1 files changed, 17 insertions, 0 deletions
diff --git a/compiler/test/dotty/tools/StdLibSources.scala b/compiler/test/dotty/tools/StdLibSources.scala
index e3da36f22..24ca9b80b 100644
--- a/compiler/test/dotty/tools/StdLibSources.scala
+++ b/compiler/test/dotty/tools/StdLibSources.scala
@@ -57,3 +57,20 @@ object StdLibSources {
     .toList
 
 }
+
+class StdLibSources {
+  import org.junit.Test
+  import org.junit.Assert._
+
+  @Test def checkWBLists = {
+    val stdlibFilesBlackListed = StdLibSources.blacklisted
+
+    val duplicates = stdlibFilesBlackListed.groupBy(x => x).filter(_._2.size > 1).filter(_._2.size > 1)
+    val msg = duplicates.map(x => s"'${x._1}' appears ${x._2.size} times").mkString(s"Duplicate entries in ${StdLibSources.blacklistFile}:\n", "\n", "\n")
+    assertTrue(msg, duplicates.isEmpty)
+
+    val filesNotInStdLib = stdlibFilesBlackListed.toSet -- StdLibSources.all
+    val msg2 = filesNotInStdLib.map(x => s"'$x'").mkString(s"Entries in ${StdLibSources.blacklistFile} where not found:\n", "\n", "\n")
+    assertTrue(msg2, filesNotInStdLib.isEmpty)
+  }
+}