File = new File(
-    s"./runtime/jvm/target/scala-$ScalaVersion/classes"
+  private def runtimeClasses(platform: String): File = new File(
+    s"./runtime/$platform/target/scala-$ScalaVersion/classes"
   )
 
   private def findScalaJar(artifactId: String): File =
-    findIvyJar("org.scala-lang", artifactId, ScalaVersion)
-      .orElse(findCoursierJar(artifactId, ScalaVersion))
+    findJar("org.scala-lang", artifactId, ScalaVersion)
+
+  private def findJar(
+      groupId: String,
+      artifactId: String,
+      version: String
+  ): File =
+    findIvyJar(groupId, artifactId, version)
+      .orElse(findCoursierJar(groupId, artifactId, version))
       .getOrElse {
         throw new FileNotFoundException(
-          s"Could not locate $artifactId/$ScalaVersion"
+          s"Could not locate $groupId:$artifactId:$version"
         )
       }
 
   private def findCoursierJar(
+      groupId: String,
       artifactId: String,
       version: String
   ): Option[File] = {
@@ -89,9 +129,10 @@ private[scoverage] object ScoverageCompiler {
       ".cache/coursier", // Linux
       "Library/Caches/Coursier", // MacOSX
       "AppData/Local/Coursier/cache" // Windows
-    ).map(loc =>
-      s"$userHome/$loc/v1/https/repo1.maven.org/maven2/org/scala-lang/$artifactId/$version/$artifactId-$version.jar"
-    )
+    ).map { loc =>
+      val gid = groupId.replace('.', '/')
+      s"$userHome/$loc/v1/https/repo1.maven.org/maven2/$gid/$artifactId/$version/$artifactId-$version.jar"
+    }
     jarPaths.map(new File(_)).find(_.exists())
   }
 

project/plugins.sbt

@@ -6,4 +6,6 @@ addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.4.6")
 
 addSbtPlugin("ch.epfl.scala" % "sbt-scalafix" % "0.9.33")
 
+addSbtPlugin("com.eed3si9n" % "sbt-buildinfo" % "0.11.0")
+
 libraryDependencies += "org.scala-js" %% "scalajs-env-jsdom-nodejs" % "1.1.0"