Adds parallel testing

build.sc

@@ -14,28 +14,34 @@ import mill.bsp._
 // See: https://github.com/com-lihaoyi/mill/issues/3840
 
 object `TPchisel` extends SbtModule { m =>
-  override def millSourcePath = super.millSourcePath / os.up
-  override def scalaVersion = "2.13.16"
-  override def scalacOptions = Seq(
-    "-language:reflectiveCalls",
-    "-deprecation",
-    "-feature",
-    "-Xcheckinit",
-    "-Ymacro-annotations",
-    "-unchecked",
-	"-Xfatal-warnings", 
-	"-Ywarn-dead-code", 
-	"-Ywarn-unused" 
-  )
-  override def ivyDeps = Agg(
-    ivy"org.chipsalliance::chisel:7.2.0",
-  )
-  override def scalacPluginIvyDeps = Agg(
-    ivy"org.chipsalliance:::chisel-plugin:7.2.0",
-  )
-  object test extends SbtTests with TestModule.ScalaTest {
-    override def ivyDeps = m.ivyDeps() ++ Agg(
-      ivy"org.scalatest::scalatest::3.2.19"
+    override def millSourcePath = super.millSourcePath / os.up
+    override def scalaVersion = "2.13.16"
+    override def scalacOptions = Seq(
+        "-language:reflectiveCalls",
+        "-deprecation",
+        "-feature",
+        "-Xcheckinit",
+        "-Ymacro-annotations",
+        "-unchecked",
+        "-Xfatal-warnings",
+        "-Ywarn-dead-code",
+        "-Ywarn-unused"
     )
-  }
+    override def ivyDeps = Agg(
+        ivy"org.chipsalliance::chisel:7.2.0"
+    )
+    override def scalacPluginIvyDeps = Agg(
+        ivy"org.chipsalliance:::chisel-plugin:7.2.0"
+    )
+    object test extends SbtTests with TestModule.ScalaTest {
+        override def ivyDeps = m.ivyDeps() ++ Agg(
+            ivy"org.scalatest::scalatest::3.2.19"
+        )
+
+        override def forkArgs = super.forkArgs() ++ Seq(
+            "-Dscalatest.parallel.enabled=true",
+            "-Dscalatest.parallel.mode=concurrent",
+            "-Dscalatest.parallel.config.fixed.pool.size=12"
+        )
+    }
 }