[sbt] test: Enable sbt-test/run/fork (#8943)

sbt-app/src/sbt-test/run/fork/src/main/scala/ForkFail.scala

@@ -1,9 +1,9 @@
 object ForkTest {
   def main(args:Array[String]): Unit = {
-		val name = sys.env.getOrElse("flag.name", "flag")
-		println("Name: " + name)
-		val cwd = (new java.io.File(name)).getAbsoluteFile
-		cwd.getParentFile.mkdirs()
-		cwd.createNewFile()
+    val name = sys.env.getOrElse("flag.name", "flag")
+    println("Name: " + name)
+    val cwd = (new java.io.File(name)).getAbsoluteFile
+    cwd.getParentFile.mkdirs()
+    cwd.createNewFile()
   }
 }

sbt-app/src/sbt-test/run/fork/test

@@ -4,7 +4,7 @@ $ delete flag
 
 $ mkdir forked
 > set fork := true
-> set baseDirectory in run := baseDirectory(_ / "forked").value
+> set run / baseDirectory := baseDirectory(_ / "forked").value
 
 > run forked
 $ exists forked/flag