How to use SimpleComponent method in ng-mocks

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ReactShallowRendererMemo-test.js

Source:ReactShallowRendererMemo-test.js Github

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1/**2 * Copyright (c) Facebook, Inc. and its affiliates.3 *4 * This source code is licensed under the MIT license found in the5 * LICENSE file in the root directory of this source tree.6 *7 * @emails react-core8 * @jest-environment node9 */10'use strict';11import * as PropTypes from 'prop-types';12import * as React from 'react';13import ReactShallowRenderer from 'react-test-renderer/shallow';14const createRenderer = ReactShallowRenderer.createRenderer;15describe('ReactShallowRendererMemo', () => {16 it('should call all of the legacy lifecycle hooks', () => {17 const logs = [];18 const logger = message => () => logs.push(message) || true;19 const SomeComponent = React.memo(20 class SomeComponent extends React.Component {21 UNSAFE_componentWillMount = logger('componentWillMount');22 componentDidMount = logger('componentDidMount');23 UNSAFE_componentWillReceiveProps = logger('componentWillReceiveProps');24 shouldComponentUpdate = logger('shouldComponentUpdate');25 UNSAFE_componentWillUpdate = logger('componentWillUpdate');26 componentDidUpdate = logger('componentDidUpdate');27 componentWillUnmount = logger('componentWillUnmount');28 render() {29 return <div />;30 }31 },32 );33 const shallowRenderer = createRenderer();34 shallowRenderer.render(<SomeComponent foo={1} />);35 // Calling cDU might lead to problems with host component references.36 // Since our components aren't really mounted, refs won't be available.37 expect(logs).toEqual(['componentWillMount']);38 logs.splice(0);39 const instance = shallowRenderer.getMountedInstance();40 instance.setState({});41 expect(logs).toEqual(['shouldComponentUpdate', 'componentWillUpdate']);42 logs.splice(0);43 shallowRenderer.render(<SomeComponent foo={2} />);44 // The previous shallow renderer did not trigger cDU for props changes.45 expect(logs).toEqual([46 'componentWillReceiveProps',47 'shouldComponentUpdate',48 'componentWillUpdate',49 ]);50 });51 it('should call all of the new lifecycle hooks', () => {52 const logs = [];53 const logger = message => () => logs.push(message) || true;54 const SomeComponent = React.memo(55 class SomeComponent extends React.Component {56 state = {};57 static getDerivedStateFromProps = logger('getDerivedStateFromProps');58 componentDidMount = logger('componentDidMount');59 shouldComponentUpdate = logger('shouldComponentUpdate');60 componentDidUpdate = logger('componentDidUpdate');61 componentWillUnmount = logger('componentWillUnmount');62 render() {63 return <div />;64 }65 },66 );67 const shallowRenderer = createRenderer();68 shallowRenderer.render(<SomeComponent foo={1} />);69 // Calling cDU might lead to problems with host component references.70 // Since our components aren't really mounted, refs won't be available.71 expect(logs).toEqual(['getDerivedStateFromProps']);72 logs.splice(0);73 const instance = shallowRenderer.getMountedInstance();74 instance.setState({});75 expect(logs).toEqual(['getDerivedStateFromProps', 'shouldComponentUpdate']);76 logs.splice(0);77 shallowRenderer.render(<SomeComponent foo={2} />);78 // The previous shallow renderer did not trigger cDU for props changes.79 expect(logs).toEqual(['getDerivedStateFromProps', 'shouldComponentUpdate']);80 });81 it('should not invoke deprecated lifecycles (cWM/cWRP/cWU) if new static gDSFP is present', () => {82 const Component = React.memo(83 class Component extends React.Component {84 state = {};85 static getDerivedStateFromProps() {86 return null;87 }88 componentWillMount() {89 throw Error('unexpected');90 }91 componentWillReceiveProps() {92 throw Error('unexpected');93 }94 componentWillUpdate() {95 throw Error('unexpected');96 }97 render() {98 return null;99 }100 },101 );102 const shallowRenderer = createRenderer();103 shallowRenderer.render(<Component />);104 });105 it('should not invoke deprecated lifecycles (cWM/cWRP/cWU) if new getSnapshotBeforeUpdate is present', () => {106 const Component = React.memo(107 class Component extends React.Component {108 getSnapshotBeforeUpdate() {109 return null;110 }111 componentWillMount() {112 throw Error('unexpected');113 }114 componentWillReceiveProps() {115 throw Error('unexpected');116 }117 componentWillUpdate() {118 throw Error('unexpected');119 }120 render() {121 return null;122 }123 },124 );125 const shallowRenderer = createRenderer();126 shallowRenderer.render(<Component value={1} />);127 shallowRenderer.render(<Component value={2} />);128 });129 it('should not call getSnapshotBeforeUpdate or componentDidUpdate when updating since refs wont exist', () => {130 const Component = React.memo(131 class Component extends React.Component {132 getSnapshotBeforeUpdate() {133 throw Error('unexpected');134 }135 componentDidUpdate() {136 throw Error('unexpected');137 }138 render() {139 return null;140 }141 },142 );143 const shallowRenderer = createRenderer();144 shallowRenderer.render(<Component value={1} />);145 shallowRenderer.render(<Component value={2} />);146 });147 it('should only render 1 level deep', () => {148 const Parent = React.memo(function Parent() {149 return (150 <div>151 <Child />152 </div>153 );154 });155 function Child() {156 throw Error('This component should not render');157 }158 const shallowRenderer = createRenderer();159 shallowRenderer.render(React.createElement(Parent));160 });161 it('should have shallow rendering', () => {162 const SomeComponent = React.memo(163 class SomeComponent extends React.Component {164 render() {165 return (166 <div>167 <span className="child1" />168 <span className="child2" />169 </div>170 );171 }172 },173 );174 const shallowRenderer = createRenderer();175 const result = shallowRenderer.render(<SomeComponent />);176 expect(result.type).toBe('div');177 expect(result.props.children).toEqual([178 <span className="child1" />,179 <span className="child2" />,180 ]);181 });182 it('should handle Profiler', () => {183 const SomeComponent = React.memo(184 class SomeComponent extends React.Component {185 render() {186 return (187 <React.Profiler id="test" onRender={jest.fn()}>188 <div>189 <span className="child1" />190 <span className="child2" />191 </div>192 </React.Profiler>193 );194 }195 },196 );197 const shallowRenderer = createRenderer();198 const result = shallowRenderer.render(<SomeComponent />);199 expect(result.type).toBe(React.Profiler);200 expect(result.props.children).toEqual(201 <div>202 <span className="child1" />203 <span className="child2" />204 </div>,205 );206 });207 it('should enable shouldComponentUpdate to prevent a re-render', () => {208 let renderCounter = 0;209 const SimpleComponent = React.memo(210 class SimpleComponent extends React.Component {211 state = {update: false};212 shouldComponentUpdate(nextProps, nextState) {213 return this.state.update !