diff --git a/scalafmt-core/shared/src/main/scala/org/scalafmt/config/ProjectFiles.scala b/scalafmt-core/shared/src/main/scala/org/scalafmt/config/ProjectFiles.scala
index 4ecc0dbb97..03d227039b 100644
--- a/scalafmt-core/shared/src/main/scala/org/scalafmt/config/ProjectFiles.scala
+++ b/scalafmt-core/shared/src/main/scala/org/scalafmt/config/ProjectFiles.scala
@@ -128,13 +128,13 @@ object ProjectFiles {
       @inline private def is3(implicit dialect: Dialect) =
         dialect.allowSignificantIndentation
 
-      @inline private def nd(text: sourcecode.Text[Dialect]) =
+      @inline private[config] def nd(text: sourcecode.Text[Dialect]) =
         Some(NamedDialect(text))
-      private val s210 = nd(dialects.Scala210)
-      private val s211 = nd(dialects.Scala211)
-      private val s212 = nd(NamedDialect.scala212)
-      private val s213 = nd(NamedDialect.scala213)
-      private val s3 = nd(NamedDialect.scala3)
+      private[config] val s210 = nd(dialects.Scala210)
+      private[config] val s211 = nd(dialects.Scala211)
+      private[config] val s212 = nd(NamedDialect.scala212)
+      private[config] val s213 = nd(NamedDialect.scala213)
+      private[config] val s3 = nd(NamedDialect.scala3)
 
       override def getDialectByLang(lang: String)(implicit
           dialect: Dialect
diff --git a/scalafmt-tests/src/test/scala/org/scalafmt/config/StandordProjectLayoutTest.scala b/scalafmt-tests/src/test/scala/org/scalafmt/config/StandordProjectLayoutTest.scala
new file mode 100644
index 0000000000..9bdc4b82a4
--- /dev/null
+++ b/scalafmt-tests/src/test/scala/org/scalafmt/config/StandordProjectLayoutTest.scala
@@ -0,0 +1,74 @@
+package org.scalafmt.config
+
+import scala.meta.dialects
+
+import org.scalafmt.sysops.AbsoluteFile
+
+class StandordProjectLayoutTest extends munit.FunSuite {
+
+  import ProjectFiles.Layout.StandardConvention._
+
+  Seq(
+    "/prj/src/main/scalaX/src" -> "scalaX",
+    "/prj/src/main/scalaX/src/src" -> "scalaX",
+    "/prj/src/main/scalaX/src/src/src" -> "scalaX",
+    "/prj/src/main/scalaX/src/src/src/src" -> "scalaX",
+    "/prj/src/main/scalaX/src/src/src/src/src" -> "scalaX",
+    "/prj/src/main/scalaX/test/src" -> "scalaX",
+    "/prj/src/main/scalaX/src/test" -> "scalaX",
+    "/prj/src/main/scalaX/test/src/src" -> "scalaX",
+    "/prj/src/main/scalaX/src/test/src" -> "scalaX",
+    "/prj/src/main/scalaX/src/src/test" -> "scalaX",
+    "/prj/src/main/scalaX/test/src/src/src" -> "scalaX",
+    "/prj/src/main/scalaX/src/src/test/src" -> "scalaX",
+    "/prj/src/main/scalaX/src/src/src/test" -> "scalaX",
+    "/prj/src/main/scalaX/test/src/src/src/src" -> "scalaX",
+    "/prj/src/main/scalaX/src/src/src/test/src" -> "scalaX",
+    "/prj/src/main/scalaX/src/src/src/src/test" -> "scalaX",
+    "/prj/src/main/scalaX/x/test/src/src" -> "scalaX",
+    "/prj/src/main/scalaX/x/test/src/src/src" -> "scalaX",
+    "/prj/src/main/scalaX/x/test/src/src/src/src" -> "scalaX",
+    "/prj/src/main/scalaX/src/x/src/src/src" -> "scalaX",
+    "/prj/src/main/scalaX/src/src/x/src/src" -> "scalaX",
+    "/prj/src/main/scalaX/src/src/src/x/src" -> "scalaX",
+    "/prj/src/main/scalaX/src/src/src/src/x" -> "scalaX",
+    "/prj/src/main/scalaX/src/x/src/src/src/src" -> "scalaX",
+    "/prj/src/main/scalaX/src/src/x/src/src/src" -> "scalaX",
+    "/prj/src/main/scalaX/src/src/src/x/src/src" -> "scalaX",
+    "/prj/src/main/scalaX/src/src/src/src/x/src" -> "scalaX",
+    "/prj/src/main/scalaX/src/src/src/src/src/x" -> "scalaX"
+  ).foreach { case (path, expectedLang) =>
+    test(s"StandardConvention.getLang($path) == $expectedLang") {
+      val actualLang = getLang(AbsoluteFile(path))
+      assertEquals(actualLang.orNull, expectedLang)
+    }
+  }
+
+  Seq(
+    (s210, "scala-2.10", None),
+    (s211, "scala-2.10", s210),
+    (s210, "scala-2.11", s211),
+    (s211, "scala-2.11", None),
+    (s212, "scala-2.11", s211),
+    (s211, "scala-2.12", s212),
+    (s212, "scala-2.12", None),
+    (s213, "scala-2.12", s212),
+    (s212, "scala-2.13", s213),
+    (s213, "scala-2.13", None),
+    (s3, "scala-2.13", s213),
+    (s212, "scala-2", None),
+    (s213, "scala-2", None),
+    (s3, "scala-2", s213),
+    (s213, "scala-3", s3),
+    (s3, "scala-3", None),
+    (nd(dialects.Scala3Future), "scala-3", None)
+  ).foreach { case (curDialectOpt, lang, expDialectOpt) =>
+    val curName = curDialectOpt.map(_.name).orNull
+    val expName = expDialectOpt.map(_.name).orNull
+    test(s"StandardConvention.getDialectByLang($lang)($curName) == $expName") {
+      val initDialect = curDialectOpt.fold(dialects.Scala3Future)(_.dialect)
+      assertEquals(getDialectByLang(lang)(initDialect), expDialectOpt)
+    }
+  }
+
+}