local t = require('test.testutil')
local n = require('test.functional.testnvim')()
local Screen = require('test.functional.ui.screen')
local tt = require('test.functional.terminal.testutil')

local feed, clear = n.feed, n.clear
local testprg, command = n.testprg, n.command
local eq, eval = t.eq, n.eval
local matches = t.matches
local poke_eventloop = n.poke_eventloop
local hide_cursor = tt.hide_cursor
local show_cursor = tt.show_cursor
local is_os = t.is_os
local skip = t.skip

describe(':terminal cursor', function()
  local screen

  before_each(function()
    clear()
    screen = tt.screen_setup()
  end)

  it('moves the screen cursor when focused', function()
    tt.feed_data('testing cursor')
    screen:expect([[
      tty ready                                         |
      testing cursor{1: }                                   |
                                                        |*4
      {3:-- TERMINAL --}                                    |
    ]])
  end)

  it('is highlighted when not focused', function()
    feed('<c-\\><c-n>')
    screen:expect([[
      tty ready                                         |
      {2:^ }                                                 |
                                                        |*5
    ]])
  end)

  describe('with number column', function()
    before_each(function()
      feed('<c-\\><c-n>:set number<cr>')
    end)

    it('is positioned correctly when unfocused', function()
      screen:expect([[
        {7:  1 }tty ready                                     |
        {7:  2 }^rows: 6, cols: 46                             |
        {7:  3 }{2: }                                             |
        {7:  4 }                                              |
        {7:  5 }                                              |
        {7:  6 }                                              |
        :set number                                       |
      ]])
    end)

    it('is positioned correctly when focused', function()
      screen:expect([[
        {7:  1 }tty ready                                     |
        {7:  2 }^rows: 6, cols: 46                             |
        {7:  3 }{2: }                                             |
        {7:  4 }                                              |
        {7:  5 }                                              |
        {7:  6 }                                              |
        :set number                                       |
      ]])
      feed('i')
      n.poke_eventloop()
      screen:expect([[
        {7:  1 }tty ready                                     |
        {7:  2 }rows: 6, cols: 46                             |
        {7:  3 }{1: }                                             |
        {7:  4 }                                              |
        {7:  5 }                                              |
        {7:  6 }                                              |
        {3:-- TERMINAL --}                                    |
      ]])
    end)
  end)

  describe('when invisible', function()
    it('is not highlighted and is detached from screen cursor', function()
      skip(is_os('win'))
      hide_cursor()
      screen:expect([[
        tty ready                                         |
                                                          |*5
        {3:-- TERMINAL --}                                    |
      ]])
      show_cursor()
      screen:expect([[
        tty ready                                         |
        {1: }                                                 |
                                                          |*4
        {3:-- TERMINAL --}                                    |
      ]])
      -- same for when the terminal is unfocused
      feed('<c-\\><c-n>')
      hide_cursor()
      screen:expect([[
        tty ready                                         |
        ^                                                  |
                                                          |*5
      ]])
      show_cursor()
      screen:expect([[
        tty ready                                         |
        {2:^ }                                                 |
                                                          |*5
      ]])
    end)
  end)
end)

describe('cursor with customized highlighting', function()
  local screen

  before_each(function()
    clear()
    command('highlight TermCursor ctermfg=45 ctermbg=46 cterm=NONE')
    command('highlight TermCursorNC ctermfg=55 ctermbg=56 cterm=NONE')
    screen = Screen.new(50, 7)
    screen:set_default_attr_ids({
      [1] = { foreground = 45, background = 46 },
      [2] = { foreground = 55, background = 56 },
      [3] = { bold = true },
    })
    screen:attach({ rgb = false })
    command('call termopen(["' .. testprg('tty-test') .. '"])')
    feed('i')
    poke_eventloop()
  end)

  it('overrides the default highlighting', function()
    screen:expect([[
      tty ready                                         |
      {1: }                                                 |
                                                        |*4
      {3:-- TERMINAL --}                                    |
    ]])
    feed('<c-\\><c-n>')
    screen:expect([[
      tty ready                                         |
      {2:^ }                                                 |
                                                        |*5
    ]])
  end)
end)

