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Before:
  Save g:ale_completion_delay
  Save g:ale_completion_max_suggestions
  Save g:ale_completion_info
  Save g:ale_completion_experimental_lsp_support
  Save &l:omnifunc
  Save &l:completeopt

  unlet! g:ale_completion_experimental_lsp_support

  let g:ale_completion_enabled = 1

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

  runtime autoload/ale/lsp.vim

  let g:message_list = []
  let g:Callback = ''

  function! ale#linter#StartLSP(buffer, linter, callback) abort
    let g:Callback = a:callback

    return {
    \ 'connection_id': 347,
    \ 'project_root': '/foo/bar',
    \}
  endfunction

  " Replace the Send function for LSP, so we can monitor calls to it.
  function! ale#lsp#Send(conn_id, message, ...) abort
    call add(g:message_list, a:message)
  endfunction

After:
  Restore

  unlet! g:message_list
  unlet! g:Callback
  unlet! b:ale_old_omnifunc
  unlet! b:ale_old_completopt
  unlet! b:ale_completion_info
  unlet! b:ale_completion_response
  unlet! b:ale_completion_parser
  unlet! b:ale_complete_done_time
  unlet! b:ale_linters
  unlet! g:ale_completion_experimental_lsp_support

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

  " Stop any timers we left behind.
  " This stops the tests from failing randomly.
  call ale#completion#StopTimer()

  runtime autoload/ale/completion.vim
  runtime autoload/ale/lsp.vim

Given typescript(Some typescript file):
  foo
  somelongerline
  bazxyzxyzxyz

Execute(The right message should be sent for the initial tsserver request):
  runtime ale_linters/typescript/tsserver.vim
  let b:ale_linters = ['tsserver']
  " The cursor position needs to match what was saved before.
  call setpos('.', [bufnr(''), 1, 3, 0])

  call ale#completion#GetCompletions()

  " We should send the right callback.
  AssertEqual
  \ 'function(''ale#completion#HandleTSServerResponse'')',
  \ string(g:Callback)
  " We should send the right message.
  AssertEqual
  \ [[0, 'ts@completions', {'file': expand('%:p'), 'line': 1, 'offset': 3, 'prefix': 'fo'}]],
  \ g:message_list
  " We should set up the completion info correctly.
  AssertEqual
  \ {
  \   'line_length': 3,
  \   'conn_id': 0,
  \   'column': 3,
  \   'request_id': 0,
  \   'line': 1,
  \   'prefix': 'fo',
  \ },
  \ get(b:, 'ale_completion_info', {})

Execute(The right message sent to the tsserver LSP when the first completion message is received):
  " The cursor position needs to match what was saved before.
  call setpos('.', [bufnr(''), 1, 1, 0])
  let b:ale_completion_info = {
  \ 'conn_id': 123,
  \ 'prefix': 'f',
  \ 'request_id': 4,
  \ 'line': 1,
  \ 'column': 1,
  \}
  " We should only show up to this many suggestions.
  let g:ale_completion_max_suggestions = 3

  " Handle the response for completions.
  call ale#completion#HandleTSServerResponse(123, {
  \ 'request_seq': 4,
  \ 'command': 'completions',
  \ 'body': [
  \   {'name': 'Baz'},
  \   {'name': 'dingDong'},
  \   {'name': 'Foo'},
  \   {'name': 'FooBar'},
  \   {'name': 'frazzle'},
  \   {'name': 'FFS'},
  \ ],
  \})

  " The entry details messages should have been sent.
  AssertEqual
  \ [[
  \   0,
  \   'ts@completionEntryDetails',
  \   {
  \     'file': expand('%:p'),
  \     'entryNames': ['Foo', 'FooBar', 'frazzle'],
  \     'offset': 1,
  \     'line': 1,
  \   },
  \ ]],
  \ g:message_list

Given python(Some Python file):
  foo
  somelongerline
  bazxyzxyzxyz

Execute(The right message should be sent for the initial LSP request):
  let g:ale_completion_experimental_lsp_support = 1

  runtime ale_linters/python/pyls.vim
  let b:ale_linters = ['pyls']
  " The cursor position needs to match what was saved before.
  call setpos('.', [bufnr(''), 1, 5, 0])

  call ale#completion#GetCompletions()

  " We should send the right callback.
  AssertEqual
  \ 'function(''ale#completion#HandleLSPResponse'')',
  \ string(g:Callback)
  " We should send the right message.
  " The character index needs to be at most the index of the last character on
  " the line, or integration with pyls will be broken.
  "
  " We need to send the message for changing the document first.
  AssertEqual
  \ [
  \   [1, 'textDocument/didChange', {
  \     'textDocument': {
  \         'uri': ale#path#ToURI(expand('%:p')),
  \         'version': g:ale_lsp_next_version_id - 1,
  \     },
  \     'contentChanges': [{'text': join(getline(1, '$'), "\n") . "\n"}]
  \   }],
  \   [0, 'textDocument/completion', {
  \   'textDocument': {'uri': ale#path#ToURI(expand('%:p'))},
  \   'position': {'line': 0, 'character': 3},
  \   }],
  \ ],
  \ g:message_list
  " We should set up the completion info correctly.
  AssertEqual
  \ {
  \   'line_length': 3,
  \   'conn_id': 0,
  \   'column': 3,
  \   'request_id': 0,
  \   'line': 1,
  \   'prefix': 'fo',
  \ },
  \ get(b:, 'ale_completion_info', {})