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diff --git a/src/testdir/test_bufline.vim b/src/testdir/test_bufline.vim
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+" Tests for setbufline(), getbufline(), appendbufline(), deletebufline()
+
+source shared.vim
+source screendump.vim
+source check.vim
+
+func Test_setbufline_getbufline()
+  new
+  let b = bufnr('%')
+  hide
+  call assert_equal(0, setbufline(b, 1, ['foo', 'bar']))
+  call assert_equal(['foo'], getbufline(b, 1))
+  call assert_equal(['bar'], getbufline(b, '$'))
+  call assert_equal(['foo', 'bar'], getbufline(b, 1, 2))
+  exe "bd!" b
+  call assert_equal([], getbufline(b, 1, 2))
+
+  split Xtest
+  call setline(1, ['a', 'b', 'c'])
+  let b = bufnr('%')
+  wincmd w
+
+  call assert_equal(1, setbufline(b, 5, 'x'))
+  call assert_equal(1, setbufline(b, 5, ['x']))
+  call assert_equal(1, setbufline(b, 5, []))
+  call assert_equal(1, setbufline(b, 5, test_null_list()))
+
+  call assert_equal(1, 'x'->setbufline(bufnr('$') + 1, 1))
+  call assert_equal(1, ['x']->setbufline(bufnr('$') + 1, 1))
+  call assert_equal(1, []->setbufline(bufnr('$') + 1, 1))
+  call assert_equal(1, test_null_list()->setbufline(bufnr('$') + 1, 1))
+
+  call assert_equal(['a', 'b', 'c'], getbufline(b, 1, '$'))
+
+  call assert_equal(0, setbufline(b, 4, ['d', 'e']))
+  call assert_equal(['c'], b->getbufline(3))
+  call assert_equal(['d'], getbufline(b, 4))
+  call assert_equal(['e'], getbufline(b, 5))
+  call assert_equal([], getbufline(b, 6))
+  call assert_equal([], getbufline(b, 2, 1))
+  exe "bwipe! " . b
+endfunc
+
+func Test_setbufline_getbufline_fold()
+  split Xtest
+  setlocal foldmethod=expr foldexpr=0
+  let b = bufnr('%')
+  new
+  call assert_equal(0, setbufline(b, 1, ['foo', 'bar']))
+  call assert_equal(['foo'], getbufline(b, 1))
+  call assert_equal(['bar'], getbufline(b, 2))
+  call assert_equal(['foo', 'bar'], getbufline(b, 1, 2))
+  exe "bwipe!" b
+  bwipe!
+endfunc
+
+func Test_setbufline_getbufline_fold_tab()
+  split Xtest
+  setlocal foldmethod=expr foldexpr=0
+  let b = bufnr('%')
+  tab new
+  call assert_equal(0, setbufline(b, 1, ['foo', 'bar']))
+  call assert_equal(['foo'], getbufline(b, 1))
+  call assert_equal(['bar'], getbufline(b, 2))
+  call assert_equal(['foo', 'bar'], getbufline(b, 1, 2))
+  exe "bwipe!" b
+  bwipe!
