1 files changed, 73 insertions, 0 deletions
diff --git a/test/junit/scala/tools/nsc/transform/delambdafy/DelambdafyTest.scala b/test/junit/scala/tools/nsc/transform/delambdafy/DelambdafyTest.scala
new file mode 100644
index 0000000000..010078e28a
--- /dev/null
+++ b/test/junit/scala/tools/nsc/transform/delambdafy/DelambdafyTest.scala
@@ -0,0 +1,73 @@
+package scala.tools.nsc.transform.delambdafy
+
+import scala.reflect.io.Path.jfile2path
+import scala.tools.nsc.backend.jvm.CodeGenTools.getGeneratedClassfiles
+import scala.tools.nsc.backend.jvm.CodeGenTools.makeSourceFile
+import scala.tools.nsc.backend.jvm.CodeGenTools.newCompilerWithoutVirtualOutdir
+import scala.tools.nsc.io.AbstractFile
+import scala.tools.testing.TempDir
+
+import org.junit.Assert.assertTrue
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.junit.runners.JUnit4
+
+@RunWith(classOf[JUnit4])
+class DelambdafyTest {
+  def compileToMultipleOutputWithDelamdbafyMethod(): List[(String, Array[Byte])] = {
+    val codeForMultiOutput = """
+object Delambdafy {
+  type -->[D, I] = PartialFunction[D, I]
+
+  def main(args: Array[String]): Unit = {
+    val result = List(1, 2, 4).map { a =>
+      val list = List("1", "2", "3").map { _ + "test" }
+      list.find { _ == a.toString + "test" }
+    }
+    println(result)
+    lazy val _foo = foo(result) {
+      case x :: xs if x isDefined => x.get.length
+      case _ => 0
+    }
+    println(_foo)
+    lazy val bar: Int => Int = {
+      case 2 => 23
+      case _ =>
+        val v = List(1).map { _ + 42 }.head
+        v + 31
+    }
+    bar(3)
+    lazy val _baz = baz {
+      case 1 =>
+        val local = List(1).map(_ + 1)
+        local.head
+    }
+  }
+
+  def baz[T](f: Any --> Any): Any => Any = f
+
+  def foo(b: List[Option[String]])(a: List[Option[String]] => Int): Int = a(b)
+}
+"""
+    val srcFile = makeSourceFile(codeForMultiOutput, "delambdafyTest.scala")
+    val outDir = AbstractFile.getDirectory(TempDir.createTempDir())
+    val outDirPath = outDir.canonicalPath
+    val extraArgs = "-Ybackend:GenBCode -Ydelambdafy:method"
+    val argsWithOutDir = extraArgs + s" -d $outDirPath -cp $outDirPath"
+    val compiler = newCompilerWithoutVirtualOutdir(extraArgs = argsWithOutDir)
+    compiler.settings.outputDirs.add(srcFile.file, outDir)
+
+    new compiler.Run().compileSources(List(srcFile))
+
+    val classfiles = getGeneratedClassfiles(outDir)
+    outDir.delete()
+    classfiles
+  }
+  
+  @Test
+  def shouldFindOutputFoldersForAllPromotedLambdasAsMethod(): Unit = {
+    val actual = compileToMultipleOutputWithDelamdbafyMethod()
+
+    assertTrue(actual.length > 0)
+  }
+}