Before:
  let g:ale_buffer_info = {
  \ bufnr(''): {
  \   'loclist': [
  \     {'type': 'E', 'bufnr': bufnr('') - 1, 'lnum': 3, 'col': 2},
  \     {'type': 'E', 'bufnr': bufnr(''), 'lnum': 1, 'col': 2},
  \     {'type': 'E', 'bufnr': bufnr(''), 'lnum': 1, 'col': 3},
  \     {'type': 'W', 'sub_type': 'style', 'bufnr': bufnr(''), 'lnum': 2, 'col': 1},
  \     {'type': 'E', 'bufnr': bufnr(''), 'lnum': 2, 'col': 2},
  \     {'type': 'W', 'sub_type': 'style', 'bufnr': bufnr(''), 'lnum': 2, 'col': 3},
  \     {'type': 'W', 'bufnr': bufnr(''), 'lnum': 2, 'col': 6},
  \     {'type': 'E', 'bufnr': bufnr(''), 'lnum': 2, 'col': 700},
  \     {'type': 'E', 'bufnr': bufnr('') + 1, 'lnum': 3, 'col': 2},
  \   ],
  \ },
  \}

  function! TestJump(position, wrap, filter, subtype_filter, pos)
    call cursor(a:pos)

    if type(a:position) == type(0)
      call ale#loclist_jumping#JumpToIndex(a:position)
    else
      call ale#loclist_jumping#Jump(a:position, a:wrap, a:filter,
      \                             a:subtype_filter)
    endif

    return getcurpos()[1:2]
  endfunction

After:
  let g:ale_buffer_info = {}
  delfunction TestJump

Given foobar (Some imaginary filetype):
  12345678
  12345678

Execute(loclist jumping should jump correctly when not wrapping):
  AssertEqual [2, 1], TestJump('before', 0, 'any', 'any', [2, 2])
  AssertEqual [1, 3], TestJump('before', 0, 'any', 'any', [2, 1])
  AssertEqual [2, 3], TestJump('after', 0, 'any', 'any', [2, 2])
  AssertEqual [2, 1], TestJump('after', 0, 'any', 'any', [1, 3])
  AssertEqual [2, 6], TestJump('after', 0, 'any', 'any', [2, 4])
  AssertEqual [2, 8], TestJump('after', 0, 'any', 'any', [2, 6])

Execute(loclist jumping should jump correctly when wrapping):
  AssertEqual [2, 1], TestJump('before', 1, 'any', 'any', [2, 2])
  AssertEqual [1, 3], TestJump('before', 1, 'any', 'any', [2, 1])
  AssertEqual [2, 3], TestJump('after', 1, 'any', 'any', [2, 2])
  AssertEqual [2, 1], TestJump('after', 1, 'any', 'any', [1, 3])
  AssertEqual [2, 6], TestJump('after', 1, 'any', 'any', [2, 4])

  AssertEqual [1, 2], TestJump('after', 1, 'any', 'any', [2, 8])
  AssertEqual [2, 8], TestJump('before', 1, 'any', 'any', [1, 2])

Execute(loclist jumping should jump correctly with warning filters):
  AssertEqual [2, 1], TestJump('after', 0, 'W', 'any', [1, 2])
  AssertEqual [2, 6], TestJump('after', 0, 'W', 'any', [2, 3])
  AssertEqual [2, 1], TestJump('after', 1, 'W', 'any', [2, 6])

Execute(loclist jumping should jump correctly with error filters):
  AssertEqual [1, 2], TestJump('after', 1, 'E', 'any', [2, 700])
  AssertEqual [2, 2], TestJump('before', 0, 'E', 'any', [2, 700])
  AssertEqual [2, 2], TestJump('after', 1, 'E', 'any', [1, 3])

Execute(loclist jumping should jump correctly with sub type filters):
  AssertEqual [2, 3], TestJump('after', 0, 'any', 'style', [2, 1])
  AssertEqual [2, 2], TestJump('after', 0, 'any', '', [1, 3])
  AssertEqual [2, 1], TestJump('after', 1, 'any', 'style', [2, 6])

Execute(loclist jumping not jump when the loclist is empty):
  let g:ale_buffer_info[bufnr('%')].loclist = []

  AssertEqual [1, 6], TestJump('before', 0, 'any', 'any', [1, 6])
  AssertEqual [1, 6], TestJump('before', 1, 'any', 'any', [1, 6])
  AssertEqual [1, 6], TestJump('after', 0, 'any', 'any', [1, 6])
  AssertEqual [1, 6], TestJump('after', 1, 'any', 'any', [1, 6])

Execute(We should be able to jump to the last item):
  AssertEqual [2, 8], TestJump(-1, 0, 'any', 'any', [1, 6])

Execute(We shouldn't move when jumping to the last item where there are none):
  let g:ale_buffer_info[bufnr('%')].loclist = []

  AssertEqual [1, 6], TestJump(-1, 0, 'any', 'any', [1, 6])

Execute(We should be able to jump to the first item):
  AssertEqual [1, 2], TestJump(0, 0, 'any', 'any', [1, 6])

Execute(We shouldn't move when jumping to the first item where there are none):
  let g:ale_buffer_info[bufnr('%')].loclist = []

  AssertEqual [1, 6], TestJump(0, 0, 'any', 'any', [1, 6])

Execute(We should be able to jump when the error line is blank):
  " Add a blank line at the end.
  call setline(1, getline('.', '$') + [''])
  " Add a problem on the blank line.
  call add(g:ale_buffer_info[bufnr('%')].loclist, {'type': 'E', 'bufnr': bufnr(''), 'lnum': 3, 'col': 1})

  AssertEqual 0, len(getline(3))
  AssertEqual [2, 8], TestJump('before', 0, 'any', 'any', [3, 1])
  AssertEqual [2, 8], TestJump('before', 1, 'any', 'any', [3, 1])
  AssertEqual [3, 1], TestJump('after', 0, 'any', 'any', [3, 1])
  AssertEqual [1, 2], TestJump('after', 1, 'any', 'any', [3, 1])

Execute(ALE should jump to column 1 instead of 0):
  let g:ale_buffer_info = {
  \ bufnr(''): {
  \   'loclist': [
  \     {'type': 'E', 'bufnr': bufnr(''), 'lnum': 1, 'col': 5},
  \     {'type': 'E', 'bufnr': bufnr(''), 'lnum': 2, 'col': 0},
  \   ],
  \ },
  \}

  AssertEqual [2, 1], TestJump('after', 1, 'any', 'any', [1, 5])
  AssertEqual [1, 5], TestJump('after', 1, 'any', 'any', [2, 1])
  AssertEqual [2, 1], TestJump('before', 1, 'any', 'any', [1, 5])
  AssertEqual [1, 5], TestJump('before', 1, 'any', 'any', [2, 1])