From 67faa44a1d6c60c3f6e2f28c632c4d8f685eef60 Mon Sep 17 00:00:00 2001
From: eugene yokota <eed3si9n@gmail.com>
Date: Mon, 3 Aug 2026 03:32:19 -0400
Subject: [PATCH] [2.x] test: Add test for Test/baseDirectory (#9544)

---
 sbt-app/src/sbt-test/tests/fork/build.sbt     | 22 +++++++++++++------
 .../fork/core/src/test/scala/FileTest.scala   | 10 +++++++++
 .../tests/fork/src/test/scala/Ensemble.scala  | 21 +++++++++---------
 sbt-app/src/sbt-test/tests/fork/test          |  6 +++--
 4 files changed, 40 insertions(+), 19 deletions(-)
 create mode 100644 sbt-app/src/sbt-test/tests/fork/core/src/test/scala/FileTest.scala

diff --git a/sbt-app/src/sbt-test/tests/fork/build.sbt b/sbt-app/src/sbt-test/tests/fork/build.sbt
index 9456aeff4..c6d1069cf 100644
--- a/sbt-app/src/sbt-test/tests/fork/build.sbt
+++ b/sbt-app/src/sbt-test/tests/fork/build.sbt
@@ -4,18 +4,18 @@ import Defaults._
 val groupSize = 3
 val groups = 3
 
+@transient
 val check = TaskKey[Unit]("check", "Check all files were created and remove them.")
-val scalatest = "org.scalatest" %% "scalatest" % "3.0.5"
-val scalaxml = "org.scala-lang.modules" %% "scala-xml" % "1.1.1"
+val munit = "org.scalameta" %% "munit" % "1.0.4"
 
 def groupId(idx: Int) = "group_" + (idx + 1)
 def groupPrefix(idx: Int) = groupId(idx) + "_file_"
 
 Global / localCacheDirectory := baseDirectory.value / "diskcache"
-ThisBuild / scalaVersion := "2.12.21"
-ThisBuild / organization := "org.example"
+scalaVersion := "3.8.4"
+organization := "com.example"
 
-lazy val root = (project in file("."))
+lazy val root = rootProject
   .settings(
     Test / testGrouping := Def.uncached {
       val tests = (Test / definedTests).value
@@ -38,7 +38,15 @@ lazy val root = (project in file("."))
     },
     concurrentRestrictions := Tags.limit(Tags.ForkedTestGroup, 2) :: Nil,
     libraryDependencies ++= List(
-      scalaxml,
-      scalatest % Test
+      munit % Test
     )
   )
+
+lazy val core = project
+  .settings(
+    Test / fork := true,
+    libraryDependencies ++= List(
+      munit % Test
+    ),
+    Test / baseDirectory := (LocalRootProject / baseDirectory).value,
+  )
diff --git a/sbt-app/src/sbt-test/tests/fork/core/src/test/scala/FileTest.scala b/sbt-app/src/sbt-test/tests/fork/core/src/test/scala/FileTest.scala
new file mode 100644
index 000000000..6c973938e
--- /dev/null
+++ b/sbt-app/src/sbt-test/tests/fork/core/src/test/scala/FileTest.scala
@@ -0,0 +1,10 @@
+import java.io.File
+
+import munit.FunSuite
+
+class FileTest extends FunSuite:
+  test("test baseDirectory") {
+    val x = new File("foo").getAbsoluteFile().getParentFile()
+    assert(x.getName() != "core", s"actual ${x.getName()}")
+  }
+end FileTest
diff --git a/sbt-app/src/sbt-test/tests/fork/src/test/scala/Ensemble.scala b/sbt-app/src/sbt-test/tests/fork/src/test/scala/Ensemble.scala
index 9dbd69cb7..71c1d09dc 100644
--- a/sbt-app/src/sbt-test/tests/fork/src/test/scala/Ensemble.scala
+++ b/sbt-app/src/sbt-test/tests/fork/src/test/scala/Ensemble.scala
@@ -1,16 +1,17 @@
-import org.scalatest.FlatSpec
 import java.io.File
 
-trait Ensemble extends FlatSpec {
-	def i: Int
-	def prefix = System.getProperty("group.prefix")
+import munit.FunSuite
 
-	"an ensemble" should "create all files" in {
-		val f = new File(prefix + i)
-		f.createNewFile
-	}
-}
+trait Ensemble extends FunSuite:
+  def i: Int
+  def prefix = System.getProperty("group.prefix")
+
+  test("an ensemble should create all files") {
+    val f = new File(prefix + i)
+    f.createNewFile
+  }
+end Ensemble
 
 class Ensemble1 extends Ensemble { def i = 1 }
 class Ensemble2 extends Ensemble { def i = 2 }
-class Ensemble3 extends Ensemble { def i = 3 }
\ No newline at end of file
+class Ensemble3 extends Ensemble { def i = 3 }
diff --git a/sbt-app/src/sbt-test/tests/fork/test b/sbt-app/src/sbt-test/tests/fork/test
index de5041ba0..6967b71ca 100644
--- a/sbt-app/src/sbt-test/tests/fork/test
+++ b/sbt-app/src/sbt-test/tests/fork/test
@@ -1,2 +1,4 @@
-> test
-> check
\ No newline at end of file
+> testFull
+> check
+
+> core/testFull