describe('buffer cursor position is correct in terminal without number column', function()
  local screen

  local function setup_ex_register(str)
    screen = tt.setup_child_nvim({
      '-u',
      'NONE',
      '-i',
      'NONE',
      '-E',
      '--cmd',
      string.format('let @r = "%s"', str),
      -- <Left> and <Right> don't always work
      '--cmd',
      'cnoremap <C-X> <Left>',
      '--cmd',
      'cnoremap <C-O> <Right>',
      '--cmd',
      'set notermguicolors',
    }, {
      cols = 70,
    })
    screen:set_default_attr_ids({
      [1] = { foreground = 253, background = 11 },
      [2] = { reverse = true },
      [3] = { bold = true },
      [4] = { background = 11 },
    })
    -- Also check for real cursor position, as it is used for stuff like input methods
    screen._handle_busy_start = function() end
    screen._handle_busy_stop = function() end
    screen:expect([[
                                                                            |*4
      Entering Ex mode.  Type "visual" to go to Normal mode.                |
      :{2:^ }                                                                    |
      {3:-- TERMINAL --}                                                        |
    ]])
  end

  before_each(clear)

  describe('in a line with no multibyte chars or trailing spaces,', function()
    before_each(function()
      setup_ex_register('aaaaaaaa')
    end)

    it('at the end', function()
      feed('<C-R>r')
      screen:expect([[
                                                                              |*4
        Entering Ex mode.  Type "visual" to go to Normal mode.                |
        :aaaaaaaa{2:^ }                                                            |
        {3:-- TERMINAL --}                                                        |
      ]])
      eq({ 6, 9 }, eval('nvim_win_get_cursor(0)'))
      feed([[<C-\><C-N>]])
      screen:expect([[
                                                                              |*4
        Entering Ex mode.  Type "visual" to go to Normal mode.                |
        :aaaaaaa^a{4: }                                                            |
                                                                              |
      ]])
      eq({ 6, 8 }, eval('nvim_win_get_cursor(0)'))
    end)

    it('near the end', function()
      feed('<C-R>r<C-X><C-X>')
      screen:expect([[
                                                                              |*4
        Entering Ex mode.  Type "visual" to go to Normal mode.                |
        :aaaaaa{2:^a}a                                                             |
        {3:-- TERMINAL --}                                                        |
      ]])
      eq({ 6, 7 }, eval('nvim_win_get_cursor(0)'))
      feed([[<C-\><C-N>]])
      screen:expect([[
                                                                              |*4
        Entering Ex mode.  Type "visual" to go to Normal mode.                |
        :aaaaa^a{4:a}a                                                             |
                                                                              |
      ]])
      eq({ 6, 6 }, eval('nvim_win_get_cursor(0)'))
    end)

    it('near the start', function()
      feed('<C-R>r<C-B><C-O>')
      screen:expect([[
                                                                              |*4
        Entering Ex mode.  Type "visual" to go to Normal mode.                |
        :a{2:^a}aaaaaa                                                             |
        {3:-- TERMINAL --}                                                        |
      ]])
      eq({ 6, 2 }, eval('nvim_win_get_cursor(0)'))
      feed([[<C-\><C-N>]])
      screen:expect([[
                                                                              |*4
        Entering Ex mode.  Type "visual" to go to Normal mode.                |
        :^a{4:a}aaaaaa                                                             |
                                                                              |
      ]])
      eq({ 6, 1 }, eval('nvim_win_get_cursor(0)'))
    end)
  end)

  describe('in a line with single-cell multibyte chars and no trailing spaces,', function()
    before_each(function()
      setup_ex_register('µµµµµµµµ')
    end)

    it('at the end', function()
      feed('<C-R>r')
      screen:expect([[
                                                                              |*4
        Entering Ex mode.  Type "visual" to go to Normal mode.                |
        :µµµµµµµµ{2:^ }                                                            |
        {3:-- TERMINAL --}                                                        |
      ]])
      eq({ 6, 17 }, eval('nvim_win_get_cursor(0)'))
      feed([[<C-\><C-N>]])
      screen:expect([[
                                                                              |*4
        Entering Ex mode.  Type "visual" to go to Normal mode.                |
        :µµµµµµµ^µ{4: }                                                            |
                                                                              |
      ]])
      eq({ 6, 15 }, eval('nvim_win_get_cursor(0)'))
    end)

