Before:
  call ale#test#SetDirectory('/testplugin/test')
  call ale#test#SetFilename('dummy.txt')

  let g:Callback = ''
  let g:expr_list = []
  let g:message_list = []
  let g:preview_called = 0
  let g:item_list = []
  let g:capability_checked = ''
  let g:conn_id = v:null
  let g:WaitCallback = v:null

  runtime autoload/ale/lsp_linter.vim
  runtime autoload/ale/lsp.vim
  runtime autoload/ale/util.vim
  runtime autoload/ale/preview.vim

  function! ale#lsp_linter#StartLSP(buffer, linter) abort
    let g:conn_id = ale#lsp#Register('executable', '/foo/bar', {})
    call ale#lsp#MarkDocumentAsOpen(g:conn_id, a:buffer)

    return {
    \ 'buffer': a:buffer,
    \ 'connection_id': g:conn_id,
    \ 'project_root': '/foo/bar',
    \ 'language_id': 'python',
    \}
  endfunction

  function! ale#lsp#WaitForCapability(conn_id, capability, callback) abort
    let g:capability_checked = a:capability
    let g:WaitCallback = a:callback
  endfunction

  function! ale#lsp#RegisterCallback(conn_id, callback) abort
    let g:Callback = a:callback
  endfunction

  function! ale#lsp#Send(conn_id, message) abort
    call add(g:message_list, a:message)

    return 42
  endfunction

  function! ale#util#Execute(expr) abort
    call add(g:expr_list, a:expr)
  endfunction

  function! ale#preview#ShowSelection(item_list) abort
    let g:preview_called = 1
    let g:item_list = a:item_list
  endfunction

After:
  call ale#test#RestoreDirectory()
  call ale#linter#Reset()

  unlet! g:capability_checked
  unlet! g:WaitCallback
  unlet! g:conn_id
  unlet! g:Callback
  unlet! g:message_list
  unlet! g:expr_list
  unlet! b:ale_linters
  unlet! g:item_list
  unlet! g:preview_called

  runtime autoload/ale/lsp_linter.vim
  runtime autoload/ale/lsp.vim
  runtime autoload/ale/util.vim
  runtime autoload/ale/preview.vim

Execute(Other messages for the LSP handler should be ignored):
  call ale#symbol#HandleLSPResponse(1, {'command': 'foo'})

Execute(Failed symbol responses should be handled correctly):
  call ale#symbol#SetMap({3: {}})
  call ale#symbol#HandleLSPResponse(1, {'id': 3})
  AssertEqual {}, ale#symbol#GetMap()

Execute(LSP symbol responses should be handled):
  call ale#symbol#SetMap({3: {}})
  call ale#symbol#HandleLSPResponse(
  \ 1,
  \ {
  \   'id': 3,
  \   'result': [
  \     {
  \       'name': 'foo',
  \       'location': {
  \         'uri': ale#path#ToURI(ale#path#Simplify(g:dir . '/completion_dummy_file')),
  \         'range': {
  \           'start': {'line': 2, 'character': 7},
  \         },
  \       },
  \     },
  \     {
  \       'name': 'foobar',
  \       'location': {
  \         'uri': ale#path#ToURI(ale#path#Simplify(g:dir . '/other_file')),
  \         'range': {
  \           'start': {'line': 7, 'character': 15},
  \         },
  \       },
  \     },
  \   ],
  \ }
  \)

  AssertEqual
  \ [
  \   {
  \     'filename': ale#path#Simplify(g:dir . '/completion_dummy_file'),
  \     'line': 3,
  \     'column': 8,
  \     'match': 'foo',
  \   },
  \   {
  \     'filename': ale#path#Simplify(g:dir . '/other_file'),
  \     'line': 8,
  \     'column': 16,
  \     'match': 'foobar',
  \   },
  \ ],
  \ g:item_list
  AssertEqual {}, ale#symbol#GetMap()

Execute(Preview windows should not be opened for empty LSP symbol responses):
  call ale#symbol#SetMap({3: {}})
  call ale#symbol#HandleLSPResponse(
  \ 1,
  \ {
  \   'id': 3,
  \   'result': [
  \   ],
  \ }
  \)

  Assert !g:preview_called
  AssertEqual {}, ale#symbol#GetMap()
  AssertEqual ['echom ''No symbols found.'''], g:expr_list

Given python(Some Python file):
  foo
  somelongerline
  bazxyzxyzxyz

Execute(LSP symbol requests should be sent):
  runtime ale_linters/python/pyls.vim
  let b:ale_linters = ['pyls']
  call setpos('.', [bufnr(''), 1, 5, 0])

  ALESymbolSearch foo bar

  " We shouldn't register the callback yet.
  AssertEqual '''''', string(g:Callback)

  AssertEqual 'symbol_search', g:capability_checked
  AssertEqual type(function('type')), type(g:WaitCallback)
  call call(g:WaitCallback, [g:conn_id, '/foo/bar'])

  AssertEqual
  \ 'function(''ale#symbol#HandleLSPResponse'')',
  \ string(g:Callback)

  AssertEqual
  \ [
  \   [0, 'workspace/symbol', {'query': 'foo bar'}],
  \ ],
  \ g:message_list

  AssertEqual {'42': {'buffer': bufnr('')}}, ale#symbol#GetMap()