+endfunc
+
+func Test_setline_startup()
+  let cmd = GetVimCommand('Xscript')
+  if cmd == ''
+    return
+  endif
+  call writefile(['call setline(1, "Hello")', 'silent w Xtest', 'q!'], 'Xscript')
+  call system(cmd)
+  call assert_equal(['Hello'], readfile('Xtest'))
+
+  call delete('Xscript')
+  call delete('Xtest')
+endfunc
+
+func Test_appendbufline()
+  new
+  let b = bufnr('%')
+  hide
+  call assert_equal(0, appendbufline(b, 0, ['foo', 'bar']))
+  call assert_equal(['foo'], getbufline(b, 1))
+  call assert_equal(['bar'], getbufline(b, 2))
+  call assert_equal(['foo', 'bar'], getbufline(b, 1, 2))
+  exe "bd!" b
+  call assert_equal([], getbufline(b, 1, 2))
+
+  split Xtest
+  call setline(1, ['a', 'b', 'c'])
+  let b = bufnr('%')
+  wincmd w
+
+  call assert_equal(1, appendbufline(b, -1, 'x'))
+  call assert_equal(1, appendbufline(b, -1, ['x']))
+  call assert_equal(1, appendbufline(b, -1, []))
+  call assert_equal(1, appendbufline(b, -1, test_null_list()))
+
+  call assert_equal(1, appendbufline(b, 4, 'x'))
+  call assert_equal(1, appendbufline(b, 4, ['x']))
+  call assert_equal(1, appendbufline(b, 4, []))
+  call assert_equal(1, appendbufline(b, 4, test_null_list()))
+
+  call assert_equal(1, appendbufline(1234, 1, 'x'))
+  call assert_equal(1, appendbufline(1234, 1, ['x']))
+  call assert_equal(1, appendbufline(1234, 1, []))
+  call assert_equal(1, appendbufline(1234, 1, test_null_list()))
+
+  call assert_equal(0, appendbufline(b, 1, []))
+  call assert_equal(0, appendbufline(b, 1, test_null_list()))
+  call assert_equal(1, appendbufline(b, 3, []))
+  call assert_equal(1, appendbufline(b, 3, test_null_list()))
+
+  call assert_equal(['a', 'b', 'c'], getbufline(b, 1, '$'))
+
+  call assert_equal(0, appendbufline(b, 3, ['d', 'e']))
+  call assert_equal(['c'], getbufline(b, 3))
+  call assert_equal(['d'], getbufline(b, 4))
+  call assert_equal(['e'], getbufline(b, 5))
+  call assert_equal([], getbufline(b, 6))
+  exe "bwipe! " . b
+endfunc
+
+func Test_appendbufline_no_E315()
+  let after =<< trim [CODE]
+    set stl=%f ls=2
+    new
+    let buf = bufnr("%")
+    quit
+    vsp
+    exec "buffer" buf
+    wincmd w
+    call appendbufline(buf, 0, "abc")
+    redraw
+    while getbufline(buf, 1)[0] =~ "^\\s*$"
+      sleep 10m
+    endwhile
+    au VimLeavePre * call writefile([v:errmsg], "Xerror")
+    au VimLeavePre * call writefile(["done"], "Xdone")
+    qall!
+  [CODE]
+
+  if !RunVim([], after, '--clean')
+    return
+  endif
+  call assert_notmatch("^E315:", readfile("Xerror")[0])
+  call assert_equal("done", readfile("Xdone")[0])
+  call delete("Xerror")
+  call delete("Xdone")
+endfunc
+
+func Test_deletebufline()
+  new
+  let b = bufnr('%')
+  call setline(1, ['aaa', 'bbb', 'ccc'])
+  hide
+  call assert_equal(0, deletebufline(b, 2))
+  call assert_equal(['aaa', 'ccc'], getbufline(b, 1, 2))
+  call assert_equal(0, deletebufline(b, 2, 8))
+  call assert_equal(['aaa'], getbufline(b, 1, 2))
+  exe "bd!" b
+  call assert_equal(1, b->deletebufline(1))
+
+  call assert_equal(1, deletebufline(-1, 1))
+
+  split Xtest
+  call setline(1, ['a', 'b', 'c'])
+  call cursor(line('$'), 1)
+  let b = bufnr('%')
+  wincmd w
+  call assert_equal(1, deletebufline(b, 4))
+  call assert_equal(0, deletebufline(b, 1))
+  call assert_equal(['b', 'c'], getbufline(b, 1, 2))
+  exe "bwipe! " . b
+endfunc
+
+func Test_appendbufline_redraw()
+  CheckScreendump
+
+  let lines =<< trim END
+    new foo
+    let winnr = 'foo'->bufwinnr()
+    let buf = bufnr('foo')
+    wincmd p
+    call appendbufline(buf, '$', range(1,200))
+    exe winnr .. 'wincmd w'
+    norm! G
+    wincmd p
+    call deletebufline(buf, 1, '$')
+    call appendbufline(buf, '$', 'Hello Vim world...')
+  END
+  call writefile(lines, 'XscriptMatchCommon')
+  let buf = RunVimInTerminal('-S XscriptMatchCommon', #{rows: 10})
+  call TermWait(buf)
+  call VerifyScreenDump(buf, 'Test_appendbufline_1', {})
+
+  call StopVimInTerminal(buf)
+  call delete('XscriptMatchCommon')
+endfunc
+
+" vim: shiftwidth=2 sts=2 expandtab