== nextState.update;214 }215 render() {216 renderCounter++;217 return <div>{`${renderCounter}`}</div>;218 }219 },220 );221 const shallowRenderer = createRenderer();222 shallowRenderer.render(<SimpleComponent />);223 expect(shallowRenderer.getRenderOutput()).toEqual(<div>1</div>);224 const instance = shallowRenderer.getMountedInstance();225 instance.setState({update: false});226 expect(shallowRenderer.getRenderOutput()).toEqual(<div>1</div>);227 instance.setState({update: true});228 expect(shallowRenderer.getRenderOutput()).toEqual(<div>2</div>);229 });230 it('should enable PureComponent to prevent a re-render', () => {231 let renderCounter = 0;232 const SimpleComponent = React.memo(233 class SimpleComponent extends React.PureComponent {234 state = {update: false};235 render() {236 renderCounter++;237 return <div>{`${renderCounter}`}</div>;238 }239 },240 );241 const shallowRenderer = createRenderer();242 shallowRenderer.render(<SimpleComponent />);243 expect(shallowRenderer.getRenderOutput()).toEqual(<div>1</div>);244 const instance = shallowRenderer.getMountedInstance();245 instance.setState({update: false});246 expect(shallowRenderer.getRenderOutput()).toEqual(<div>1</div>);247 instance.setState({update: true});248 expect(shallowRenderer.getRenderOutput()).toEqual(<div>2</div>);249 });250 it('should not run shouldComponentUpdate during forced update', () => {251 let scuCounter = 0;252 const SimpleComponent = React.memo(253 class SimpleComponent extends React.Component {254 state = {count: 1};255 shouldComponentUpdate() {256 scuCounter++;257 return false;258 }259 render() {260 return <div>{`${this.state.count}`}</div>;261 }262 },263 );264 const shallowRenderer = createRenderer();265 shallowRenderer.render(<SimpleComponent />);266 expect(scuCounter).toEqual(0);267 expect(shallowRenderer.getRenderOutput()).toEqual(<div>1</div>);268 // Force update the initial state. sCU should not fire.269 const instance = shallowRenderer.getMountedInstance();270 instance.forceUpdate();271 expect(scuCounter).toEqual(0);272 expect(shallowRenderer.getRenderOutput()).toEqual(<div>1</div>);273 // Setting state updates the instance, but doesn't re-render274 // because sCU returned false.275 instance.setState(state => ({count: state.count + 1}));276 expect(scuCounter).toEqual(1);277 expect(instance.state.count).toEqual(2);278 expect(shallowRenderer.getRenderOutput()).toEqual(<div>1</div>);279 // A force update updates the render output, but doesn't call sCU.280 instance.forceUpdate();281 expect(scuCounter).toEqual(1);282 expect(instance.state.count).toEqual(2);283 expect(shallowRenderer.getRenderOutput()).toEqual(<div>2</div>);284 });285 it('should rerender when calling forceUpdate', () => {286 let renderCounter = 0;287 const SimpleComponent = React.memo(288 class SimpleComponent extends React.Component {289 render() {290 renderCounter += 1;291 return <div />;292 }293 },294 );295 const shallowRenderer = createRenderer();296 shallowRenderer.render(<SimpleComponent />);297 expect(renderCounter).toEqual(1);298 const instance = shallowRenderer.getMountedInstance();299 instance.forceUpdate();300 expect(renderCounter).toEqual(2);301 });302 it('should shallow render a function component', () => {303 function SomeComponent(props, context) {304 return (305 <div>306 <div>{props.foo}</div>307 <div>{context.bar}</div>308 <span className="child1" />309 <span className="child2" />310 </div>311 );312 }313 const SomeMemoComponent = React.memo(SomeComponent);314 SomeComponent.contextTypes = {315 bar: PropTypes.string,316 };317 const shallowRenderer = createRenderer();318 const result = shallowRenderer.render(<SomeMemoComponent foo={'FOO'} />, {319 bar: 'BAR',320 });321 expect(result.type).toBe('div');322 expect(result.props.children).toEqual([323 <div>FOO</div>,324 <div>BAR</div>,325 <span className="child1" />,326 <span className="child2" />,327 ]);328 });329 it('should shallow render a component returning strings directly from render', () => {330 const Text = React.memo(({value}) => value);331 const shallowRenderer = createRenderer();332 const result = shallowRenderer.render(<Text value="foo" />);333 expect(result).toEqual('foo');334 });335 it('should shallow render a component returning numbers directly from render', () => {336 const Text = React.memo(({value}) => value);337 const shallowRenderer = createRenderer();338 const result = shallowRenderer.render(<Text value={10} />);339 expect(result).toEqual(10);340 });341 it('should shallow render a fragment', () => {342 class SomeComponent extends React.Component {343 render() {344 return <div />;345 }346 }347 class Fragment extends React.Component {348 render() {349 return [<div key="a" />, <span key="b" />, <SomeComponent />];350 }351 }352 const shallowRenderer = createRenderer();353 const result = shallowRenderer.render(<Fragment />);354 expect(result).toEqual([355 <div key="a" />,356 <span key="b" />,357 <SomeComponent />,358 ]);359 });360 it('should shallow render a React.fragment', () => {361 class SomeComponent extends React.Component {362 render() {363 return <div />;364 }365 }366 class Fragment extends React.Component {367 render() {368 return (369 <>370 <div />371 <span />372 <SomeComponent />373 </>374 );375 }376 }377 const shallowRenderer = createRenderer();378 const result = shallowRenderer.render(<Fragment />);379 expect(result).toEqual(380 <>381 <div />382 <span />383 <SomeComponent />384 </>,385 );386 });387 it('should throw for invalid elements', () => {388 class SomeComponent extends React.Component {389 render() {390 return <div />;391 }392 }393 const shallowRenderer = createRenderer();394 expect(() => shallowRenderer.render(SomeComponent)).toThrowError(395 'ReactShallowRenderer render(): Invalid component element. Instead of ' +396 'passing a component class, make sure to instantiate it by passing it ' +397 'to React.createElement.',398 );399 expect(() => shallowRenderer.render(<div />)).toThrowError(400 'ReactShallowRenderer render(): Shallow rendering works only with ' +401 'custom components, not primitives (div). Instead of calling ' +402 '`.render(el)` and inspecting the rendered output, look at `el.props` ' +403 'directly instead.',404 );405 });406 it('should have shallow unmounting', () => {407 const componentWillUnmount = jest.fn();408 class SomeComponent extends React.Component {409 componentWillUnmount = componentWillUnmount;410 render() {411 return <div />;412 }413 }414 const shallowRenderer = createRenderer();415 shallowRenderer.render(<SomeComponent />);416 shallowRenderer.unmount();417 expect(componentWillUnmount).toBeCalled();418 });419 it('can shallow render to null', () => {420 class SomeComponent extends React.Component {421 render() {422 return null;423 }424 }425 const shallowRenderer = createRenderer();426 const result = shallowRenderer.render(<SomeComponent />);427 expect(result).toBe(null);428 });429 it('can shallow render with a ref', () => {430 class SomeComponent extends React.Component {431 render() {432 return <div ref="hello" />;433 }434 }435 const shallowRenderer = createRenderer();436 // Shouldn't crash.437 shallowRenderer.render(<SomeComponent />);438 });439 it('lets you update shallowly rendered components', () => {440 class SomeComponent extends React.Component {441 state = {clicked: false};442 onClick = () => {443 this.setState({clicked: true});444 };445 render() {446 const className = this.state.clicked ? 