patch 7.4.1686
Problem:    When running tests $HOME/.viminfo is written. (James McCoy)
Solution:   Add 'nviminfo' to the 'viminfo' option. (closes #722)
diff --git a/src/testdir/test_viminfo.vim b/src/testdir/test_viminfo.vim
index 3efe75e..a979ab9 100644
--- a/src/testdir/test_viminfo.vim
+++ b/src/testdir/test_viminfo.vim
@@ -36,7 +36,7 @@
   " store a really long list, so line wrapping will occur in viminfo file
   let test_list = range(1,100)
   let g:MY_GLOBAL_LIST = test_list
-  set viminfo='100,<50,s10,h,!
+  set viminfo='100,<50,s10,h,!,nviminfo
   wv! Xviminfo
   unlet g:MY_GLOBAL_DICT
   unlet g:MY_GLOBAL_LIST