    it('near the end', function()
      feed('<C-R>r<C-X><C-X>')
      screen:expect([[
                                                                              |*4
        Entering Ex mode.  Type "visual" to go to Normal mode.                |
        :µµµµµµ{2:^µ}µ                                                             |
        {3:-- TERMINAL --}                                                        |
      ]])
      eq({ 6, 13 }, eval('nvim_win_get_cursor(0)'))
      feed([[<C-\><C-N>]])
      screen:expect([[
                                                                              |*4
        Entering Ex mode.  Type "visual" to go to Normal mode.                |
        :µµµµµ^µ{4:µ}µ                                                             |
                                                                              |
      ]])
      eq({ 6, 11 }, eval('nvim_win_get_cursor(0)'))
    end)

    it('near the start', function()
      feed('<C-R>r<C-B><C-O>')
      screen:expect([[
                                                                              |*4
        Entering Ex mode.  Type "visual" to go to Normal mode.                |
        :µ{2:^µ}µµµµµµ                                                             |
        {3:-- TERMINAL --}                                                        |
      ]])
      eq({ 6, 3 }, eval('nvim_win_get_cursor(0)'))
      feed([[<C-\><C-N>]])
      screen:expect([[
                                                                              |*4
        Entering Ex mode.  Type "visual" to go to Normal mode.                |
        :^µ{4:µ}µµµµµµ                                                             |
                                                                              |
      ]])
      eq({ 6, 1 }, eval('nvim_win_get_cursor(0)'))
    end)
  end)

  describe('in a line with single-cell composed multibyte chars and no trailing spaces,', function()
    before_each(function()
      setup_ex_register('µ̳µ̳µ̳µ̳µ̳µ̳µ̳µ̳')
    end)

    it('at the end', function()
      feed('<C-R>r')
      screen:expect([[
                                                                              |*4
        Entering Ex mode.  Type "visual" to go to Normal mode.                |
        :µ̳µ̳µ̳µ̳µ̳µ̳µ̳µ̳{2:^ }                                                            |
        {3:-- TERMINAL --}                                                        |
      ]])
      eq({ 6, 33 }, eval('nvim_win_get_cursor(0)'))
      feed([[<C-\><C-N>]])
      screen:expect([[
                                                                              |*4
        Entering Ex mode.  Type "visual" to go to Normal mode.                |
        :µ̳µ̳µ̳µ̳µ̳µ̳µ̳^µ̳{4: }                                                            |
                                                                              |
      ]])
      eq({ 6, 29 }, eval('nvim_win_get_cursor(0)'))
    end)

    it('near the end', function()
      skip(is_os('win'))
      feed('<C-R>r<C-X><C-X>')
      screen:expect([[
                                                                              |*4
        Entering Ex mode.  Type "visual" to go to Normal mode.                |
        :µ̳µ̳µ̳µ̳µ̳µ̳{2:^µ̳}µ̳                                                             |
        {3:-- TERMINAL --}                                                        |
      ]])
      eq({ 6, 25 }, eval('nvim_win_get_cursor(0)'))
      feed([[<C-\><C-N>]])
      screen:expect([[
                                                                              |*4
        Entering Ex mode.  Type "visual" to go to Normal mode.                |
        :µ̳µ̳µ̳µ̳µ̳^µ̳{4:µ̳}µ̳                                                             |
                                                                              |
      ]])
      eq({ 6, 21 }, eval('nvim_win_get_cursor(0)'))
    end)

