neovim/test/functional/ex_cmds/drop_spec.lua

local helpers = require('test.functional.helpers')(after_each)
local command = helpers.command
local Screen = require('test.functional.ui.screen')
local clear, feed, feed_command = helpers.clear, helpers.feed, helpers.feed_command
local exec = helpers.exec

describe(':drop', function()
  local screen

  before_each(function()
    clear()
    screen = Screen.new(35, 10)
    screen:attach()
    screen:set_default_attr_ids({
      [0] = { bold = true, foreground = Screen.colors.Blue },
      [1] = { bold = true, reverse = true },
      [2] = { reverse = true },
      [3] = { bold = true },
    })
    command('set nohidden laststatus=2 shortmess-=F')
  end)

  it('works like :e when called with only one window open', function()
    feed_command('drop tmp1.vim')
    screen:expect([[
      ^                                   |
      {0:~                                  }|*7
      {1:tmp1.vim                           }|
      "tmp1.vim" [New]                   |
    ]])
  end)

  it('switches to an open window showing the buffer', function()
    feed_command('edit tmp1')
    feed_command('vsplit')
    feed_command('edit tmp2')
    feed_command('drop tmp1')
    screen:expect([[
                    │^                    |
      {0:~             }│{0:~                   }|*7
      {2:tmp2           }{1:tmp1                }|
      "tmp1" [New]                       |
    ]])
  end)

  it("splits off a new window when a buffer can't be abandoned", function()
    feed_command('edit tmp1')
    feed_command('vsplit')
    feed_command('edit tmp2')
    feed('iABC<esc>')
    feed_command('drop tmp3')
    screen:expect([[
      ^                    │              |
      {0:~                   }│{0:~             }|*3
      {1:tmp3                }│{0:~             }|
      ABC                 │{0:~             }|
      {0:~                   }│{0:~             }|*2
      {2:tmp2 [+]             tmp1          }|
      "tmp3" [New]                       |
    ]])
  end)

  -- oldtest: Test_drop_modified_file()
  it('does not cause E37 with modified same file', function()
    exec([[
      edit Xdrop_modified.txt
      call setline(1, 'The quick brown fox jumped over the lazy dogs')
    ]])
    feed_command('drop Xdrop_modified.txt')
    screen:expect([[
      ^The quick brown fox jumped over the|
       lazy dogs                         |
      {0:~                                  }|*6
      {1:Xdrop_modified.txt [+]             }|
      :drop Xdrop_modified.txt           |
    ]])
  end)
end)