'was-clicked' : '';447 if (this.props.aNew === 'prop') {448 return (449 <a href="#" onClick={this.onClick} className={className}>450 Test link451 </a>452 );453 } else {454 return (455 <div>456 <span className="child1" />457 <span className="child2" />458 </div>459 );460 }461 }462 }463 const shallowRenderer = createRenderer();464 const result = shallowRenderer.render(<SomeComponent />);465 expect(result.type).toBe('div');466 expect(result.props.children).toEqual([467 <span className="child1" />,468 <span className="child2" />,469 ]);470 const updatedResult = shallowRenderer.render(<SomeComponent aNew="prop" />);471 expect(updatedResult.type).toBe('a');472 const mockEvent = {};473 updatedResult.props.onClick(mockEvent);474 const updatedResultCausedByClick = shallowRenderer.getRenderOutput();475 expect(updatedResultCausedByClick.type).toBe('a');476 expect(updatedResultCausedByClick.props.className).toBe('was-clicked');477 });478 it('can access the mounted component instance', () => {479 const SimpleComponent = React.memo(480 class SimpleComponent extends React.Component {481 someMethod = () => {482 return this.props.n;483 };484 render() {485 return <div>{this.props.n}</div>;486 }487 },488 );489 const shallowRenderer = createRenderer();490 shallowRenderer.render(<SimpleComponent n={5} />);491 expect(shallowRenderer.getMountedInstance().someMethod()).toEqual(5);492 });493 it('can shallowly render components with contextTypes', () => {494 const SimpleComponent = React.memo(495 class SimpleComponent extends React.Component {496 static contextTypes = {497 name: PropTypes.string,498 };499 render() {500 return <div />;501 }502 },503 );504 const shallowRenderer = createRenderer();505 const result = shallowRenderer.render(<SimpleComponent />);506 expect(result).toEqual(<div />);507 });508 it('passes expected params to legacy component lifecycle methods', () => {509 const componentDidUpdateParams = [];510 const componentWillReceivePropsParams = [];511 const componentWillUpdateParams = [];512 const setStateParams = [];513 const shouldComponentUpdateParams = [];514 const initialProp = {prop: 'init prop'};515 const initialState = {state: 'init state'};516 const initialContext = {context: 'init context'};517 const updatedState = {state: 'updated state'};518 const updatedProp = {prop: 'updated prop'};519 const updatedContext = {context: 'updated context'};520 const SimpleComponent = React.memo(521 class SimpleComponent extends React.Component {522 constructor(props, context) {523 super(props, context);524 this.state = initialState;525 }526 static contextTypes = {527 context: PropTypes.string,528 };529 componentDidUpdate(...args) {530 componentDidUpdateParams.push(...args);531 }532 UNSAFE_componentWillReceiveProps(...args) {533 componentWillReceivePropsParams.push(...args);534 this.setState((...innerArgs) => {535 setStateParams.push(...innerArgs);536 return updatedState;537 });538 }539 UNSAFE_componentWillUpdate(...args) {540 componentWillUpdateParams.push(...args);541 }542 shouldComponentUpdate(...args) {543 shouldComponentUpdateParams.push(...args);544 return true;545 }546 render() {547 return null;548 }549 },550 );551 const shallowRenderer = createRenderer();552 shallowRenderer.render(553 React.createElement(SimpleComponent, initialProp),554 initialContext,555 );556 expect(componentDidUpdateParams).toEqual([]);557 expect(componentWillReceivePropsParams).toEqual([]);558 expect(componentWillUpdateParams).toEqual([]);559 expect(setStateParams).toEqual([]);560 expect(shouldComponentUpdateParams).toEqual([]);561 // Lifecycle hooks should be invoked with the correct prev/next params on update.562 shallowRenderer.render(563 React.createElement(SimpleComponent, updatedProp),564 updatedContext,565 );566 expect(componentWillReceivePropsParams).toEqual([567 updatedProp,568 updatedContext,569 ]);570 expect(setStateParams).toEqual([initialState, initialProp]);571 expect(shouldComponentUpdateParams).toEqual([572 updatedProp,573 updatedState,574 updatedContext,575 ]);576 expect(componentWillUpdateParams).toEqual([577 updatedProp,578 updatedState,579 updatedContext,580 ]);581 expect(componentDidUpdateParams).toEqual([]);582 });583 it('passes expected params to new component lifecycle methods', () => {584 const componentDidUpdateParams = [];585 const getDerivedStateFromPropsParams = [];586 const shouldComponentUpdateParams = [];587 const initialProp = {prop: 'init prop'};588 const initialState = {state: 'init state'};589 const initialContext = {context: 'init context'};590 const updatedProp = {prop: 'updated prop'};591 const updatedContext = {context: 'updated context'};592 const SimpleComponent = React.memo(593 class SimpleComponent extends React.Component {594 constructor(props, context) {595 super(props, context);596 this.state = initialState;597 }598 static contextTypes = {599 context: PropTypes.string,600 };601 componentDidUpdate(...args) {602 componentDidUpdateParams.push(...args);603 }604 static getDerivedStateFromProps(...args) {605 getDerivedStateFromPropsParams.push(args);606 return null;607 }608 shouldComponentUpdate(...args) {609 shouldComponentUpdateParams.push(...args);610 return true;611 }612 render() {613 return null;614 }615 },616 );617 const shallowRenderer = createRenderer();618 // The only lifecycle hook that should be invoked on initial render619 // Is the static getDerivedStateFromProps() methods620 shallowRenderer.render(621 React.createElement(SimpleComponent, initialProp),622 initialContext,623 );624 expect(getDerivedStateFromPropsParams).toEqual([625 [initialProp, initialState],626 ]);627 expect(componentDidUpdateParams).toEqual([]);628 expect(shouldComponentUpdateParams).toEqual([]);629 // Lifecycle hooks should be invoked with the correct prev/next params on update.630 shallowRenderer.render(631 React.createElement(SimpleComponent, updatedProp),632 updatedContext,633 );634 expect(getDerivedStateFromPropsParams).toEqual([635 [initialProp, initialState],636 [updatedProp, initialState],637 ]);638 expect(shouldComponentUpdateParams).toEqual([639 updatedProp,640 initialState,641 updatedContext,642 ]);643 expect(componentDidUpdateParams).toEqual([]);644 });645 it('can shallowly render components with ref as function', () => {646 const SimpleComponent = React.memo(647 class SimpleComponent extends React.Component {648 state = {clicked: false};649 handleUserClick = () => {650 this.setState({clicked: true});651 };652 render() {653 return (654 <div655 ref={() => {}}656 onClick={this.handleUserClick}657 className={this.state.clicked ? 