    it('near the start', function()
      skip(is_os('win'))
      feed('<C-R>r<C-B><C-O>')
      screen:expect([[
                                                                              |*4
        Entering Ex mode.  Type "visual" to go to Normal mode.                |
        :µ̳{2:^µ̳}µ̳µ̳µ̳µ̳µ̳µ̳                                                             |
        {3:-- TERMINAL --}                                                        |
      ]])
      eq({ 6, 5 }, eval('nvim_win_get_cursor(0)'))
      feed([[<C-\><C-N>]])
      screen:expect([[
                                                                              |*4
        Entering Ex mode.  Type "visual" to go to Normal mode.                |
        :^µ̳{4:µ̳}µ̳µ̳µ̳µ̳µ̳µ̳                                                             |
                                                                              |
      ]])
      eq({ 6, 1 }, eval('nvim_win_get_cursor(0)'))
    end)
  end)

  describe('in a line with double-cell multibyte chars and no trailing spaces,', function()
    before_each(function()
      setup_ex_register('哦哦哦哦哦哦哦哦')
    end)

    it('at the end', function()
      feed('<C-R>r')
      screen:expect([[
                                                                              |*4
        Entering Ex mode.  Type "visual" to go to Normal mode.                |
        :哦哦哦哦哦哦哦哦{2:^ }                                                    |
        {3:-- TERMINAL --}                                                        |
      ]])
      eq({ 6, 25 }, eval('nvim_win_get_cursor(0)'))
      feed([[<C-\><C-N>]])
      screen:expect([[
                                                                              |*4
        Entering Ex mode.  Type "visual" to go to Normal mode.                |
        :哦哦哦哦哦哦哦^哦{4: }                                                    |
                                                                              |
      ]])
      eq({ 6, 22 }, eval('nvim_win_get_cursor(0)'))
    end)

    it('near the end', function()
      feed('<C-R>r<C-X><C-X>')
      screen:expect([[
                                                                              |*4
        Entering Ex mode.  Type "visual" to go to Normal mode.                |
        :哦哦哦哦哦哦{2:^哦}哦                                                     |
        {3:-- TERMINAL --}                                                        |
      ]])
      eq({ 6, 19 }, eval('nvim_win_get_cursor(0)'))
      feed([[<C-\><C-N>]])
      screen:expect([[
                                                                              |*4
        Entering Ex mode.  Type "visual" to go to Normal mode.                |
        :哦哦哦哦哦^哦{4:哦}哦                                                     |
                                                                              |
      ]])
      eq({ 6, 16 }, eval('nvim_win_get_cursor(0)'))
    end)

    it('near the start', function()
      feed('<C-R>r<C-B><C-O>')
      screen:expect([[
                                                                              |*4
        Entering Ex mode.  Type "visual" to go to Normal mode.                |
        :哦{2:^哦}哦哦哦哦哦哦                                                     |
        {3:-- TERMINAL --}                                                        |
      ]])
      eq({ 6, 4 }, eval('nvim_win_get_cursor(0)'))
      feed([[<C-\><C-N>]])
      screen:expect([[
                                                                              |*4
        Entering Ex mode.  Type "visual" to go to Normal mode.                |
        :^哦{4:哦}哦哦哦哦哦哦                                                     |
                                                                              |
      ]])
      eq({ 6, 1 }, eval('nvim_win_get_cursor(0)'))
    end)
  end)

  it('at the end of a line with trailing spaces #16234', function()
    setup_ex_register('aaaaaaaa    ')
    feed('<C-R>r')
    screen:expect([[
                                                                            |*4
      Entering Ex mode.  Type "visual" to go to Normal mode.                |
      :aaaaaaaa    {2:^ }                                                        |
      {3:-- TERMINAL --}                                                        |
    ]])
    matches('^:aaaaaaaa    [ ]*$', eval('nvim_get_current_line()'))
    eq({ 6, 13 }, eval('nvim_win_get_cursor(0)'))
    feed([[<C-\><C-N>]])
    screen:expect([[
                                                                            |*4
      Entering Ex mode.  Type "visual" to go to Normal mode.                |
      :aaaaaaaa   ^ {4: }                                                        |
                                                                            |
    ]])
    eq({ 6, 12 }, eval('nvim_win_get_cursor(0)'))
  end)
end)

describe('buffer cursor position is correct in terminal with number column', function()
  local screen

