Before:
  runtime autoload/ale/lsp.vim

  let g:conn_id = ale#lsp#Register('executable', '/foo/bar', {})

  " Stub out this function, so we test updating configs.
  function! ale#lsp#Send(conn_id, message) abort
  endfunction

After:
  Restore

  unlet! g:conn_id

  runtime autoload/ale/lsp.vim

Execute(Only send updates when the configuration dictionary changes):
  AssertEqual 0, ale#lsp#UpdateConfig(g:conn_id, bufnr(''), {})
  AssertEqual 1, ale#lsp#UpdateConfig(g:conn_id, bufnr(''), {'a': 1})
  AssertEqual 0, ale#lsp#UpdateConfig(g:conn_id, bufnr(''), {'a': 1})
  AssertEqual 1, ale#lsp#UpdateConfig(g:conn_id, bufnr(''), {})