'clicked' : ''}658 />659 );660 }661 },662 );663 const shallowRenderer = createRenderer();664 shallowRenderer.render(<SimpleComponent />);665 let result = shallowRenderer.getRenderOutput();666 expect(result.type).toEqual('div');667 expect(result.props.className).toEqual('');668 result.props.onClick();669 result = shallowRenderer.getRenderOutput();670 expect(result.type).toEqual('div');671 expect(result.props.className).toEqual('clicked');672 });673 it('can initialize state via static getDerivedStateFromProps', () => {674 const SimpleComponent = React.memo(675 class SimpleComponent extends React.Component {676 state = {677 count: 1,678 };679 static getDerivedStateFromProps(props, prevState) {680 return {681 count: prevState.count + props.incrementBy,682 other: 'foobar',683 };684 }685 render() {686 return (687 <div>{`count:${this.state.count}, other:${this.state.other}`}</div>688 );689 }690 },691 );692 const shallowRenderer = createRenderer();693 const result = shallowRenderer.render(<SimpleComponent incrementBy={2} />);694 expect(result).toEqual(<div>count:3, other:foobar</div>);695 });696 it('can setState in componentWillMount when shallow rendering', () => {697 const SimpleComponent = React.memo(698 class SimpleComponent extends React.Component {699 UNSAFE_componentWillMount() {700 this.setState({groovy: 'doovy'});701 }702 render() {703 return <div>{this.state.groovy}</div>;704 }705 },706 );707 const shallowRenderer = createRenderer();708 const result = shallowRenderer.render(<SimpleComponent />);709 expect(result).toEqual(<div>doovy</div>);710 });711 it('can setState in componentWillMount repeatedly when shallow rendering', () => {712 const SimpleComponent = React.memo(713 class SimpleComponent extends React.Component {714 state = {715 separator: '-',716 };717 UNSAFE_componentWillMount() {718 this.setState({groovy: 'doovy'});719 this.setState({doovy: 'groovy'});720 }721 render() {722 const {groovy, doovy, separator} = this.state;723 return <div>{`${groovy}${separator}${doovy}`}</div>;724 }725 },726 );727 const shallowRenderer = createRenderer();728 const result = shallowRenderer.render(<SimpleComponent />);729 expect(result).toEqual(<div>doovy-groovy</div>);730 });731 it('can setState in componentWillMount with an updater function repeatedly when shallow rendering', () => {732 const SimpleComponent = React.memo(733 class SimpleComponent extends React.Component {734 state = {735 separator: '-',736 };737 UNSAFE_componentWillMount() {738 this.setState(state => ({groovy: 'doovy'}));739 this.setState(state => ({doovy: state.groovy}));740 }741 render() {742 const {groovy, doovy, separator} = this.state;743 return <div>{`${groovy}${separator}${doovy}`}</div>;744 }745 },746 );747 const shallowRenderer = createRenderer();748 const result = shallowRenderer.render(<SimpleComponent />);749 expect(result).toEqual(<div>doovy-doovy</div>);750 });751 it('can setState in componentWillReceiveProps when shallow rendering', () => {752 const SimpleComponent = React.memo(753 class SimpleComponent extends React.Component {754 state = {count: 0};755 UNSAFE_componentWillReceiveProps(nextProps) {756 if (nextProps.updateState) {757 this.setState({count: 1});758 }759 }760 render() {761 return <div>{this.state.count}</div>;762 }763 },764 );765 const shallowRenderer = createRenderer();766 let result = shallowRenderer.render(767 <SimpleComponent updateState={false} />,768 );769 expect(result.props.children).toEqual(0);770 result = shallowRenderer.render(<SimpleComponent updateState={true} />);771 expect(result.props.children).toEqual(1);772 });773 it('can update state with static getDerivedStateFromProps when shallow rendering', () => {774 const SimpleComponent = React.memo(775 class SimpleComponent extends React.Component {776 state = {count: 1};777 static getDerivedStateFromProps(nextProps, prevState) {778 if (nextProps.updateState) {779 return {count: nextProps.incrementBy + prevState.count};780 }781 return null;782 }783 render() {784 return <div>{this.state.count}</div>;785 }786 },787 );788 const shallowRenderer = createRenderer();789 let result = shallowRenderer.render(790 <SimpleComponent updateState={false} incrementBy={0} />,791 );792 expect(result.props.children).toEqual(1);793 result = shallowRenderer.render(794 <SimpleComponent updateState={true} incrementBy={2} />,795 );796 expect(result.props.children).toEqual(3);797 result = shallowRenderer.render(798 <SimpleComponent updateState={false} incrementBy={2} />,799 );800 expect(result.props.children).toEqual(3);801 });802 it('should not override state with stale values if prevState is spread within getDerivedStateFromProps', () => {803 const SimpleComponent = React.memo(804 class SimpleComponent extends React.Component {805 state = {value: 0};806 static getDerivedStateFromProps(nextProps, prevState) {807 return {...prevState};808 }809 updateState = () => {810 this.setState(state => ({value: state.value + 1}));811 };812 render() {813 return <div>{`value:${this.state.value}`}</div>;814 }815 },816 );817 const shallowRenderer = createRenderer();818 let result = shallowRenderer.render(<SimpleComponent />);819 expect(result).toEqual(<div>value:0</div>);820 const instance = shallowRenderer.getMountedInstance();821 instance.updateState();822 result = shallowRenderer.getRenderOutput();823 expect(result).toEqual(<div>value:1</div>);824 });825 it('should pass previous state to shouldComponentUpdate even with getDerivedStateFromProps', () => {826 const SimpleComponent = React.memo(827 class SimpleComponent extends React.Component {828 constructor(props) {829 super(props);830 this.state = {831 value: props.value,832 };833 }834 static getDerivedStateFromProps(nextProps, prevState) {835 if (nextProps.value === prevState.value) {836 return null;837 }838 return {value: nextProps.value};839 }840 shouldComponentUpdate(nextProps, nextState) {841 return nextState.value !