How to use handleWarning method in Jest

Best JavaScript code snippet using jest

WatchmanWatcher.js

Source: WatchmanWatcher.js Github

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...149 if (handleError(self, error)) {150 /​/​ The Watchman watcher is unusable on this system, we cannot continue151 return;152 }153 handleWarning(resp);154 self.capabilities = resp.capabilities;155 if (self.capabilities.relative_root) {156 self.client.command(['watch-project', getWatchRoot()], onWatchProject);157 } else {158 self.client.command(['watch', getWatchRoot()], onWatch);159 }160 }161 function onWatchProject(error, resp) {162 if (handleError(self, error)) {163 return;164 }165 handleWarning(resp);166 self.watchProjectInfo = {167 relativePath: resp.relative_path ? resp.relative_path : '',168 root: resp.watch169 };170 self.client.command(['clock', getWatchRoot()], onClock);171 }172 function onWatch(error, resp) {173 if (handleError(self, error)) {174 return;175 }176 handleWarning(resp);177 self.client.command(['clock', getWatchRoot()], onClock);178 }179 function onClock(error, resp) {180 if (handleError(self, error)) {181 return;182 }183 handleWarning(resp);184 const options = {185 fields: ['name', 'exists', 'new'],186 since: resp.clock187 }; /​/​ If the server has the wildmatch capability available it supports188 /​/​ the recursive **/​*.foo style match and we can offload our globs189 /​/​ to the watchman server. This saves both on data size to be190 /​/​ communicated back to us and compute for evaluating the globs191 /​/​ in our node process.192 if (self.capabilities.wildmatch) {193 if (self.globs.length === 0) {194 if (!self.dot) {195 /​/​ Make sure we honor the dot option if even we're not using globs.196 options.expression = [197 'match',198 '**',199 'wholename',200 {201 includedotfiles: false202 }203 ];204 }205 } else {206 options.expression = ['anyof'];207 for (const i in self.globs) {208 options.expression.push([209 'match',210 self.globs[i],211 'wholename',212 {213 includedotfiles: self.dot214 }215 ]);216 }217 }218 }219 if (self.capabilities.relative_root) {220 options.relative_root = self.watchProjectInfo.relativePath;221 }222 self.client.command(223 ['subscribe', getWatchRoot(), SUB_NAME, options],224 onSubscribe225 );226 }227 function onSubscribe(error, resp) {228 if (handleError(self, error)) {229 return;230 }231 handleWarning(resp);232 self.emit('ready');233 }234 self.client.capabilityCheck(235 {236 optional: ['wildmatch', 'relative_root']237 },238 onCapability239 );240};241/​**242 * Handles a change event coming from the subscription.243 *244 * @param {Object} resp245 * @private246 */​247WatchmanWatcher.prototype.handleChangeEvent = function (resp) {248 _assert().default.equal(249 resp.subscription,250 SUB_NAME,251 'Invalid subscription event.'252 );253 if (resp.is_fresh_instance) {254 this.emit('fresh_instance');255 }256 if (resp.is_fresh_instance) {257 this.emit('fresh_instance');258 }259 if (Array.isArray(resp.files)) {260 resp.files.forEach(this.handleFileChange, this);261 }262};263/​**264 * Handles a single change event record.265 *266 * @param {Object} changeDescriptor267 * @private268 */​269WatchmanWatcher.prototype.handleFileChange = function (changeDescriptor) {270 const self = this;271 let absPath;272 let relativePath;273 if (this.capabilities.relative_root) {274 relativePath = changeDescriptor.name;275 absPath = _path().default.join(276 this.watchProjectInfo.root,277 this.watchProjectInfo.relativePath,278 relativePath279 );280 } else {281 absPath = _path().default.join(this.root, changeDescriptor.name);282 relativePath = changeDescriptor.name;283 }284 if (285 !(self.capabilities.wildmatch && !this.hasIgnore) &&286 !_common().default.isFileIncluded(287 this.globs,288 this.dot,289 this.doIgnore,290 relativePath291 )292 ) {293 return;294 }295 if (!changeDescriptor.exists) {296 self.emitEvent(DELETE_EVENT, relativePath, self.root);297 } else {298 fs().lstat(absPath, (error, stat) => {299 /​/​ Files can be deleted between the event and the lstat call300 /​/​ the most reliable thing to do here is to ignore the event.301 if (error && error.code === 'ENOENT') {302 return;303 }304 if (handleError(self, error)) {305 return;306 }307 const eventType = changeDescriptor.new ? ADD_EVENT : CHANGE_EVENT; /​/​ Change event on dirs are mostly useless.308 if (!(eventType === CHANGE_EVENT && stat.isDirectory())) {309 self.emitEvent(eventType, relativePath, self.root, stat);310 }311 });312 }313};314/​**315 * Dispatches the event.316 *317 * @param {string} eventType318 * @param {string} filepath319 * @param {string} root320 * @param {fs.Stat} stat321 * @private322 */​323WatchmanWatcher.prototype.emitEvent = function (324 eventType,325 filepath,326 root,327 stat328) {329 this.emit(eventType, filepath, root, stat);330 this.emit(ALL_EVENT, eventType, filepath, root, stat);331};332/​**333 * Closes the watcher.334 *335 * @param {function} callback336 * @private337 */​338WatchmanWatcher.prototype.close = function (callback) {339 this.client.removeAllListeners();340 this.client.end();341 callback && callback(null, true);342};343/​**344 * Handles an error and returns true if exists.345 *346 * @param {WatchmanWatcher} self347 * @param {Error} error348 * @private349 */​350function handleError(self, error) {351 if (error != null) {352 self.emit('error', error);353 return true;354 } else {355 return false;356 }357}358/​**359 * Handles a warning in the watchman resp object.360 *361 * @param {object} resp362 * @private363 */​364function handleWarning(resp) {365 if ('warning' in resp) {366 if (_recrawlWarningDedupe().default.isRecrawlWarningDupe(resp.warning)) {367 return true;368 }369 console.warn(resp.warning);370 return true;371 } else {372 return false;373 }...

