Before:
  Save g:ale_buffer_info
  Save g:ale_virtualtext_cursor
  Save g:ale_virtualtext_delay
  Save g:ale_virtualtext_prefix
  Save b:ale_virtualtext_prefix

  call ale#virtualtext#ResetDataForTests()

  let g:setting = ''
  let g:ale_virtualtext_delay = 0
  let g:ale_buffer_info = {
  \ bufnr(''): {
  \   'loclist': [
  \     {
  \       'bufnr': bufnr(''),
  \       'type': 'E',
  \       'lnum': 1,
  \       'col': 5,
  \       'text': 'Line 1 error',
  \     },
  \     {
  \       'bufnr': bufnr(''),
  \       'type': 'W',
  \       'lnum': 2,
  \       'col': 1,
  \       'text': 'Line 2 warning 1',
  \     },
  \     {
  \       'bufnr': bufnr(''),
  \       'type': 'W',
  \       'lnum': 2,
  \       'col': 5,
  \       'text': 'Line 2 warning 2',
  \     },
  \   ],
  \ },
  \}

After:
  Restore

  unlet! g:setting
  unlet! g:ns_id

Execute(The correct highlight groups should be loaded for virtual-text):
  AssertEqual 'ALEVirtualTextError', ale#virtualtext#GetGroup({})
  AssertEqual 'ALEVirtualTextError', ale#virtualtext#GetGroup({'type': 'E'})
  AssertEqual 'ALEVirtualTextStyleError',
  \ ale#virtualtext#GetGroup({'type': 'E', 'sub_type': 'style'})
  AssertEqual 'ALEVirtualTextWarning', ale#virtualtext#GetGroup({'type': 'W'})
  AssertEqual 'ALEVirtualTextStyleWarning',
  \ ale#virtualtext#GetGroup({'type': 'W', 'sub_type': 'style'})
  AssertEqual 'ALEVirtualTextInfo', ale#virtualtext#GetGroup({'type': 'I'})

Given python (An empty Python file):
Execute(Comment text should be detected correctly for Python files):
  if has('patch-9.0.0297') || has('nvim-0.8.0')
    AssertEqual '#', ale#virtualtext#GetComment(bufnr(''))
  endif

Given java (An empty Java file):
Execute(Comment text should be detected correctly for Java files):
  if has('patch-9.0.0297') || has('nvim-0.8.0')
    AssertEqual '//', ale#virtualtext#GetComment(bufnr(''))
  endif

Given html (An empty HTML file):
Execute(Comment text should be detected correctly for HTML files):
  if has('patch-9.0.0297') || has('nvim-0.8.0')
    AssertEqual "\<!--", ale#virtualtext#GetComment(bufnr(''))
  endif

Given python(An example Python file):
  # line 1
  # line 2

Execute(We should not show virtualtext when disabled):
  if has('patch-9.0.0297') || has('nvim-0.8.0')
    for g:setting in ['disabled', '0', 0]
      call ale#virtualtext#ResetDataForTests()

      let g:ale_virtualtext_cursor = g:setting
      call cursor(1, 1)
      call ale#virtualtext#ShowCursorWarningWithDelay()
      " Tick the timer.
      sleep 1ms

      AssertEqual '', ale#virtualtext#GetLastMessageForTests()
    endfor
  endif

Execute(We should find a virtualtext error on line 1):
  if has('patch-9.0.0297') || has('nvim-0.8.0')
    for g:setting in ['current', '1', 1]
      call ale#virtualtext#ResetDataForTests()

      let g:ale_virtualtext_cursor = 'current'
      call cursor(1, 1)
      call ale#virtualtext#ShowCursorWarningWithDelay()
      " Tick the timer.
      sleep 1ms

      AssertEqual '# E: Line 1 error', ale#virtualtext#GetLastMessageForTests()

      if has('patch-9.0.0297')
        AssertEqual ['ALEVirtualTextError'], map(prop_list(1), {_, v -> v.type})
        AssertEqual [], prop_list(2)
      endif
    endfor
  endif

Execute(We should find a virtualtext error on line 2):
  if has('patch-9.0.0297') || has('nvim-0.8.0')
    let g:ale_virtualtext_cursor = 'current'
    call cursor(2, 5)
    call ale#virtualtext#ShowCursorWarningWithDelay()
    " Tick the timer.
    sleep 1ms

    AssertEqual '# W: Line 2 warning 2', ale#virtualtext#GetLastMessageForTests()

    if has('patch-9.0.0297')
      AssertEqual [], prop_list(1)
      AssertEqual ['ALEVirtualTextWarning'], map(prop_list(2), {_, v -> v.type})
    endif
  endif

Execute(We should be able to change the virtualtext prefix globally):
  let g:ale_virtualtext_prefix = '> '

  if has('patch-9.0.0297') || has('nvim-0.8.0')
    let g:ale_virtualtext_cursor = 'current'
    call cursor(1, 1)
    call ale#virtualtext#ShowCursorWarningWithDelay()
    " Tick the timer.
    sleep 1ms

    AssertEqual '> Line 1 error', ale#virtualtext#GetLastMessageForTests()
  endif

Execute(We should be able to change the virtualtext prefix per-buffer):
  let b:ale_virtualtext_prefix = 'B> '

  if has('patch-9.0.0297') || has('nvim-0.8.0')
    let g:ale_virtualtext_cursor = 'current'
    call cursor(1, 1)
    call ale#virtualtext#ShowCursorWarningWithDelay()
    " Tick the timer.
    sleep 1ms

    AssertEqual 'B> Line 1 error', ale#virtualtext#GetLastMessageForTests()
  endif

Execute(We should be format in other data from the loclist items):
  let g:ale_virtualtext_prefix = '%severity%: '

  if has('patch-9.0.0297') || has('nvim-0.8.0')
    let g:ale_virtualtext_cursor = 'current'
    call cursor(1, 1)
    call ale#virtualtext#ShowCursorWarningWithDelay()
    " Tick the timer.
    sleep 1ms

    AssertEqual 'Error: Line 1 error', ale#virtualtext#GetLastMessageForTests()
  endif

Execute(We should set errors across all lines):
  if has('patch-9.0.0297') || has('nvim-0.8.0')
    call ale#virtualtext#SetTexts(bufnr(''), g:ale_buffer_info[bufnr('')].loclist)

    AssertEqual '# W: Line 2 warning 2', ale#virtualtext#GetLastMessageForTests()

    if has('patch-9.0.0297')
      AssertEqual ['ALEVirtualTextError'], map(prop_list(1), {_, v -> v.type})
      AssertEqual ['ALEVirtualTextWarning', 'ALEVirtualTextWarning'],
      \ map(prop_list(2), {_, v -> v.type})
    endif
  endif