neovim/test/functional/lua/ui_spec.lua

local helpers = require('test.functional.helpers')(after_each)
local eq = helpers.eq
local matches = helpers.matches
local exec_lua = helpers.exec_lua
local clear = helpers.clear
local feed = helpers.feed
local eval = helpers.eval
local poke_eventloop = helpers.poke_eventloop

describe('vim.ui', function()
  before_each(function()
    clear()
  end)

  describe('select()', function()
    it('can select an item', function()
      local result = exec_lua[[
        local items = {
          { name = 'Item 1' },
          { name = 'Item 2' },
        }
        local opts = {
          format_item = function(entry)
            return entry.name
          end
        }
        local selected
        local cb = function(item)
          selected = item
        end
        -- inputlist would require input and block the test;
        local choices
        vim.fn.inputlist = function(x)
          choices = x
          return 1
        end
        vim.ui.select(items, opts, cb)
        vim.wait(100, function() return selected ~= nil end)
        return {selected, choices}
      ]]
      eq({ name = 'Item 1' }, result[1])
      eq({
        'Select one of:',
        '1: Item 1',
        '2: Item 2',
      }, result[2])
    end)
  end)

  describe('input()', function()
    it('can input text', function()
      local result = exec_lua[[
        local opts = {
            prompt = 'Input: ',
        }
        local input
        local cb = function(item)
          input = item
        end
        -- input would require input and block the test;
        local prompt
        vim.fn.input = function(opts)
          prompt = opts.prompt
          return "Inputted text"
        end
        vim.ui.input(opts, cb)
        vim.wait(100, function() return input ~= nil end)
        return {input, prompt}
      ]]
      eq('Inputted text', result[1])
      eq('Input: ', result[2])
    end)

    it('can input text on nil opt', function()
      feed(':lua vim.ui.input(nil, function(input) result = input end)<cr>')
      eq('', eval('v:errmsg'))
      feed('Inputted text<cr>')
      eq('Inputted text', exec_lua('return result'))
    end)

    it('can input text on {} opt', function()
      feed(':lua vim.ui.input({}, function(input) result = input end)<cr>')
      eq('', eval('v:errmsg'))
      feed('abcdefg<cr>')
      eq('abcdefg', exec_lua('return result'))
    end)

    it('can input empty text #18144', function()
      feed(':lua vim.ui.input({}, function(input) result = input end)<cr>')
      feed('<cr>')
      eq('', exec_lua('return result'))
    end)

    it('can input empty text with cancelreturn opt #18144', function()
      feed(':lua vim.ui.input({ cancelreturn = "CANCEL" }, function(input) result = input end)<cr>')
      feed('<cr>')
      eq('', exec_lua('return result'))
    end)

    it('can return nil when aborted with ESC #18144', function()
      feed(':lua result = "on_confirm not called"<cr>')
      feed(':lua vim.ui.input({}, function(input) result = input end)<cr>')
      feed('Inputted Text<esc>')
      -- Note: When `result == nil`, exec_lua('returns result') returns vim.NIL
      eq(true, exec_lua('return (nil == result)'))
    end)

    it('can return opts.cacelreturn when aborted with ESC with cancelreturn opt #18144', function()
      feed(':lua result = "on_confirm not called"<cr>')
      feed(':lua vim.ui.input({ cancelreturn = "CANCEL" }, function(input) result = input end)<cr>')
      feed('Inputted Text<esc>')
      eq('CANCEL', exec_lua('return result'))
    end)

    it('can return nil when interrupted with Ctrl-C #18144', function()
      feed(':lua result = "on_confirm not called"<cr>')
      feed(':lua vim.ui.input({}, function(input) result = input end)<cr>')
      poke_eventloop()  -- This is needed because Ctrl-C flushes input
      feed('Inputted Text<c-c>')
      eq(true, exec_lua('return (nil == result)'))
    end)

    it('can return the identical object when an arbitrary opts.cancelreturn object is given', function()
      feed(':lua fn = function() return 42 end<CR>')
      eq(42, exec_lua('return fn()'))
      feed(':lua vim.ui.input({ cancelreturn = fn }, function(input) result = input end)<cr>')
      feed('cancel<esc>')
      eq(true, exec_lua('return (result == fn)'))
      eq(42, exec_lua('return result()'))
    end)

  end)

  describe('open()', function()
    it('validation', function()
      exec_lua[[vim.ui.open('non-existent-file')]]
      matches('vim.ui.open: command failed %(%d%): { "[^"]+", "non%-existent%-file" }', eval('v:errmsg'))

      exec_lua[[
        vim.fn.has = function() return 0 end
        vim.fn.executable = function() return 0 end
      ]]
      exec_lua[[vim.ui.open('foo')]]
      eq('vim.ui.open: no handler found (tried: wslview, xdg-open)', eval('v:errmsg'))
    end)
  end)
end)