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Game.jsx

Source: Game.jsx Github

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...34 <Info>35 <PlayerCounter36 onAdd={() => handleAddPlayer()}37 onRemove={() => handleRemovePlayer()}38 onBlur={() => handleWarning()}39 playerCount={players.length}40 /​>41 <Warning message={warning} /​>42 <Players43 players={players}44 onClick={handleDeal}45 onBlur={handleWarning}46 /​>47 </​Info>48 <Info>49 <GameButtons50 handleShuffle={handleShuffle}51 onBlur={handleWarning}52 handleReset={handleReset}53 shuffle={"Shuffle"}54 reset={"Reset"}55 /​>56 <Deck deck={deck} player={"deck"} /​>57 </​Info>58 </​StyledGame>59 );60 /​**61 * Adds a card of each suit and value to the deck62 * @returns {[]} an array of card objects63 */​64 function initDeck() {65 const deck = [];66 suits.forEach((s) => {67 values.forEach((v) => {68 let id = `${v} of ${s.suitName}`;69 deck.push({ s, v, id });70 });71 });72 return deck;73 }74 /​**75 * Sends last card from game deck to chosen player's deck76 * @param {int} i Player to deal to77 * @returns {void}78 */​79 function handleDeal(i) {80 if (handleWarning(deck.length === 0, "No cards left in deck!")) {81 return;82 } else {83 let tempDeck = deck.slice();84 let card = tempDeck.pop();85 setDeck(tempDeck);86 let playersTemp = players.slice();87 playersTemp[i].push(card);88 setPlayers(playersTemp);89 return;90 }91 }92 /​**93 * Adds new player to players94 * @returns {void}95 */​96 function handleAddPlayer() {97 let playersTemp = players.slice();98 playersTemp.push([]);99 setPlayers(playersTemp);100 return;101 }102 /​**103 * Removes last player added from the game.104 * Instead displays a warning if a card has been dealt.105 * @returns {void}106 */​107 function handleRemovePlayer() {108 if (109 handleWarning(110 deck.length < 52,111 "Cannot remove player while game in session!"112 )113 ) {114 return;115 } else {116 let playersTemp = players.slice(0, players.length - 1);117 setPlayers(playersTemp);118 return;119 }120 }121 /​**122 * Checks if warning should be updated and changes it accordingly.123 * @param test operation that should be true to display warning124 * @param {string} message125 * @returns {boolean}126 */​127 function handleWarning(test, message) {128 if (test) {129 setWarning(message);130 return true;131 } else {132 setWarning("");133 return false;134 }135 }136 /​**137 * Randomly swaps each card in the playable deck with another138 * @returns {void}139 */​140 function handleShuffle() {141 if (142 handleWarning(deck.length !== 52, "Can only shuffle when deck is full!")143 ) {144 return;145 } else {146 let tempDeck = deck.slice();147 let i = 0;148 tempDeck.map(() => {149 let randomIndex = Math.floor(Math.random() * deck.length);150 let cardStore = tempDeck[i];151 tempDeck[i] = tempDeck[randomIndex];152 tempDeck[randomIndex] = cardStore;153 ++i;154 return "done";155 });156 setDeck(tempDeck);...