  local function setup_ex_register(str)
    screen = tt.setup_child_nvim({
      '-u',
      'NONE',
      '-i',
      'NONE',
      '-E',
      '--cmd',
      string.format('let @r = "%s"', str),
      -- <Left> and <Right> don't always work
      '--cmd',
      'cnoremap <C-X> <Left>',
      '--cmd',
      'cnoremap <C-O> <Right>',
      '--cmd',
      'set notermguicolors',
    }, {
      cols = 70,
    })
    screen:set_default_attr_ids({
      [1] = { foreground = 253, background = 11 },
      [2] = { reverse = true },
      [3] = { bold = true },
      [4] = { background = 11 },
      [7] = { foreground = 130 },
    })
    -- Also check for real cursor position, as it is used for stuff like input methods
    screen._handle_busy_start = function() end
    screen._handle_busy_stop = function() end
    screen:expect([[
      {7:  1 }                                                                  |
      {7:  2 }                                                                  |
      {7:  3 }                                                                  |
      {7:  4 }                                                                  |
      {7:  5 }Entering Ex mode.  Type "visual" to go to Normal mode.            |
      {7:  6 }:{2:^ }                                                                |
      {3:-- TERMINAL --}                                                        |
    ]])
  end

  before_each(function()
    clear()
    command('set number')
  end)

  describe('in a line with no multibyte chars or trailing spaces,', function()
    before_each(function()
      setup_ex_register('aaaaaaaa')
    end)

    it('at the end', function()
      feed('<C-R>r')
      screen:expect([[
        {7:  1 }                                                                  |
        {7:  2 }                                                                  |
        {7:  3 }                                                                  |
        {7:  4 }                                                                  |
        {7:  5 }Entering Ex mode.  Type "visual" to go to Normal mode.            |
        {7:  6 }:aaaaaaaa{2:^ }                                                        |
        {3:-- TERMINAL --}                                                        |
      ]])
      eq({ 6, 9 }, eval('nvim_win_get_cursor(0)'))
      feed([[<C-\><C-N>]])
      screen:expect([[
        {7:  1 }                                                                  |
        {7:  2 }                                                                  |
        {7:  3 }                                                                  |
        {7:  4 }                                                                  |
        {7:  5 }Entering Ex mode.  Type "visual" to go to Normal mode.            |
        {7:  6 }:aaaaaaa^a{4: }                                                        |
                                                                              |
      ]])
      eq({ 6, 8 }, eval('nvim_win_get_cursor(0)'))
    end)

    it('near the end', function()
      feed('<C-R>r<C-X><C-X>')
      screen:expect([[
        {7:  1 }                                                                  |
        {7:  2 }                                                                  |
        {7:  3 }                                                                  |
        {7:  4 }                                                                  |
        {7:  5 }Entering Ex mode.  Type "visual" to go to Normal mode.            |
        {7:  6 }:aaaaaa{2:^a}a                                                         |
        {3:-- TERMINAL --}                                                        |
      ]])
      eq({ 6, 7 }, eval('nvim_win_get_cursor(0)'))
      feed([[<C-\><C-N>]])
      screen:expect([[
        {7:  1 }                                                                  |
        {7:  2 }                                                                  |
        {7:  3 }                                                                  |
        {7:  4 }                                                                  |
        {7:  5 }Entering Ex mode.  Type "visual" to go to Normal mode.            |
        {7:  6 }:aaaaa^a{4:a}a                                                         |
                                                                              |
      ]])
      eq({ 6, 6 }, eval('nvim_win_get_cursor(0)'))
    end)

    it('near the start', function()
      feed('<C-R>r<C-B><C-O>')
      screen:expect([[
        {7:  1 }                                                                  |
        {7:  2 }                                                                  |
        {7:  3 }                                                                  |
        {7:  4 }                                                                  |
        {7:  5 }Entering Ex mode.  Type "visual" to go to Normal mode.            |
        {7:  6 }:a{2:^a}aaaaaa                                                         |
        {3:-- TERMINAL --}                                                        |
      ]])
      eq({ 6, 2 }, eval('nvim_win_get_cursor(0)'))
      feed([[<C-\><C-N>]])
      screen:expect([[
        {7:  1 }                                                                  |
        {7:  2 }                                                                  |
        {7:  3 }                                                                  |
        {7:  4 }                                                                  |
        {7:  5 }Entering Ex mode.  Type "visual" to go to Normal mode.            |
        {7:  6 }:^a{4:a}aaaaaa                                                         |
                                                                              |
      ]])
      eq({ 6, 1 }, eval('nvim_win_get_cursor(0)'))
    end)
  end)

