commit e9ebc9a91cac357fd4888f4b71fdff7d97b41160
author Bram Moolenaar <Bram@vim.org> Sun May 19 15:27:14 2019 +0200
committer Bram Moolenaar <Bram@vim.org> Sun May 19 15:27:14 2019 +0200
tree c0625571a7e082e117c2be5452c3529c1f317891
parent 338dfdad3844ebb1ce1d56c421d1f698c086eb0c

patch 8.1.1352: undofile() reports wrong name

Problem:    Undofile() reports wrong name. (Francisco Giordano)
Solution:   Clean up the name before changing path separators. (closes #4392,
            closes #4394)

src/testdir/test_undo.vim

diff --git a/src/testdir/test_undo.vim b/src/testdir/test_undo.vim
index 7c93e23..ba1c861 100644
--- a/src/testdir/test_undo.vim
+++ b/src/testdir/test_undo.vim
@@ -440,5 +440,10 @@
   " Test undofile() with 'undodir' set to a non-existing directory.
   call assert_equal('', undofile('Xundofoo'))
 
+  if isdirectory('/tmp')
+    set undodir=/tmp
+    call assert_equal('/tmp/%tmp%file', undofile('///tmp/file'))
+  endif
+
   set undodir&
 endfunc