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diff --git a/test/functional/legacy/072_undo_file_spec.lua b/test/functional/legacy/072_undo_file_spec.lua
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+++ b/test/functional/legacy/072_undo_file_spec.lua
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+-- Tests for undo file.
+-- Since this script is sourced we need to explicitly break changes up in
+-- undo-able pieces.  Do that by setting 'undolevels'.
+
+local helpers = require('test.functional.helpers')
+local feed, insert, source = helpers.feed, helpers.insert, helpers.source
+local clear, execute, expect = helpers.clear, helpers.execute, helpers.expect
+
+describe('72', function()
+  setup(clear)
+
+  it('is working', function()
+    insert([[
+      1111 -----
+      2222 -----
+      
+      123456789]])
+
+    -- Test 'undofile': first a simple one-line change.
+    execute('set visualbell')
+    execute('set ul=100 undofile nomore')
+    execute('e! Xtestfile')
+    feed('ggdGithis is one line<esc>:set ul=100<cr>')
+    execute('s/one/ONE/')
+    execute('set ul=100')
+    execute('w')
+    execute('bwipe!')
+    execute('e Xtestfile')
+    feed('u:.w! test.out<cr>')
+
+    -- Test 'undofile', change in original file fails check.
+    execute('set noundofile')
+    execute('e! Xtestfile')
+    execute('s/line/Line/')
+    execute('w')
+    execute('set undofile')
+    execute('bwipe!')
+    execute('e Xtestfile')
+    ---- TODO: this beeps.
+    feed('u:.w >>test.out<cr>')
+
+    -- Test 'undofile', add 10 lines, delete 6 lines, undo 3.
+    execute('set undofile')
+    feed('ggdGione<cr>')
+    feed('two<cr>')
+    feed('three<cr>')
+    feed('four<cr>')
+    feed('five<cr>')
+    feed('six<cr>')
+    feed('seven<cr>')
+    feed('eight<cr>')
+    feed('nine<cr>')
+    feed('ten<esc>:set ul=100<cr>')
+    feed('3Gdd:set ul=100<cr>')
+    feed('dd:set ul=100<cr>')
+    feed('dd:set ul=100<cr>')
+    feed('dd:set ul=100<cr>')
+    feed('dd:set ul=100<cr>')
+    feed('dd:set ul=100<cr>')
+    execute('w')
+    execute('bwipe!')
+    execute('e Xtestfile')
+    feed('uuu:w >>test.out<cr>')
+
+    -- Test that reading the undofiles when setting undofile works.
+    execute('set noundofile ul=0')
+    feed('i<cr>')
+    feed('<esc>u:e! Xtestfile<cr>')
+    execute('set undofile ul=100')
+    feed('uuuuuu:w >>test.out<cr>')
+
+    ---- Open the output to see if it meets the expections
+    execute('e! test.out')
+
+    -- Assert buffer contents.
+    expect([[
+      this is one line
+      this is ONE Line
+      one
+      two
+      six
+      seven
+      eight
+      nine
+      ten
+      one
+      two
+      three
+      four
+      five
+      six
+      seven
+      eight
+      nine
+      ten]])
+  end)
+
+  teardown(function()
+      os.remove('.Xtestfile.un~')
+  end)
+end)