Before:
  runtime autoload/ale/lsp.vim

  let g:message_list = []
  let b:conn = {
  \ 'id': 1,
  \ 'is_tsserver': 0,
  \ 'data': '',
  \ 'root': '/foo/bar',
  \ 'open_documents': {},
  \ 'initialized': 0,
  \ 'init_request_id': 0,
  \ 'init_options': {},
  \ 'config': {},
  \ 'callback_list': [],
  \ 'message_queue': [],
  \ 'init_queue': [],
  \ 'capabilities': {
  \   'hover': 0,
  \   'rename': 0,
  \   'references': 0,
  \   'completion': 0,
  \   'completion_trigger_characters': [],
  \   'definition': 0,
  \   'symbol_search': 0,
  \   'code_actions': 0,
  \ },
  \}

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

    return 42
  endfunction

After:
  unlet! b:conn
  unlet! g:message_list

  runtime autoload/ale/lsp.vim

Execute(Messages with no method and capabilities should initialize projects):
  call ale#lsp#HandleInitResponse(b:conn, {
  \ 'result': {'capabilities': {}},
  \})

  AssertEqual 1, b:conn.initialized
  AssertEqual [[1, 'initialized', {}]], g:message_list

Execute(Other messages should not initialize projects):
  call ale#lsp#HandleInitResponse(b:conn, {'method': 'lolwat'})

  AssertEqual 0, b:conn.initialized
  AssertEqual [], g:message_list

  call ale#lsp#HandleInitResponse(b:conn, {'result': {'x': {}}})

  AssertEqual 0, b:conn.initialized
  AssertEqual [], g:message_list

Execute(Capabilities should bet set up correctly):
  call ale#lsp#HandleInitResponse(b:conn, {
  \ 'jsonrpc': '2.0',
  \ 'id': 1,
  \ 'result': {
  \   'capabilities': {
  \     'renameProvider': v:true,
  \     'executeCommandProvider': {
  \       'commands': [],
  \     },
  \     'hoverProvider': v:true,
  \     'documentSymbolProvider': v:true,
  \     'documentRangeFormattingProvider': v:true,
  \     'codeLensProvider': {
  \       'resolveProvider': v:false
  \     },
  \     'referencesProvider': v:true,
  \     'textDocumentSync': 2,
  \     'documentFormattingProvider': v:true,
  \     'codeActionProvider': v:true,
  \     'signatureHelpProvider': {
  \       'triggerCharacters': ['(', ','],
  \     },
  \     'completionProvider': {
  \       'triggerCharacters': ['.'],
  \       'resolveProvider': v:false
  \     },
  \     'definitionProvider': v:true,
  \     'experimental': {},
  \     'documentHighlightProvider': v:true,
  \     'workspaceSymbolProvider': v:true
  \   },
  \ },
  \})

  AssertEqual 1, b:conn.initialized
  AssertEqual
  \ {
  \   'completion_trigger_characters': ['.'],
  \   'completion': 1,
  \   'references': 1,
  \   'hover': 1,
  \   'definition': 1,
  \   'symbol_search': 1,
  \   'rename': 1,
  \   'code_actions': 1,
  \ },
  \ b:conn.capabilities
  AssertEqual [[1, 'initialized', {}]], g:message_list

Execute(Disabled capabilities should be recognised correctly):
  call ale#lsp#HandleInitResponse(b:conn, {
  \ 'jsonrpc': '2.0',
  \ 'id': 1,
  \ 'result': {
  \   'capabilities': {
  \     'renameProvider': v:false,
  \     'executeCommandProvider': {
  \       'commands': [],
  \     },
  \     'hoverProvider': v:false,
  \     'documentSymbolProvider': v:true,
  \     'documentRangeFormattingProvider': v:true,
  \     'codeLensProvider': {
  \       'resolveProvider': v:false
  \     },
  \     'referencesProvider': v:false,
  \     'textDocumentSync': 2,
  \     'documentFormattingProvider': v:true,
  \     'codeActionProvider': v:false,
  \     'signatureHelpProvider': {
  \       'triggerCharacters': ['(', ','],
  \     },
  \     'definitionProvider': v:false,
  \     'experimental': {},
  \     'documentHighlightProvider': v:true,
  \   },
  \ },
  \})

  AssertEqual 1, b:conn.initialized
  AssertEqual
  \ {
  \   'completion_trigger_characters': [],
  \   'completion': 0,
  \   'references': 0,
  \   'hover': 0,
  \   'definition': 0,
  \   'symbol_search': 0,
  \   'rename': 0,
  \   'code_actions': 0,
  \ },
  \ b:conn.capabilities
  AssertEqual [[1, 'initialized', {}]], g:message_list

Execute(Capabilities should be enabled when send as Dictionaries):
  call ale#lsp#HandleInitResponse(b:conn, {
  \ 'jsonrpc': '2.0',
  \ 'id': 1,
  \ 'result': {
  \   'capabilities': {
  \     'renameProvider': {},
  \     'executeCommandProvider': {
  \       'commands': [],
  \     },
  \     'hoverProvider': {},
  \     'documentSymbolProvider': v:true,
  \     'documentRangeFormattingProvider': v:true,
  \     'codeLensProvider': {
  \       'resolveProvider': v:false
  \     },
  \     'completionProvider': {
  \       'triggerCharacters': ['.'],
  \       'resolveProvider': v:false
  \     },
  \     'referencesProvider': {},
  \     'textDocumentSync': 2,
  \     'documentFormattingProvider': v:true,
  \     'codeActionProvider': v:true,
  \     'signatureHelpProvider': {
  \       'triggerCharacters': ['(', ','],
  \     },
  \     'definitionProvider': {},
  \     'typeDefinitionProvider': {},
  \     'experimental': {},
  \     'documentHighlightProvider': v:true,
  \     'workspaceSymbolProvider': {}
  \   },
  \ },
  \})

  AssertEqual 1, b:conn.initialized
  AssertEqual
  \ {
  \   'completion_trigger_characters': ['.'],
  \   'completion': 1,
  \   'references': 1,
  \   'hover': 1,
  \   'definition': 1,
  \   'typeDefinition': 1,
  \   'symbol_search': 1,
  \   'rename': 1,
  \   'code_actions': 1,
  \ },
  \ b:conn.capabilities
  AssertEqual [[1, 'initialized', {}]], g:message_list

Execute(Results that are not dictionaries should be handled correctly):
  call ale#lsp#HandleInitResponse(b:conn, {
  \ 'jsonrpc': '2.0',
  \ 'id': 1,
  \ 'result': v:null,
  \})
  AssertEqual [], g:message_list