3 files changed, 123 insertions, 18 deletions
diff --git a/scalajslib/test/src/mill/scalajslib/HelloJSWorldTests.scala b/scalajslib/test/src/mill/scalajslib/HelloJSWorldTests.scala
index 189e9634..d2cfc4da 100644
--- a/scalajslib/test/src/mill/scalajslib/HelloJSWorldTests.scala
+++ b/scalajslib/test/src/mill/scalajslib/HelloJSWorldTests.scala
@@ -1,8 +1,6 @@
 package mill.scalajslib
 
-import java.io.{FileReader, StringWriter}
 import java.util.jar.JarFile
-import javax.script.{ScriptContext, ScriptEngineManager}
 
 import ammonite.ops._
 import mill._
@@ -85,21 +83,6 @@ object HelloJSWorldTests extends TestSuite {
 
   val mainObject = helloWorldEvaluator.outPath / 'src / "Main.scala"
 
-  class Console {
-    val out = new StringWriter()
-    def log(s: String): Unit = out.append(s)
-  }
-
-  def runJS(path: Path): String = {
-    val engineManager = new ScriptEngineManager(null)
-    val engine = engineManager.getEngineByName("nashorn")
-    val console = new Console
-    val bindings = engine.getBindings(ScriptContext.ENGINE_SCOPE)
-    bindings.put("console", console)
-    engine.eval(new FileReader(path.toIO))
-    console.out.toString
-  }
-
   def tests: Tests = Tests {
     prepareWorkspace()
     'compile - {
@@ -136,7 +119,7 @@ object HelloJSWorldTests extends TestSuite {
         case FastOpt => HelloJSWorld.helloJsWorld(scalaVersion, scalaJSVersion).fastOpt
       }
       val Right((result, evalCount)) = helloWorldEvaluator(task)
-      val output = runJS(result.path)
+      val output = ScalaJsUtils.runJS(result.path)
       assert(output == "Hello Scala.js")
     }
 
diff --git a/scalajslib/test/src/mill/scalajslib/MultiModuleTests.scala b/scalajslib/test/src/mill/scalajslib/MultiModuleTests.scala
new file mode 100644
index 00000000..0f2df335
--- /dev/null
+++ b/scalajslib/test/src/mill/scalajslib/MultiModuleTests.scala
@@ -0,0 +1,99 @@
+package mill.scalajslib
+
+import ammonite.ops._
+import mill._
+import mill.define.Discover
+import mill.eval.Evaluator
+import mill.util._
+import mill.scalalib._
+import utest._
+
+object MultiModuleTests extends TestSuite {
+  val workspacePath =  TestUtil.getOutPathStatic() / "multi-module"
+  val sourcePath = pwd / 'scalajslib / 'test / 'resources / "multi-module"
+
+  object MultiModule extends TestUtil.BaseModule {
+    trait BaseModule extends ScalaJSModule {
+      def scalaVersion = "2.12.4"
+      def scalaJSVersion = "0.6.22"
+    }
+
+    object client extends BaseModule {
+      override def millSourcePath = workspacePath / 'client
+      override def moduleDeps = Seq(shared)
+      override def mainClass = Some("Main")
+      object test extends Tests {
+        def testFrameworks = Seq("utest.runner.Framework")
+        override def ivyDeps = Agg(ivy"com.lihaoyi::utest::0.6.3")
+      }
+    }
+
+    object shared extends BaseModule {
+      override def millSourcePath = workspacePath / 'shared
+    }
+
+    override def millDiscover = Discover[this.type]
+  }
+
+  val evaluator = TestEvaluator.static(MultiModule)
+
+  def tests: Tests = Tests {
+    prepareWorkspace()
+
+    def checkOpt(mode: OptimizeMode) = {
+      val task = mode match {
+        case FullOpt => MultiModule.client.fullOpt
+        case FastOpt => MultiModule.client.fastOpt
+      }
+      val Right((linked, evalCount)) = evaluator(task)
+
+      val runOutput = ScalaJsUtils.runJS(linked.path)
+      assert(
+        evalCount > 0,
+        runOutput == "Hello from Scala.js, result is: 3"
+      )
+    }
+
+    'fastOpt - checkOpt(FastOpt)
+    'fullOpt - checkOpt(FullOpt)
+
+    'test - {
+      val Right(((_, testResults), evalCount)) = evaluator(MultiModule.client.test.test())
+
+      assert(
+        evalCount > 0,
+        testResults.size == 3,
+        testResults.forall(_.status == "Success")
+      )
+    }
+
+    def checkRun(mainClass: Option[String] = None) = {
+      val command = mainClass match {
+        case Some(main) => MultiModule.client.runMain(main)
+        case None => MultiModule.client.run()
+      }
+      val Right((_, evalCount)) = evaluator(command)
+
+      val paths = Evaluator.resolveDestPaths(
+        evaluator.outPath,
+        command.ctx.segments
+      )
+      val log = read(paths.log)
+      assert(
+        evalCount > 0,
+        log.contains("node"),
+        log.contains("Hello from Scala.js, result is: 3")
+      )
+    }
+
+    'run - checkRun()
+    'runMain - checkRun(mainClass = Some("Main"))
+  }
+
+  def prepareWorkspace(): Unit = {
+    rm(workspacePath)
+    mkdir(workspacePath / up)
+    cp(sourcePath, workspacePath)
+  }
+
+}
diff --git a/scalajslib/test/src/mill/scalajslib/ScalaJsUtils.scala b/scalajslib/test/src/mill/scalajslib/ScalaJsUtils.scala
new file mode 100644
index 00000000..859d2d56
--- /dev/null
+++ b/scalajslib/test/src/mill/scalajslib/ScalaJsUtils.scala
@@ -0,0 +1,23 @@
+package mill.scalajslib
+
+import java.io.{FileReader, StringWriter}
+import javax.script.{ScriptContext, ScriptEngineManager}
+
+import ammonite.ops.Path
+
+object ScalaJsUtils {
+  def runJS(path: Path): String = {
+    val engineManager = new ScriptEngineManager(null)
+    val engine = engineManager.getEngineByName("nashorn")
+    val console = new Console
+    val bindings = engine.getBindings(ScriptContext.ENGINE_SCOPE)
+    bindings.put("console", console)
+    engine.eval(new FileReader(path.toIO))
+    console.out.toString
+  }
+}
+
+class Console {
+  val out = new StringWriter()
+  def log(s: String): Unit = out.append(s)
+}