[patch] add tests for :undolist and the normal U command

[Dominique Pellé]

Hi

Attached patch adds tests for:
- the  :undolist command
- the normal U command

According to https://coveralls.io/github/vim/vim?branch=master
these were not yet covered by tests.

Regards
Dominique

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diff --git a/src/testdir/test_undo.vim b/src/testdir/test_undo.vim
index e521e35..fb1cdc8 100644
--- a/src/testdir/test_undo.vim
+++ b/src/testdir/test_undo.vim
@@ -129,6 +129,39 @@ func Test_undo_del_chars()
   close!
 endfunc
 
+func Test_undolist()
+  new
+  set ul=100
+
+  let a=execute('undolist')
+  call assert_equal("\nNothing to undo", a)
+
+  " 1 leaf (2 changes).
+  call feedkeys('achange1', 'xt')
+  call feedkeys('achange2', 'xt')
+  let a=execute('undolist')
+  call assert_match("^\nnumber changes  when  *saved\n *2  *2 .*$", a)
+
+  " 2 leaves.
+  call feedkeys('u', 'xt')
+  call feedkeys('achange3\<Esc>', 'xt')
+  let a=execute('undolist')
+  call assert_match("^\nnumber changes  when  *saved\n *2  *2  *.*\n *3  *2 .*$", a)
+  close!
+endfunc
+
+func Test_U_command()
+  new
+  set ul=100
+  call feedkeys("achange1\<Esc>", 'xt')
+  call feedkeys("achange2\<Esc>", 'xt')
+  norm! U
+  call assert_equal('', getline(1))
+  norm! U
+  call assert_equal('change1change2', getline(1))
+  close!
+endfunc
+
 func Test_undojoin()
   new
   call feedkeys("Goaaaa\<Esc>", 'xt')