Add test folder

build.sbt

@@ -1,8 +1,8 @@
 ThisBuild / version := "1.0"
-ThisBuild / scalaVersion := "2.13.14"
+ThisBuild / scalaVersion := "2.12.18"
 ThisBuild / organization := "org.example"
 
-val spinalVersion = "1.10.2a"
+val spinalVersion = "1.9.4"
 val spinalCore = "com.github.spinalhdl" %% "spinalhdl-core" % spinalVersion
 val spinalLib = "com.github.spinalhdl" %% "spinalhdl-lib" % spinalVersion
 val spinalIdslPlugin = compilerPlugin("com.github.spinalhdl" %% "spinalhdl-idsl-plugin" % spinalVersion)
@@ -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)
   )
 

build.sc

@@ -1,9 +1,9 @@
 import mill._, scalalib._
 
-val spinalVersion = "1.10.2a"
+val spinalVersion = "1.9.0"
 
 object projectname extends SbtModule {
-  def scalaVersion = "2.13.14"
+  def scalaVersion = "2.12.16"
   override def millSourcePath = os.pwd
   def sources = T.sources(
     millSourcePath / "hw" / "spinal"