== this.state.value;842 }843 render() {844 return <div>{`value:${this.state.value}`}</div>;845 }846 },847 );848 const shallowRenderer = createRenderer();849 const initialResult = shallowRenderer.render(850 <SimpleComponent value="initial" />,851 );852 expect(initialResult).toEqual(<div>value:initial</div>);853 const updatedResult = shallowRenderer.render(854 <SimpleComponent value="updated" />,855 );856 expect(updatedResult).toEqual(<div>value:updated</div>);857 });858 it('can setState with an updater function', () => {859 let instance;860 const SimpleComponent = React.memo(861 class SimpleComponent extends React.Component {862 state = {863 counter: 0,864 };865 render() {866 instance = this;867 return (868 <button ref="button" onClick={this.onClick}>869 {this.state.counter}870 </button>871 );872 }873 },874 );875 const shallowRenderer = createRenderer();876 let result = shallowRenderer.render(<SimpleComponent defaultCount={1} />);877 expect(result.props.children).toEqual(0);878 instance.setState((state, props) => {879 return {counter: props.defaultCount + 1};880 });881 result = shallowRenderer.getRenderOutput();882 expect(result.props.children).toEqual(2);883 });884 it('can access component instance from setState updater function', done => {885 let instance;886 const SimpleComponent = React.memo(887 class SimpleComponent extends React.Component {888 state = {};889 render() {890 instance = this;891 return null;892 }893 },894 );895 const shallowRenderer = createRenderer();896 shallowRenderer.render(<SimpleComponent />);897 instance.setState(function updater(state, props) {898 expect(this).toBe(instance);899 done();900 });901 });902 it('can setState with a callback', () => {903 let instance;904 const SimpleComponent = React.memo(905 class SimpleComponent extends React.Component {906 state = {907 counter: 0,908 };909 render() {910 instance = this;911 return <p>{this.state.counter}</p>;912 }913 },914 );915 const shallowRenderer = createRenderer();916 const result = shallowRenderer.render(<SimpleComponent />);917 expect(result.props.children).toBe(0);918 const callback = jest.fn(function() {919 expect(this).toBe(instance);920 });921 instance.setState({counter: 1}, callback);922 const updated = shallowRenderer.getRenderOutput();923 expect(updated.props.children).toBe(1);924 expect(callback).toHaveBeenCalled();925 });926 it('can replaceState with a callback', () => {927 let instance;928 const SimpleComponent = React.memo(929 class SimpleComponent extends React.Component {930 state = {931 counter: 0,932 };933 render() {934 instance = this;935 return <p>{this.state.counter}</p>;936 }937 },938 );939 const shallowRenderer = createRenderer();940 const result = shallowRenderer.render(<SimpleComponent />);941 expect(result.props.children).toBe(0);942 const callback = jest.fn(function() {943 expect(this).toBe(instance);944 });945 // No longer a public API, but we can test that it works internally by946 // reaching into the updater.947 shallowRenderer._updater.enqueueReplaceState(948 instance,949 {counter: 1},950 callback,951 );952 const updated = shallowRenderer.getRenderOutput();953 expect(updated.props.children).toBe(1);954 expect(callback).toHaveBeenCalled();955 });956 it('can forceUpdate with a callback', () => {957 let instance;958 const SimpleComponent = React.memo(959 class SimpleComponent extends React.Component {960 state = {961 counter: 0,962 };963 render() {964 instance = this;965 return <p>{this.state.counter}</p>;966 }967 },968 );969 const shallowRenderer = createRenderer();970 const result = shallowRenderer.render(<SimpleComponent />);971 expect(result.props.children).toBe(0);972 const callback = jest.fn(function() {973 expect(this).toBe(instance);974 });975 instance.forceUpdate(callback);976 const updated = shallowRenderer.getRenderOutput();977 expect(updated.props.children).toBe(0);978 expect(callback).toHaveBeenCalled();979 });980 it('can pass context when shallowly rendering', () => {981 const SimpleComponent = React.memo(982 class SimpleComponent extends React.Component {983 static contextTypes = {984 name: PropTypes.string,985 };986 render() {987 return <div>{this.context.name}</div>;988 }989 },990 );991 const shallowRenderer = createRenderer();992 const result = shallowRenderer.render(<SimpleComponent />, {993 name: 'foo',994 });995 expect(result).toEqual(<div>foo</div>);996 });997 it('should track context across updates', () => {998 const SimpleComponent = React.memo(999 class SimpleComponent extends React.Component {1000 static contextTypes = {1001 foo: PropTypes.string,1002 };1003 state = {1004 bar: 'bar',1005 };1006 render() {1007 return <div>{`${this.context.foo}:${this.state.bar}`}</div>;1008 }1009 },1010 );1011 const shallowRenderer = createRenderer();1012 let result = shallowRenderer.render(<SimpleComponent />, {1013 foo: 'foo',1014 });1015 expect(result).toEqual(<div>foo:bar</div>);1016 const instance = shallowRenderer.getMountedInstance();1017 instance.setState({bar: 'baz'});1018 result = shallowRenderer.getRenderOutput();1019 expect(result).toEqual(<div>foo:baz</div>);1020 });1021 it('should filter context by contextTypes', () => {1022 const SimpleComponent = React.memo(1023 class SimpleComponent extends React.Component {1024 static contextTypes = {1025 foo: PropTypes.string,1026 };1027 render() {1028 return <div>{`${this.context.foo}:${this.context.bar}`}</div>;1029 }1030 },1031 );1032 const shallowRenderer = createRenderer();1033 const result = shallowRenderer.render(<SimpleComponent />, {1034 foo: 'foo',1035 bar: 'bar',1036 });1037 expect(result).toEqual(<div>foo:undefined</div>);1038 });1039 it('can fail context when shallowly rendering', () => {1040 const SimpleComponent = React.memo(1041 class SimpleComponent extends React.Component {1042 static contextTypes = {1043 name: PropTypes.string.isRequired,1044 };1045 render() {1046 return <div>{this.context.name}</div>;1047 }1048 },1049 );1050 const shallowRenderer = createRenderer();1051 expect(() => shallowRenderer.render(<SimpleComponent />)).toErrorDev(1052 'Warning: Failed context type: The context `name` is marked as ' +1053 'required in `SimpleComponent`, but its value is `undefined`.\n' +1054 ' in SimpleComponent (at **)',1055 );1056 });1057 it('should warn about propTypes (but only once)', () => {1058 const SimpleComponent = React.memo(1059 class SimpleComponent extends React.Component {1060 static propTypes = {1061 name: PropTypes.string.isRequired,1062 };1063 render() {1064 return React.createElement('div', null, this.props.name);1065 }1066 },1067 );1068 const shallowRenderer = createRenderer();1069 expect(() =>1070 shallowRenderer.render(React.createElement(SimpleComponent, {name: 123})),1071 ).toErrorDev(1072 'Warning: Failed prop type: Invalid prop `name` of type `number` ' +1073 'supplied to `SimpleComponent`, expected `string`.