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Index.js

Source: Index.js Github

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...28 isValid = false;29 }30 return isValid;31 }32 function handleWarning(target, status) {33 let field = document.getElementById(target);34 if(status === true) {35 field.classList.add('validation-fail');36 } else {37 field.classList.remove('validation-fail');38 }39 }40 function handleNameInput(event) {41 if(event.target.value.length > 0) {42 handleWarning('name', false)43 } else {44 handleWarning('name', true)45 }46 setName(event.target.value)47 }48 function handleYearInput(event) {49 if(event.target.value.length > 0) {50 handleWarning('year', false)51 } else {52 handleWarning('year', true)53 }54 setYear(event.target.value)55 }56 function handlePlateInput(event) {57 if(event.target.value.length > 0) {58 handleWarning('plate', false)59 } else {60 handleWarning('plate', true)61 }62 setPlate(event.target.value)63 }64 async function saveVehicle(event) {65 event.preventDefault();66 if(!validate()) {67 return68 }69 setSaving(true)70 try {71 let { data } = await http.put(`vehicles/​${vehicle?.id}`, { name, year, plate })72 handleUpdatedVehicle(data);73 fn.handleShow(false);74 toast.success('Veículo salvo')...

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list.js

Source: list.js Github

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...8export const FETCH_NEGATIVE_LIST_DATA ='FETCH_NEGATIVE_LIST_DATA';9export const FETCH_NEGATIVE_LIST_HANDLEWARNING = 'FETCH_NEGATIVE_LIST_HANDLEWARNING';10export const FETCH_NEGATIVE_LIST_PRE_HANDLEWARNING ='FETCH_NEGATIVE_LIST_PRE_HANDLEWARNING';11export const NEGATIVE_LIST_PRESET_PARAM = 'NEGATIVE_LIST_PRESET_PARAM';12export function list_pre_handleWarning(objectIds){13 return {14 type: FETCH_NEGATIVE_LIST_PRE_HANDLEWARNING,15 objectIds: objectIds16 };17};18export function list_handleWarning(objectIds,refresh) {19 return function (dispatch) {20 $.ajax({21 "url":ApiDomain+"/​opinion/​rest/​negative/​handleWarning?objectIds="+objectIds,22 "type": "get",23 dataType:"text"24 })25 .done(function(re) {26 dispatch({27 type: FETCH_NEGATIVE_LIST_HANDLEWARNING,28 status: 200,29 remsg:re30 });31 })32 .fail(function(re) {...

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configure.js

Source: configure.js Github

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...35 } catch (e) {36 payload = null;37 }38 if (payload === null || payload.command === undefined) {39 ws.send(handleWarning(logger, ws, 'Command is not provided.'));40 return;41 }42 const commandLogger = logger.child({ payload });43 switch (payload.command) {44 case 'latest':45 await handleLatest(commandLogger, ws, payload);46 break;47 case 'setting-update':48 await handleSettingUpdate(commandLogger, ws, payload);49 break;50 case 'symbol-update-last-buy-price':51 await handleSymbolUpdateLastBuyPrice(commandLogger, ws, payload);52 break;53 case 'symbol-delete':54 await handleSymbolDelete(commandLogger, ws, payload);55 break;56 case 'symbol-setting-update':57 await handleSymbolSettingUpdate(commandLogger, ws, payload);58 break;59 case 'symbol-setting-delete':60 await handleSymbolSettingDelete(commandLogger, ws, payload);61 break;62 case 'symbol-enable-action':63 await handleSymbolEnableAction(commandLogger, ws, payload);64 break;65 case 'manual-trade':66 await handleManualTrade(commandLogger, ws, payload);67 break;68 case 'cancel-order':69 await handleCancelOrder(commandLogger, ws, payload);70 break;71 default:72 handleWarning(logger, ws, 'Command is not recognised.');73 }74 });75 ws.send(76 JSON.stringify({77 result: true,78 type: 'connection_success',79 message: 'You are successfully connected to WebSocket.'80 })81 );82 PubSub.subscribe('frontend-notification', async (message, data) => {83 logger.info(84 { tag: 'frontend-notification' },85 `Message: ${message}, Data: ${data}`86 );...