  describe('in a line with single-cell multibyte chars and no trailing spaces,', function()
    before_each(function()
      setup_ex_register('µµµµµµµµ')
    end)

    it('at the end', function()
      feed('<C-R>r')
      screen:expect([[
        {7:  1 }                                                                  |
        {7:  2 }                                                                  |
        {7:  3 }                                                                  |
        {7:  4 }                                                                  |
        {7:  5 }Entering Ex mode.  Type "visual" to go to Normal mode.            |
        {7:  6 }:µµµµµµµµ{2:^ }                                                        |
        {3:-- TERMINAL --}                                                        |
      ]])
      eq({ 6, 17 }, eval('nvim_win_get_cursor(0)'))
      feed([[<C-\><C-N>]])
      screen:expect([[
        {7:  1 }                                                                  |
        {7:  2 }                                                                  |
        {7:  3 }                                                                  |
        {7:  4 }                                                                  |
        {7:  5 }Entering Ex mode.  Type "visual" to go to Normal mode.            |
        {7:  6 }:µµµµµµµ^µ{4: }                                                        |
                                                                              |
      ]])
      eq({ 6, 15 }, eval('nvim_win_get_cursor(0)'))
    end)

    it('near the end', function()
      feed('<C-R>r<C-X><C-X>')
      screen:expect([[
        {7:  1 }                                                                  |
        {7:  2 }                                                                  |
        {7:  3 }                                                                  |
        {7:  4 }                                                                  |
        {7:  5 }Entering Ex mode.  Type "visual" to go to Normal mode.            |
        {7:  6 }:µµµµµµ{2:^µ}µ                                                         |
        {3:-- TERMINAL --}                                                        |
      ]])
      eq({ 6, 13 }, eval('nvim_win_get_cursor(0)'))
      feed([[<C-\><C-N>]])
      screen:expect([[
        {7:  1 }                                                                  |
        {7:  2 }                                                                  |
        {7:  3 }                                                                  |
        {7:  4 }                                                                  |
        {7:  5 }Entering Ex mode.  Type "visual" to go to Normal mode.            |
        {7:  6 }:µµµµµ^µ{4:µ}µ                                                         |
                                                                              |
      ]])
      eq({ 6, 11 }, eval('nvim_win_get_cursor(0)'))
    end)

    it('near the start', function()
      feed('<C-R>r<C-B><C-O>')
      screen:expect([[
        {7:  1 }                                                                  |
        {7:  2 }                                                                  |
        {7:  3 }                                                                  |
        {7:  4 }                                                                  |
        {7:  5 }Entering Ex mode.  Type "visual" to go to Normal mode.            |
        {7:  6 }:µ{2:^µ}µµµµµµ                                                         |
        {3:-- TERMINAL --}                                                        |
      ]])
      eq({ 6, 3 }, eval('nvim_win_get_cursor(0)'))
      feed([[<C-\><C-N>]])
      screen:expect([[
        {7:  1 }                                                                  |
        {7:  2 }                                                                  |
        {7:  3 }                                                                  |
        {7:  4 }                                                                  |
        {7:  5 }Entering Ex mode.  Type "visual" to go to Normal mode.            |
        {7:  6 }:^µ{4:µ}µµµµµµ                                                         |
                                                                              |
      ]])
      eq({ 6, 1 }, eval('nvim_win_get_cursor(0)'))
    end)
  end)

  describe('in a line with single-cell composed multibyte chars and no trailing spaces,', function()
    before_each(function()
      setup_ex_register('µ̳µ̳µ̳µ̳µ̳µ̳µ̳µ̳')
    end)

