Add webworker test

build.sbt

@@ -155,5 +155,5 @@ lazy val webworker = project
     ),
     (Test / test) := (Test / test).dependsOn(Compile / fastOptJS).value,
     buildInfoKeys := Seq[BuildInfoKey](scalaVersion, baseDirectory),
-    buildInfoPackage := "org.scalajs")
+    buildInfoPackage := "org.scalajs.macrotaskexecutor")
   .enablePlugins(ScalaJSPlugin, BuildInfoPlugin, NoPublishPlugin)

webworker/src/main/scala/org/scalajs/macrotaskexecutor/WebworkerSuiteRunner.scala → webworker/src/main/scala/java/io/File.scala

@@ -14,8 +14,9 @@
  * limitations under the License.
  */
 
-package org.scalajs.macrotaskexecutor
+package java.io
 
-object WebworkerSuiteRunner {
-  def main(args: Array[String]): Unit = ()
+// hack hack buildinfo hack
+class File(path: String) {
+  override def toString() = path
 }

webworker/src/main/scala/org/scalajs/macrotaskexecutor/MacrotaskExecutorSuiteRunner.scala

@@ -0,0 +1,51 @@
+/*
+ * Copyright 2021 Scala.js (https://www.scala-js.org/)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.scalajs.macrotaskexecutor
+
+import munit.MUnitRunner
+import org.junit.runner.Description
+import org.junit.runner.notification.Failure
+import org.junit.runner.notification.RunNotifier
+import org.scalajs.dom.webworkers.DedicatedWorkerGlobalScope
+
+import scala.scalajs.js
+import scala.util
+
+object MacrotaskExecutorSuiteRunner {
+
+  import MacrotaskExecutor.Implicits._
+
+  def postMessage(msg: js.Any): Unit =
+    DedicatedWorkerGlobalScope.self.postMessage(msg)
+
+  def main(args: Array[String]): Unit =
+    new MUnitRunner(
+      classOf[MacrotaskExecutorSuite],
+      () => new MacrotaskExecutorSuite
+    ).runAsync(new RunNotifier {
+      def fireTestStarted(description: Description): Unit = ()
+      def fireTestSuiteStarted(description: Description): Unit = ()
+      def fireTestSuiteFinished(description: Description): Unit = ()
+      def fireTestIgnored(description: Description): Unit = ()
+      def fireTestFinished(description: Description): Unit = ()
+      def fireTestFailure(failure: Failure): Unit = ()
+      def fireTestAssumptionFailed(failure: Failure): Unit = ()
+    }).onComplete {
+      case util.Success(_) => postMessage(true)
+      case util.Failure(_) => postMessage(false)
+    }
+}

webworker/src/test/scala/org/scalajs/macrotaskexecutor/WebWorkerMacrotaskSuite.scala

@@ -0,0 +1,57 @@
+/*
+ * Copyright 2021 Scala.js (https://www.scala-js.org/)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.scalajs.macrotaskexecutor
+
+import munit.FunSuite
+import org.scalajs.dom.webworkers.Worker
+
+import scala.concurrent.Promise
+import scala.scalajs.js
+import scala.util.Try
+
+class WebWorkerMacrotaskSuite extends FunSuite {
+
+  import MacrotaskExecutor.Implicits._
+
+  def scalaVersion = if (BuildInfo.scalaVersion.startsWith("2"))
+    BuildInfo.scalaVersion.split("\\.").init.mkString(".")
+  else
+    BuildInfo.scalaVersion
+
+  def targetDir = s"${BuildInfo.baseDirectory}/target/scala-${scalaVersion}"
+
+  Try(js.isUndefined(js.Dynamic.global.window.Worker)).toOption
+    .filterNot(identity)
+    .foreach { _ =>
+      test("macrotask executor should pass the suite on a webworker") {
+        val p = Promise[Boolean]()
+
+        val worker = new Worker(s"file://${targetDir}/scala-js-macrotask-executor-webworker-fastopt/main.js")
+
+        worker.onmessage = { event =>
+          event.data match {
+            case log: String      => println(log)
+            case success: Boolean => p.success(success)
+            case _                => ()
+          }
+        }
+
+        p.future.map(assert(_))
+
+      }
+    }
+}