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App.js

Source: App.js Github

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...61 this.handleWarning = this.handleWarning.bind(this);62 this.handleLoginClick = this.handleLoginClick.bind(this);63 this.handleLogoutClick = this.handleLogoutClick.bind(this);64 }65 handleWarning(){66 this.setState({showWarning:!this.state.showWarning})67 }68 handleLoginClick(){69 this.setState({isLoggedIn: true})70 }71 handleLogoutClick(){72 this.setState({isLoggedIn: false})73 }74 render(){75 const isLoggedIn = this.state.isLoggedIn;76 let button = isLoggedIn?77 <LogoutButton onClick={this.handleLogoutClick} /​>78 :79 <LoginButton onClick={this.handleLoginClick}/​>...

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decode.js

Source: decode.js Github

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...30 }31 /​* Handle a warning.32 * See https:/​/​github.com/​wooorm/​parse-entities33 * for the warnings. */​34 function handleWarning(reason, position, code) {35 if (code === 3) {36 return;37 }38 ctx.file.message(reason, position);39 }40 /​* Decode `value` (at `position`) into text-nodes. */​41 function decoder(value, position, handler) {42 entities(value, {43 position: normalize(position),44 warning: handleWarning,45 text: handler,46 reference: handler,47 textContext: ctx,48 referenceContext: ctx...

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Warning.js

Source: Warning.js Github

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...16 showWarning: true17 };18 this.handleWarning = this.handleWarning.bind(this);19 }20 handleWarning() {21 this.setState(state => ({22 showWarning: !state.showWarning23 }));24 }25 render() {26 return (27 <div>28 <Warning warn={this.state.showWarning} /​>29 <button onClick={this.handleWarning}>30 {this.state.showWarning === true ? "Hide" : "Show"}31 </​button>32 </​div>33 );34 }...

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Since Jest tests are runtime tests, they only have access to runtime information. You're trying to use a type, which is compile-time information. TypeScript should already be doing the type aspect of this for you. (More on that in a moment.)

The fact the tests only have access to runtime information has a couple of ramifications:

  • If it's valid for getAll to return an empty array (because there aren't any entities to get), the test cannot tell you whether the array would have had Entity elements in it if it hadn't been empty. All it can tell you is it got an array.

  • In the non-empty case, you have to check every element of the array to see if it's an Entity. You've said Entity is a class, not just a type, so that's possible. I'm not a user of Jest (I should be), but it doesn't seem to have a test specifically for this; it does have toBeTruthy, though, and we can use every to tell us if every element is an Entity:

    it('should return an array of Entity class', async () => {
         const all = await service.getAll()
         expect(all.every(e => e instanceof Entity)).toBeTruthy();
    });
    

    Beware, though, that all calls to every on an empty array return true, so again, that empty array issue raises its head.

If your Jest tests are written in TypeScript, you can improve on that by ensuring TypeScript tests the compile-time type of getAll's return value:

it('should return an array of Entity class', async () => {
    const all: Entity[] = await service.getAll()
    //       ^^^^^^^^^^
    expect(all.every(e => e instanceof Entity)).toBeTruthy();
});

TypeScript will complain about that assignment at compile time if it's not valid, and Jest will complain at runtime if it sees an array containing a non-Entity object.


But jonrsharpe has a good point: This test may not be useful vs. testing for specific values that should be there.

https://stackoverflow.com/questions/71717652/how-to-test-if-a-method-returns-an-array-of-a-class-in-jest

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