\n' +1074 ' in SimpleComponent',1075 );1076 });1077 it('should enable rendering of cloned element', () => {1078 const SimpleComponent = React.memo(1079 class SimpleComponent extends React.Component {1080 constructor(props) {1081 super(props);1082 this.state = {1083 bar: 'bar',1084 };1085 }1086 render() {1087 return <div>{`${this.props.foo}:${this.state.bar}`}</div>;1088 }1089 },1090 );1091 const shallowRenderer = createRenderer();1092 const el = <SimpleComponent foo="foo" />;1093 let result = shallowRenderer.render(el);1094 expect(result).toEqual(<div>foo:bar</div>);1095 const cloned = React.cloneElement(el, {foo: 'baz'});1096 result = shallowRenderer.render(cloned);1097 expect(result).toEqual(<div>baz:bar</div>);1098 });1099 it('this.state should be updated on setState callback inside componentWillMount', () => {1100 let stateSuccessfullyUpdated = false;1101 const Component = React.memo(1102 class Component extends React.Component {1103 constructor(props, context) {1104 super(props, context);1105 this.state = {1106 hasUpdatedState: false,1107 };1108 }1109 UNSAFE_componentWillMount() {1110 this.setState(1111 {hasUpdatedState: true},1112 () => (stateSuccessfullyUpdated = this.state.hasUpdatedState),1113 );1114 }1115 render() {1116 return <div>{this.props.children}</div>;1117 }1118 },1119 );1120 const shallowRenderer = createRenderer();1121 shallowRenderer.render(<Component />);1122 expect(stateSuccessfullyUpdated).toBe(true);1123 });1124 it('should handle multiple callbacks', () => {1125 const mockFn = jest.fn();1126 const shallowRenderer = createRenderer();1127 const Component = React.memo(1128 class Component extends React.Component {1129 constructor(props, context) {1130 super(props, context);1131 this.state = {1132 foo: 'foo',1133 };1134 }1135 UNSAFE_componentWillMount() {1136 this.setState({foo: 'bar'}, () => mockFn());1137 this.setState({foo: 'foobar'}, () => mockFn());1138 }1139 render() {1140 return <div>{this.state.foo}</div>;1141 }1142 },1143 );1144 shallowRenderer.render(<Component />);1145 expect(mockFn).toHaveBeenCalledTimes(2);1146 // Ensure the callback queue is cleared after the callbacks are invoked1147 const mountedInstance = shallowRenderer.getMountedInstance();1148 mountedInstance.setState({foo: 'bar'}, () => mockFn());1149 expect(mockFn).toHaveBeenCalledTimes(3);1150 });1151 it('should call the setState callback even if shouldComponentUpdate = false', done => {1152 const mockFn = jest.fn().mockReturnValue(false);1153 const Component = React.memo(1154 class Component extends React.Component {1155 constructor(props, context) {1156 super(props, context);1157 this.state = {1158 hasUpdatedState: false,1159 };1160 }1161 shouldComponentUpdate() {1162 return mockFn();1163 }1164 render() {1165 return <div>{this.state.hasUpdatedState}</div>;1166 }1167 },1168 );1169 const shallowRenderer = createRenderer();1170 shallowRenderer.render(<Component />);1171 const mountedInstance = shallowRenderer.getMountedInstance();1172 mountedInstance.setState({hasUpdatedState: true}, () => {1173 expect(mockFn).toBeCalled();1174 expect(mountedInstance.state.hasUpdatedState).toBe(true);1175 done();1176 });1177 });1178 it('throws usefully when rendering badly-typed elements', () => {1179 const shallowRenderer = createRenderer();1180 const renderAndVerifyWarningAndError = (Component, typeString) => {1181 expect(() => {1182 expect(() => shallowRenderer.render(<Component />)).toErrorDev(1183 'React.createElement: type is invalid -- expected a string ' +1184 '(for built-in components) or a class/function (for composite components) ' +1185 `but got: ${typeString}.`,1186 );1187 }).toThrowError(1188 'ReactShallowRenderer render(): Shallow rendering works only with custom ' +1189 `components, but the provided element type was \`${typeString}\`.`,1190 );1191 };1192 renderAndVerifyWarningAndError(undefined, 'undefined');1193 renderAndVerifyWarningAndError(null, 'null');1194 renderAndVerifyWarningAndError([], 'array');1195 renderAndVerifyWarningAndError({}, 'object');1196 });1197 it('should have initial state of null if not defined', () => {1198 const SomeComponent = React.memo(1199 class SomeComponent extends React.Component {1200 render() {1201 return <span />;1202 }1203 },1204 );1205 const shallowRenderer = createRenderer();1206 shallowRenderer.render(<SomeComponent />);1207 expect(shallowRenderer.getMountedInstance().state).toBeNull();1208 });1209 it('should invoke both deprecated and new lifecycles if both are present', () => {1210 const log = [];1211 const Component = React.memo(1212 class Component extends React.Component {1213 componentWillMount() {1214 log.push('componentWillMount');1215 }1216 componentWillReceiveProps() {1217 log.push('componentWillReceiveProps');1218 }1219 componentWillUpdate() {1220 log.push('componentWillUpdate');1221 }1222 UNSAFE_componentWillMount() {1223 log.push('UNSAFE_componentWillMount');1224 }1225 UNSAFE_componentWillReceiveProps() {1226 log.push('UNSAFE_componentWillReceiveProps');1227 }1228 UNSAFE_componentWillUpdate() {1229 log.push('UNSAFE_componentWillUpdate');1230 }1231 render() {1232 return null;1233 }1234 },1235 );1236 const shallowRenderer = createRenderer();1237 shallowRenderer.render(<Component foo="bar" />);1238 expect(log).toEqual(['componentWillMount', 'UNSAFE_componentWillMount']);1239 log.length = 0;1240 shallowRenderer.render(<Component foo="baz" />);1241 expect(log).toEqual([1242 'componentWillReceiveProps',1243 'UNSAFE_componentWillReceiveProps',1244 'componentWillUpdate',1245 'UNSAFE_componentWillUpdate',1246 ]);1247 });1248 it('should stop the update when setState returns null or undefined', () => {1249 const log = [];1250 let instance;1251 const Component = React.memo(1252 class Component extends React.Component {1253 constructor(props) {1254 super(props);1255 this.state = {1256 count: 0,1257 };1258 }1259 render() {1260 log.push('render');1261 instance = this;1262 return null;1263 }1264 },1265 );1266 const shallowRenderer = createRenderer();1267 shallowRenderer.render(<Component />);1268 log.length = 0;1269 instance.setState(() => null);1270 instance.setState(() => undefined);1271 instance.setState(null);1272 instance.setState(undefined);1273 expect(log).toEqual([]);1274 instance.setState(state => ({count: state.count + 1}));1275 expect(log).toEqual(['render']);1276 });1277 it('should not get this in a function component', () => {1278 const logs = [];1279 const Foo = React.memo(function Foo() {1280 logs.push(this);1281 return <div>foo</div>;1282 });1283 const shallowRenderer = createRenderer();1284 shallowRenderer.render(<Foo foo="bar" />);1285 expect(logs).toEqual([undefined]);1286 });...

