diff --git a/build.sbt b/build.sbt
index f6b3739..892643f 100644
--- a/build.sbt
+++ b/build.sbt
@@ -10,6 +10,7 @@ val spinalIdslPlugin = compilerPlugin("com.github.spinalhdl" %% "spinalhdl-idsl-
 lazy val projectname = (project in file("."))
   .settings(
     Compile / scalaSource := baseDirectory.value / "hw" / "spinal",
+    Test / scalaSource := baseDirectory.value / "test" / "spinal",
     libraryDependencies ++= Seq(spinalCore, spinalLib, spinalIdslPlugin)
   )
 
diff --git a/hw/spinal/projectname/MyTopLevelFormal.scala b/test/spinal/projectname/MyTopLevelFormal.scala
similarity index 100%
rename from hw/spinal/projectname/MyTopLevelFormal.scala
rename to test/spinal/projectname/MyTopLevelFormal.scala
diff --git a/hw/spinal/projectname/MyTopLevelSim.scala b/test/spinal/projectname/MyTopLevelSim.scala
similarity index 100%
rename from hw/spinal/projectname/MyTopLevelSim.scala
rename to test/spinal/projectname/MyTopLevelSim.scala