1 files changed, 16 insertions, 0 deletions
diff --git a/test/functional/ui/fold_spec.lua b/test/functional/ui/fold_spec.lua
index 6bb8bb81c6..3c143d87ca 100644
--- a/test/functional/ui/fold_spec.lua
+++ b/test/functional/ui/fold_spec.lua
@@ -4,6 +4,7 @@ local clear, feed, eq = helpers.clear, helpers.feed, helpers.eq
 local command = helpers.command
 local feed_command = helpers.feed_command
 local insert = helpers.insert
+local expect = helpers.expect
 local funcs = helpers.funcs
 local meths = helpers.meths
 local source = helpers.source
@@ -1911,4 +1912,19 @@ describe("folded lines", function()
     command('%delete')
     eq(0, funcs.foldlevel(1))
   end)
+
+  it('multibyte fold markers work #20438', function()
+    meths.win_set_option(0, 'foldmethod', 'marker')
+    meths.win_set_option(0, 'foldmarker', '«,»')
+    insert([[
+      bbbbb
+      bbbbb
+      bbbbb]])
+    feed('zfgg')
+    expect([[
+      bbbbb/*«*/
+      bbbbb
+      bbbbb/*»*/]])
+    eq(1, funcs.foldlevel(1))
+  end)
 end)