diff --git a/src/testdir/test_termcodes.vim b/src/testdir/test_termcodes.vim
index 05f0d18..298244e 100644
--- a/src/testdir/test_termcodes.vim
+++ b/src/testdir/test_termcodes.vim
@@ -1349,3 +1349,48 @@
   call RunTest_mapping_works_with_mods(function('GetEscCodeCSI27'), 'C-S-A', 8)
   call RunTest_mapping_works_with_mods(function('GetEscCodeCSIu'), 'C-S-A', 8)
 endfunc
+
+func Test_insert_literal()
+  set timeoutlen=10
+  new
+  " CTRL-V CTRL-X inserts a ^X
+  call feedkeys('a' .. GetEscCodeCSIu('V', '5') .. GetEscCodeCSIu('X', '5') .. "\<Esc>", 'Lx!')
+  call assert_equal("\<C-X>", getline(1))
+
+  call setline(1, '')
+  call feedkeys('a' .. GetEscCodeCSI27('V', '5') .. GetEscCodeCSI27('X', '5') .. "\<Esc>", 'Lx!')
+  call assert_equal("\<C-X>", getline(1))
+
+  " CTRL-SHIFT-V CTRL-X inserts escape sequencd
+  call setline(1, '')
+  call feedkeys('a' .. GetEscCodeCSIu('V', '6') .. GetEscCodeCSIu('X', '5') .. "\<Esc>", 'Lx!')
+  call assert_equal("\<Esc>[88;5u", getline(1))
+
+  call setline(1, '')
+  call feedkeys('a' .. GetEscCodeCSI27('V', '6') .. GetEscCodeCSI27('X', '5') .. "\<Esc>", 'Lx!')
+  call assert_equal("\<Esc>[27;5;88~", getline(1))
+
+  bwipe!
+  set timeoutlen&
+endfunc
+
+func Test_cmdline_literal()
+  set timeoutlen=10
+
+  " CTRL-V CTRL-Y inserts a ^Y
+  call feedkeys(':' .. GetEscCodeCSIu('V', '5') .. GetEscCodeCSIu('Y', '5') .. "\<C-B>\"\<CR>", 'Lx!')
+  call assert_equal("\"\<C-Y>", @:)
+
+  call feedkeys(':' .. GetEscCodeCSI27('V', '5') .. GetEscCodeCSI27('Y', '5') .. "\<C-B>\"\<CR>", 'Lx!')
+  call assert_equal("\"\<C-Y>", @:)
+
+  " CTRL-SHIFT-V CTRL-Y inserts escape sequencd
+  call feedkeys(':' .. GetEscCodeCSIu('V', '6') .. GetEscCodeCSIu('Y', '5') .. "\<C-B>\"\<CR>", 'Lx!')
+  call assert_equal("\"\<Esc>[89;5u", @:)
+
+  call setline(1, '')
+  call feedkeys(':' .. GetEscCodeCSI27('V', '6') .. GetEscCodeCSI27('Y', '5') .. "\<C-B>\"\<CR>", 'Lx!')
+  call assert_equal("\"\<Esc>[27;5;89~", @:)
+
+  set timeoutlen&
+endfunc