    it('at the end', function()
      feed('<C-R>r')
      screen:expect([[
        {7:  1 }                                                                  |
        {7:  2 }                                                                  |
        {7:  3 }                                                                  |
        {7:  4 }                                                                  |
        {7:  5 }Entering Ex mode.  Type "visual" to go to Normal mode.            |
        {7:  6 }:µ̳µ̳µ̳µ̳µ̳µ̳µ̳µ̳{2:^ }                                                        |
        {3:-- TERMINAL --}                                                        |
      ]])
      eq({ 6, 33 }, eval('nvim_win_get_cursor(0)'))
      feed([[<C-\><C-N>]])
      screen:expect([[
        {7:  1 }                                                                  |
        {7:  2 }                                                                  |
        {7:  3 }                                                                  |
        {7:  4 }                                                                  |
        {7:  5 }Entering Ex mode.  Type "visual" to go to Normal mode.            |
        {7:  6 }:µ̳µ̳µ̳µ̳µ̳µ̳µ̳^µ̳{4: }                                                        |
                                                                              |
      ]])
      eq({ 6, 29 }, eval('nvim_win_get_cursor(0)'))
    end)

    it('near the end', function()
      skip(is_os('win'))
      feed('<C-R>r<C-X><C-X>')
      screen:expect([[
        {7:  1 }                                                                  |
        {7:  2 }                                                                  |
        {7:  3 }                                                                  |
        {7:  4 }                                                                  |
        {7:  5 }Entering Ex mode.  Type "visual" to go to Normal mode.            |
        {7:  6 }:µ̳µ̳µ̳µ̳µ̳µ̳{2:^µ̳}µ̳                                                         |
        {3:-- TERMINAL --}                                                        |
      ]])
      eq({ 6, 25 }, eval('nvim_win_get_cursor(0)'))
      feed([[<C-\><C-N>]])
      screen:expect([[
        {7:  1 }                                                                  |
        {7:  2 }                                                                  |
        {7:  3 }                                                                  |
        {7:  4 }                                                                  |
        {7:  5 }Entering Ex mode.  Type "visual" to go to Normal mode.            |
        {7:  6 }:µ̳µ̳µ̳µ̳µ̳^µ̳{4:µ̳}µ̳                                                         |
                                                                              |
      ]])
      eq({ 6, 21 }, eval('nvim_win_get_cursor(0)'))
    end)

    it('near the start', function()
      skip(is_os('win'))
      feed('<C-R>r<C-B><C-O>')
      screen:expect([[
        {7:  1 }                                                                  |
        {7:  2 }                                                                  |
        {7:  3 }                                                                  |
        {7:  4 }                                                                  |
        {7:  5 }Entering Ex mode.  Type "visual" to go to Normal mode.            |
        {7:  6 }:µ̳{2:^µ̳}µ̳µ̳µ̳µ̳µ̳µ̳                                                         |
        {3:-- TERMINAL --}                                                        |
      ]])
      eq({ 6, 5 }, eval('nvim_win_get_cursor(0)'))
      feed([[<C-\><C-N>]])
      screen:expect([[
        {7:  1 }                                                                  |
        {7:  2 }                                                                  |
        {7:  3 }                                                                  |
        {7:  4 }                                                                  |
        {7:  5 }Entering Ex mode.  Type "visual" to go to Normal mode.            |
        {7:  6 }:^µ̳{4:µ̳}µ̳µ̳µ̳µ̳µ̳µ̳                                                         |
                                                                              |
      ]])
      eq({ 6, 1 }, eval('nvim_win_get_cursor(0)'))
    end)
  end)

  describe('in a line with double-cell multibyte chars and no trailing spaces,', function()
    before_each(function()
      setup_ex_register('哦哦哦哦哦哦哦哦')
    end)

