Add test for spaced single line comments

Author: philderbeast

tests/empty-comment.test

@@ -208,4 +208,23 @@ Found:
   {- ^-}
 Perhaps you should remove it.
 
-6 hints
+6 hints
+
+---------------------------------------------------------------------
+RUN tests/empty-comment-mixed.hs
+FILE tests/empty-comment-mixed.hs
+
+-- |
+--
+-- Comment with blank line comment space above and below.
+--
+commentWithSpace = 1
+
+-- | Introduction line.
+--
+-- Comment with introduction line above and blank line below.
+--
+CommentWithSpaceOnlyAfter = 1
+
+OUTPUT
+No hints