diff --git a/src/testdir/test_autocmd.vim b/src/testdir/test_autocmd.vim
index bcbddf9..5ad1730 100644
--- a/src/testdir/test_autocmd.vim
+++ b/src/testdir/test_autocmd.vim
@@ -4752,4 +4752,74 @@
   set hidden&vim
 endfunc
 
+func Test_KeyInputPre()
+  " Consume previous keys
+  call feedkeys('', 'ntx')
+
+  " KeyInputPre can record input keys.
+  let s:keys = []
+  au KeyInputPre n call add(s:keys, v:char)
+
+  call feedkeys('jkjkjjj', 'ntx')
+  call assert_equal(
+        \ ['j', 'k', 'j', 'k', 'j', 'j', 'j'],
+        \ s:keys)
+
+  unlet s:keys
+  au! KeyInputPre
+
+  " KeyInputPre can handle multibyte.
+  let s:keys = []
+  au KeyInputPre * call add(s:keys, v:char)
+  edit Xxx1
+
+  call feedkeys("iあ\<ESC>", 'ntx')
+  call assert_equal(['i', "あ", "\<ESC>"], s:keys)
+
+  bwipe! Xxx1
+  unlet s:keys
+  au! KeyInputPre
+
+  " KeyInputPre can change input keys.
+  au KeyInputPre i if v:char ==# 'a' | let v:char = 'b' | endif
+  edit Xxx1
+
+  call feedkeys("iaabb\<ESC>", 'ntx')
+  call assert_equal(getline('.'), 'bbbb')
+
+  bwipe! Xxx1
+  au! KeyInputPre
+
+  " KeyInputPre returns multiple characters.
+  au KeyInputPre i if v:char ==# 'a' | let v:char = 'cccc' | endif
+  edit Xxx1
+
+  call feedkeys("iaabb\<ESC>", 'ntx')
+  call assert_equal(getline('.'), 'ccbb')
+
+  bwipe! Xxx1
+  au! KeyInputPre
+
+  " KeyInputPre can use special keys.
+  au KeyInputPre i if v:char ==# 'a' | let v:char = "\<Ignore>" | endif
+  edit Xxx1
+
+  call feedkeys("iaabb\<ESC>", 'ntx')
+  call assert_equal(getline('.'), 'bb')
+
+  bwipe! Xxx1
+  au! KeyInputPre
+
+  " Test for v:event.typed
+  au KeyInputPre n call assert_true(v:event.typed)
+  call feedkeys('j', 'ntx')
+
+  au! KeyInputPre
+
+  au KeyInputPre n call assert_false(v:event.typed)
+  call feedkeys('j', 'nx')
+
+  au! KeyInputPre
+endfunc
+
 " vim: shiftwidth=2 sts=2 expandtab