Before:
  call ale#test#SetDirectory('/testplugin/test')

  let g:new_line_test_file = tempname()

After:
  noautocmd :e! ++ff=unix
  setlocal buftype=nofile

  if filereadable(g:new_line_test_file)
    call delete(g:new_line_test_file)
  endif

  unlet! g:new_line_test_file

  call ale#test#RestoreDirectory()

Given(A file with Windows line ending characters):
  first
  second
  third

Execute(Carriage returns should be included for ale#util#Writefile):
  call ale#test#SetFilename(g:new_line_test_file)

  setlocal buftype=
  noautocmd :w
  noautocmd :e! ++ff=dos

  call ale#util#Writefile(bufnr(''), getline(1, '$'), g:new_line_test_file)

  AssertEqual
  \ ["first\r", "second\r", "third\r", ''],
  \ readfile(g:new_line_test_file, 'b')

Given(A file with extra carriage returns):
  first

  second


  third
  fourth

Execute(Carriage returns should be de-depulicated):
  call ale#test#SetFilename(g:new_line_test_file)

  setlocal buftype=
  noautocmd :w
  noautocmd :e! ++ff=dos

  call ale#util#Writefile(bufnr(''), getline(1, '$'), g:new_line_test_file)

  AssertEqual
  \ ["first\r", "second\r", "third\r", "fourth\r", ''],
  \ readfile(g:new_line_test_file, 'b')

Given(A file with Unix line ending characters):
  first
  second
  third

Execute(Unix file lines should be written as normal):
  call ale#test#SetFilename(g:new_line_test_file)

  setlocal buftype=
  noautocmd :w
  noautocmd :e! ++ff=unix

  call ale#util#Writefile(bufnr(''), getline(1, '$'), g:new_line_test_file)

  AssertEqual
  \ ['first', 'second', 'third', ''],
  \ readfile(g:new_line_test_file, 'b')

Execute(Newline at end of file should be preserved even when nofixeol):
  call ale#test#SetFilename(g:new_line_test_file)

  setlocal buftype=
  noautocmd :w
  noautocmd :e! ++ff=unix
  set eol
  set nofixeol

  call ale#util#Writefile(bufnr(''), getline(1, '$'), g:new_line_test_file)

  AssertEqual
  \ ['first', 'second', 'third', ''],
  \ readfile(g:new_line_test_file, 'b')

Execute(Newline should not be appended on write when noeol and nofixeol):
  call ale#test#SetFilename(g:new_line_test_file)

  setlocal buftype=
  noautocmd :w
  noautocmd :e! ++ff=unix
  set noeol
  set nofixeol

  call ale#util#Writefile(bufnr(''), getline(1, '$'), g:new_line_test_file)

  AssertEqual
  \ ['first', 'second', 'third'],
  \ readfile(g:new_line_test_file, 'b')

Execute(Newline should be appended on write when noeol and fixeol):
  call ale#test#SetFilename(g:new_line_test_file)

  setlocal buftype=
  noautocmd :w
  noautocmd :e! ++ff=unix
  set noeol
  set fixeol

  call ale#util#Writefile(bufnr(''), getline(1, '$'), g:new_line_test_file)

  AssertEqual
  \ ['first', 'second', 'third', ''],
  \ readfile(g:new_line_test_file, 'b')