    it('at the end', function()
      feed('<C-R>r')
      screen:expect([[
        {7:  1 }                                                                  |
        {7:  2 }                                                                  |
        {7:  3 }                                                                  |
        {7:  4 }                                                                  |
        {7:  5 }Entering Ex mode.  Type "visual" to go to Normal mode.            |
        {7:  6 }:哦哦哦哦哦哦哦哦{2:^ }                                                |
        {3:-- TERMINAL --}                                                        |
      ]])
      eq({ 6, 25 }, eval('nvim_win_get_cursor(0)'))
      feed([[<C-\><C-N>]])
      screen:expect([[
        {7:  1 }                                                                  |
        {7:  2 }                                                                  |
        {7:  3 }                                                                  |
        {7:  4 }                                                                  |
        {7:  5 }Entering Ex mode.  Type "visual" to go to Normal mode.            |
        {7:  6 }:哦哦哦哦哦哦哦^哦{4: }                                                |
                                                                              |
      ]])
      eq({ 6, 22 }, eval('nvim_win_get_cursor(0)'))
    end)

    it('near the end', function()
      feed('<C-R>r<C-X><C-X>')
      screen:expect([[
        {7:  1 }                                                                  |
        {7:  2 }                                                                  |
        {7:  3 }                                                                  |
        {7:  4 }                                                                  |
        {7:  5 }Entering Ex mode.  Type "visual" to go to Normal mode.            |
        {7:  6 }:哦哦哦哦哦哦{2:^哦}哦                                                 |
        {3:-- TERMINAL --}                                                        |
      ]])
      eq({ 6, 19 }, eval('nvim_win_get_cursor(0)'))
      feed([[<C-\><C-N>]])
      screen:expect([[
        {7:  1 }                                                                  |
        {7:  2 }                                                                  |
        {7:  3 }                                                                  |
        {7:  4 }                                                                  |
        {7:  5 }Entering Ex mode.  Type "visual" to go to Normal mode.            |
        {7:  6 }:哦哦哦哦哦^哦{4:哦}哦                                                 |
                                                                              |
      ]])
      eq({ 6, 16 }, eval('nvim_win_get_cursor(0)'))
    end)

    it('near the start', function()
      feed('<C-R>r<C-B><C-O>')
      screen:expect([[
        {7:  1 }                                                                  |
        {7:  2 }                                                                  |
        {7:  3 }                                                                  |
        {7:  4 }                                                                  |
        {7:  5 }Entering Ex mode.  Type "visual" to go to Normal mode.            |
        {7:  6 }:哦{2:^哦}哦哦哦哦哦哦                                                 |
        {3:-- TERMINAL --}                                                        |
      ]])
      eq({ 6, 4 }, eval('nvim_win_get_cursor(0)'))
      feed([[<C-\><C-N>]])
      screen:expect([[
        {7:  1 }                                                                  |
        {7:  2 }                                                                  |
        {7:  3 }                                                                  |
        {7:  4 }                                                                  |
        {7:  5 }Entering Ex mode.  Type "visual" to go to Normal mode.            |
        {7:  6 }:^哦{4:哦}哦哦哦哦哦哦                                                 |
                                                                              |
      ]])
      eq({ 6, 1 }, eval('nvim_win_get_cursor(0)'))
    end)
  end)

  it('at the end of a line with trailing spaces #16234', function()
    setup_ex_register('aaaaaaaa    ')
    feed('<C-R>r')
    screen:expect([[
      {7:  1 }                                                                  |
      {7:  2 }                                                                  |
      {7:  3 }                                                                  |
      {7:  4 }                                                                  |
      {7:  5 }Entering Ex mode.  Type "visual" to go to Normal mode.            |
      {7:  6 }:aaaaaaaa    {2:^ }                                                    |
      {3:-- TERMINAL --}                                                        |
    ]])
    matches('^:aaaaaaaa    [ ]*$', eval('nvim_get_current_line()'))
    eq({ 6, 13 }, eval('nvim_win_get_cursor(0)'))
    feed([[<C-\><C-N>]])
    screen:expect([[
      {7:  1 }                                                                  |
      {7:  2 }                                                                  |
      {7:  3 }                                                                  |
      {7:  4 }                                                                  |
      {7:  5 }Entering Ex mode.  Type "visual" to go to Normal mode.            |
      {7:  6 }:aaaaaaaa   ^ {4: }                                                    |
                                                                            |
    ]])
    eq({ 6, 12 }, eval('nvim_win_get_cursor(0)'))
  end)
end)