diff --git a/src/testdir/test_utf8.vim b/src/testdir/test_utf8.vim
index deb96ea..df0abd3 100644
--- a/src/testdir/test_utf8.vim
+++ b/src/testdir/test_utf8.vim
@@ -62,6 +62,9 @@
   call assert_equal('"Test3 N', getreg(':'))
 
   call garbagecollect(1)
+  delcommand Test1
+  delcommand Test2
+  delcommand Test3
 endfunc
 
 " Yank one 3 byte character and check the mark columns.
@@ -297,6 +300,40 @@
   call StopVimInTerminal(buf)
 endfunc
 
+" For some reason this test causes Test_customlist_completion() to fail on CI,
+" so run it as the last test.
+func Test_zz_ambiwidth_hl_dump()
+  CheckRunVimInTerminal
+
+  let lines =<< trim END
+      call setline(1, [repeat("\u2103", 60), repeat("\u2103", 60)])
+      set ambiwidth=single cursorline list display=lastline
+  END
+  call writefile(lines, 'XAmbiwidthHl', 'D')
+  let buf = RunVimInTerminal('-S XAmbiwidthHl', {'rows': 6, 'cols': 50})
+  call VerifyScreenDump(buf, 'Test_ambiwidth_hl_dump_1', {})
+
+  call term_sendkeys(buf, ":set ambiwidth=double\<CR>")
+  call term_sendkeys(buf, ":echo\<CR>")
+  call VerifyScreenDump(buf, 'Test_ambiwidth_hl_dump_2', {})
+
+  call term_sendkeys(buf, ":set ambiwidth=single\<CR>")
+  call term_sendkeys(buf, ":echo\<CR>")
+  call VerifyScreenDump(buf, 'Test_ambiwidth_hl_dump_1', {})
+
+  if 0 " Enable after #14539 is fixed
+  call term_sendkeys(buf, ":call setcellwidths([[0x2103, 0x2103, 2]])\<CR>")
+  call term_sendkeys(buf, ":echo\<CR>")
+  call VerifyScreenDump(buf, 'Test_ambiwidth_hl_dump_2', {})
+
+  call term_sendkeys(buf, ":call setcellwidths([[0x2103, 0x2103, 1]])\<CR>")
+  call term_sendkeys(buf, ":echo\<CR>")
+  call VerifyScreenDump(buf, 'Test_ambiwidth_hl_dump_1', {})
+  endif
+
+  call StopVimInTerminal(buf)
+endfunc
+
 func Test_print_overlong()
   " Text with more composing characters than MB_MAXBYTES.
   new