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ReactShallowRenderer-test.js

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1/**2 * Copyright 2013-present, Facebook, Inc.3 * All rights reserved.4 *5 * This source code is licensed under the BSD-style license found in the6 * LICENSE file in the root directory of this source tree. An additional grant7 * of patent rights can be found in the PATENTS file in the same directory.8 *9 * @emails react-core10 */11'use strict';12let createRenderer;13let PropTypes;14let React;15describe('ReactShallowRenderer', () => {16 beforeEach(() => {17 createRenderer = require('react-test-renderer/shallow').createRenderer;18 PropTypes = require('prop-types');19 React = require('react');20 });21 it('should call all of the lifecycle hooks', () => {22 const logs = [];23 const logger = message => () => logs.push(message) || true;24 class SomeComponent extends React.Component {25 componentWillMount = logger('componentWillMount');26 componentDidMount = logger('componentDidMount');27 componentWillReceiveProps = logger('componentWillReceiveProps');28 shouldComponentUpdate = logger('shouldComponentUpdate');29 componentWillUpdate = logger('componentWillUpdate');30 componentDidUpdate = logger('componentDidUpdate');31 componentWillUnmount = logger('componentWillUnmount');32 render() {33 return <div />;34 }35 }36 const shallowRenderer = createRenderer();37 shallowRenderer.render(<SomeComponent foo={1} />);38 // Calling cDU might lead to problems with host component references.39 // Since our components aren't really mounted, refs won't be available.40 expect(logs).toEqual(['componentWillMount']);41 logs.splice(0);42 const instance = shallowRenderer.getMountedInstance();43 instance.setState({});44 expect(logs).toEqual(['shouldComponentUpdate', 'componentWillUpdate']);45 logs.splice(0);46 shallowRenderer.render(<SomeComponent foo={2} />);47 // The previous shallow renderer did not trigger cDU for props changes.48 expect(logs).toEqual([49 'componentWillReceiveProps',50 'shouldComponentUpdate',51 'componentWillUpdate',52 ]);53 });54 it('should only render 1 level deep', () => {55 function Parent() {56 return <div><Child /></div>;57 }58 function Child() {59 throw Error('This component should not render');60 }61 const shallowRenderer = createRenderer();62 shallowRenderer.render(React.createElement(Parent));63 });64 it('should have shallow rendering', () => {65 class SomeComponent extends React.Component {66 render() {67 return (68 <div>69 <span className="child1" />70 <span className="child2" />71 </div>72 );73 }74 }75 const shallowRenderer = createRenderer();76 const result = shallowRenderer.render(<SomeComponent />);77 expect(result.type).toBe('div');78 expect(result.props.children).toEqual([79 <span className="child1" />,80 <span className="child2" />,81 ]);82 });83 it('should enable shouldComponentUpdate to prevent a re-render', () => {84 let renderCounter = 0;85 class SimpleComponent extends React.Component {86 state = {update: false};87 shouldComponentUpdate(nextProps, nextState) {88 return this.state.update !== nextState.update;89 }90 render() {91 renderCounter++;92 return <div>{`${renderCounter}`}</div>;93 }94 }95 const shallowRenderer = createRenderer();96 shallowRenderer.render(<SimpleComponent />);97 expect(shallowRenderer.getRenderOutput()).toEqual(<div>1</div>);98 const instance = shallowRenderer.getMountedInstance();99 instance.setState({update: false});100 expect(shallowRenderer.getRenderOutput()).toEqual(<div>1</div>);101 instance.setState({update: true});102 expect(shallowRenderer.getRenderOutput()).toEqual(<div>2</div>);103 });104 it('should shallow render a functional component', () => {105 function SomeComponent(props, context) {106 return (107 <div>108 <div>{props.foo}</div>109 <div>{context.bar}</div>110 <span className="child1" />111 <span className="child2" />112 </div>113 );114 }115 const shallowRenderer = createRenderer();116 const result = shallowRenderer.render(<SomeComponent foo={'FOO'} />, {117 bar: 'BAR',118 });119 expect(result.type).toBe('div');120 expect(result.props.children).toEqual([121 <div>FOO</div>,122 <div>BAR</div>,123 <span className="child1" />,124 <span className="child2" />,125 ]);126 });127 it('should shallow render a component returning strings directly from render', () => {128 const Text = ({value}) => value;129 const shallowRenderer = createRenderer();130 const result = shallowRenderer.render(<Text value="foo" />);131 expect(result).toEqual('foo');132 });133 it('should shallow render a component returning numbers directly from render', () => {134 const Text = ({value}) => value;135 const shallowRenderer = createRenderer();136 const result = shallowRenderer.render(<Text value={10} />);137 expect(result).toEqual(10);138 });139 it('should shallow render a fragment', () => {140 class SomeComponent extends React.Component {141 render() {142 return <div />;143 }144 }145 class Fragment extends React.Component {146 render() {147 return [<div key="a" />, <span key="b" />, <SomeComponent />];148 }149 }150 const shallowRenderer = createRenderer();151 const result = shallowRenderer.render(<Fragment />);152 expect(result).toEqual([153 <div key="a" />,154 <span key="b" />,155 <SomeComponent />,156 ]);157 });158 it('should throw for invalid elements', () => {159 class SomeComponent extends React.Component {160 render() {161 return <div />;162 }163 }164 const shallowRenderer = createRenderer();165 expect(() => shallowRenderer.render(SomeComponent)).toThrowError(166 'ReactShallowRenderer render(): Invalid component element. Instead of ' +167 'passing a component class, make sure to instantiate it by passing it ' +168 'to React.createElement.',169 );170 expect(() => shallowRenderer.render(<div />)).toThrowError(171 'ReactShallowRenderer