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diff --git a/src/testdir/test_langmap.vim b/src/testdir/test_langmap.vim
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+" tests for 'langmap'
+
+source check.vim
+CheckFeature langmap
+
+func Test_langmap()
+  new
+  set langmap=}l,^x,%v
+
+  call setline(1, ['abc'])
+  call feedkeys('gg0}^', 'tx')
+  call assert_equal('ac', getline(1))
+
+  " in Replace mode
+  " need silent! to avoid a delay when entering Insert mode
+  call setline(1, ['abcde'])
+  silent! call feedkeys("gg0lR%{z\<Esc>00", 'tx')
+  call assert_equal('a%{ze', getline(1))
+
+  " in Select mode
+  " need silent! to avoid a delay when entering Insert mode
+  call setline(1, ['abcde'])
+  silent! call feedkeys("gg0}%}\<C-G>}^\<Esc>00", 'tx')
+  call assert_equal('a}^de', getline(1))
+
+  " Error cases
+  call assert_fails('set langmap=aA,b', 'E357:')
+  call assert_fails('set langmap=z;y;y;z', 'E358:')
+
+  " Map character > 256
+  enew!
+  set langmap=āx,ăl,āx
+  call setline(1, ['abcde'])
+  call feedkeys('gg2lā', 'tx')
+  call assert_equal('abde', getline(1))
+
+  " special characters in langmap
+  enew!
+  call setline(1, ['Hello World'])
+  set langmap=\\;\\,,\\,\\;
+  call feedkeys('ggfo,', 'tx')
+  call assert_equal(8, col('.'))
+  call feedkeys(';', 'tx')
+  call assert_equal(5, col('.'))
+  set langmap&
+  set langmap=\\;\\,;\\,\\;
+  call feedkeys('ggfo,', 'tx')
+  call assert_equal(8, col('.'))
+  call feedkeys(';', 'tx')
+  call assert_equal(5, col('.'))
+
+  set langmap=RL
+  let g:counter = 0
+  nnoremap L;L <Cmd>let g:counter += 1<CR>
+  nnoremap <C-L> <Cmd>throw 'This mapping should not be triggered'<CR>
+
+  " 'langmap' is applied to keys without modifiers when matching a mapping
+  call feedkeys('R;R', 'tx')
+  call assert_equal(1, g:counter)
+  nunmap L;L
+  unlet g:counter
+
+  delete
+  call assert_equal('', getline(1))
+  undo
+  call assert_equal('Hello World', getline(1))
+  " 'langmap' does not change Ctrl-R to Ctrl-L for consistency
+  call feedkeys("\<*C-R>", 'tx')
+  call assert_equal('', getline(1))
+
+  set langmap=6L
+  undo
+  setlocal bufhidden=hide
+  let oldbuf = bufnr()
+  enew
+  call assert_notequal(oldbuf, bufnr())
+  " 'langmap' does not change Ctrl-6 to Ctrl-L for consistency
+  " Ctrl-6 becomes Ctrl-^ after merging the Ctrl modifier
+  call feedkeys("\<*C-6>", 'tx')
+  call assert_equal(oldbuf, bufnr())
+  setlocal bufhidden&
+
+  nunmap <C-L>
+
+  set langmap&
+  quit!
+endfunc
+
+" vim: shiftwidth=2 sts=2 expandtab