patch 8.2.0509: various code is not properly tested.

Problem:    various code is not properly tested.
Solution:   Add more tests. (Yegappan Lakshmanan, closes #5871)
diff --git a/src/testdir/shared.vim b/src/testdir/shared.vim
index 58b7271..239051e 100644
--- a/src/testdir/shared.vim
+++ b/src/testdir/shared.vim
@@ -337,3 +337,5 @@
   endif
   return v:false
 endfunc
+
+" vim: shiftwidth=2 sts=2 expandtab