Add missing test data to extra-source-files

ghc-mod.cabal

@@ -71,6 +71,7 @@ Extra-Source-Files:     ChangeLog
                         test/data/pattern-synonyms/*.hs
                         test/data/quasi-quotes/*.hs
                         test/data/template-haskell/*.hs
+                        test/data/target/*.hs
                         test/data/check-missing-warnings/*.hs
 
 Library

test/data/target/Cpp.hs

@@ -0,0 +1,7 @@
+{-# LANGUAGE CPP #-}
+#undef NOTHING
+#ifdef NOTHING
+module WRONG_MODULE where
+#else
+module Cpp where
+#endif