vim-patch:9.1.0893: No test that undofile format does not regress (#37193)

zeertzjq · chrisbra · github-actions[bot] · commit 44eae48b7566 · 2026-01-01T23:40:43.000Z
Problem: No test that undofile format does not regress Solution: include a sample undofile to make sure we are always able to read it This is so, that we don't unintentionally change the undofile format and make sure we can load an undo file that has been created by an older Vim. closes: vim/vim#16127 vim/vim@14382c8 Convert the undo file in samples/ using method from #13973. Co-authored-by: Christian Brabandt <cb@256bit.org> (cherry picked from commit 94f7302)
diff --git a/test/old/testdir/samples/test_undo.txt b/test/old/testdir/samples/test_undo.txt
@@ -0,0 +1,3 @@
+one
+two
+three
diff --git a/test/old/testdir/samples/test_undo.txt.undo b/test/old/testdir/samples/test_undo.txt.undo
diff --git a/test/old/testdir/test_undo.vim b/test/old/testdir/test_undo.vim
@@ -883,4 +883,33 @@ func Test_undo_range_normal()
   bwipe!
 endfunc
 
+func Test_load_existing_undofile()
+  CheckFeature persistent_undo
+  sp samples/test_undo.txt
+  let mess=execute(':verbose rundo samples/test_undo.txt.undo')
+  call assert_match('Finished reading undo file', mess)
+
+  call assert_equal(['one', 'two', 'three'], getline(1, '$'))
+  norm! u
+  call assert_equal(['one', 'two'], getline(1, '$'))
+  norm! u
+  call assert_equal(['one'], getline(1, '$'))
+  norm! u
+  call assert_equal([''], getline(1, '$'))
+  let mess = execute(':norm! u')
+  call assert_equal([''], getline(1, '$'))
+  call assert_match('Already at oldest change', mess)
+  exe ":norm! \<c-r>"
+  call assert_equal(['one'], getline(1, '$'))
+  exe ":norm! \<c-r>"
+  call assert_equal(['one', 'two'], getline(1, '$'))
+  exe ":norm! \<c-r>"
+  call assert_equal(['one', 'two', 'three'], getline(1, '$'))
+  let mess = execute(":norm! \<c-r>")
+  call assert_equal(['one', 'two', 'three'], getline(1, '$'))
+  call assert_match('Already at newest change', mess)
+  bw!
+endfunc
+
+
 " vim: shiftwidth=2 sts=2 expandtab