render(): Shallow rendering works only with ' +172 'custom components, not primitives (div). Instead of calling ' +173 '`.render(el)` and inspecting the rendered output, look at `el.props` ' +174 'directly instead.',175 );176 });177 it('should have shallow unmounting', () => {178 const componentWillUnmount = jest.fn();179 class SomeComponent extends React.Component {180 componentWillUnmount = componentWillUnmount;181 render() {182 return <div />;183 }184 }185 const shallowRenderer = createRenderer();186 shallowRenderer.render(<SomeComponent />);187 shallowRenderer.unmount();188 expect(componentWillUnmount).toBeCalled();189 });190 it('can shallow render to null', () => {191 class SomeComponent extends React.Component {192 render() {193 return null;194 }195 }196 const shallowRenderer = createRenderer();197 const result = shallowRenderer.render(<SomeComponent />);198 expect(result).toBe(null);199 });200 it('can shallow render with a ref', () => {201 class SomeComponent extends React.Component {202 render() {203 return <div ref="hello" />;204 }205 }206 const shallowRenderer = createRenderer();207 // Shouldn't crash.208 shallowRenderer.render(<SomeComponent />);209 });210 it('lets you update shallowly rendered components', () => {211 class SomeComponent extends React.Component {212 state = {clicked: false};213 onClick = () => {214 this.setState({clicked: true});215 };216 render() {217 const className = this.state.clicked ? 'was-clicked' : '';218 if (this.props.aNew === 'prop') {219 return (220 <a href="#" onClick={this.onClick} className={className}>221 Test link222 </a>223 );224 } else {225 return (226 <div>227 <span className="child1" />228 <span className="child2" />229 </div>230 );231 }232 }233 }234 const shallowRenderer = createRenderer();235 const result = shallowRenderer.render(<SomeComponent />);236 expect(result.type).toBe('div');237 expect(result.props.children).toEqual([238 <span className="child1" />,239 <span className="child2" />,240 ]);241 const updatedResult = shallowRenderer.render(<SomeComponent aNew="prop" />);242 expect(updatedResult.type).toBe('a');243 const mockEvent = {};244 updatedResult.props.onClick(mockEvent);245 const updatedResultCausedByClick = shallowRenderer.getRenderOutput();246 expect(updatedResultCausedByClick.type).toBe('a');247 expect(updatedResultCausedByClick.props.className).toBe('was-clicked');248 });249 it('can access the mounted component instance', () => {250 class SimpleComponent extends React.Component {251 someMethod = () => {252 return this.props.n;253 };254 render() {255 return <div>{this.props.n}</div>;256 }257 }258 const shallowRenderer = createRenderer();259 shallowRenderer.render(<SimpleComponent n={5} />);260 expect(shallowRenderer.getMountedInstance().someMethod()).toEqual(5);261 });262 it('can shallowly render components with contextTypes', () => {263 class SimpleComponent extends React.Component {264 static contextTypes = {265 name: PropTypes.string,266 };267 render() {268 return <div />;269 }270 }271 const shallowRenderer = createRenderer();272 const result = shallowRenderer.render(<SimpleComponent />);273 expect(result).toEqual(<div />);274 });275 it('passes expected params to component lifecycle methods', () => {276 const componentDidUpdateParams = [];277 const componentWillReceivePropsParams = [];278 const componentWillUpdateParams = [];279 const setStateParams = [];280 const shouldComponentUpdateParams = [];281 const initialProp = {prop: 'init prop'};282 const initialState = {state: 'init state'};283 const initialContext = {context: 'init context'};284 const updatedState = {state: 'updated state'};285 const updatedProp = {prop: 'updated prop'};286 const updatedContext = {context: 'updated context'};287 class SimpleComponent extends React.Component {288 constructor(props, context) {289 super(props, context);290 this.state = initialState;291 }292 componentDidUpdate(...args) {293 componentDidUpdateParams.push(...args);294 }295 componentWillReceiveProps(...args) {296 componentWillReceivePropsParams.push(...args);297 this.setState((...innerArgs) => {298 setStateParams.push(...innerArgs);299 return updatedState;300 });301 }302 componentWillUpdate(...args) {303 componentWillUpdateParams.push(...args);304 }305 shouldComponentUpdate(...args) {306 shouldComponentUpdateParams.push(...args);307 return true;308 }309 render() {310 return null;311 }312 }313 const shallowRenderer = createRenderer();314 // No lifecycle hooks should be invoked on initial render315 shallowRenderer.render(316 React.createElement(SimpleComponent, initialProp),317 initialContext,318 );319 expect(componentDidUpdateParams).toEqual([]);320 expect(componentWillReceivePropsParams).toEqual([]);321 expect(componentWillUpdateParams).toEqual([]);322 expect(setStateParams).toEqual([]);323 expect(shouldComponentUpdateParams).toEqual([]);324 // Lifecycle hooks should be invoked with the correct prev/next params on update.325 shallowRenderer.render(326 React.createElement(SimpleComponent, updatedProp),327 updatedContext,328 );329 expect(componentWillReceivePropsParams).toEqual([330 updatedProp,331 updatedContext,332 ]);333 expect(setStateParams).toEqual([initialState, initialProp]);334 expect(shouldComponentUpdateParams).toEqual([335 updatedProp,336 updatedState,337 updatedContext,338 ]);339 expect(componentWillUpdateParams).toEqual([340 updatedProp,341 updatedState,342 updatedContext,343 ]);344 expect(componentDidUpdateParams).toEqual([]);345 });346 it('can shallowly render components with ref as function', () => {347 class SimpleComponent extends React.Component {348 state = {clicked: false};349 handleUserClick = () => {350 this.setState({clicked: true});351 };352 render() {353 return (354 <div355 ref={() => {}}356 onClick={this.handleUserClick}357 className={this.state.clicked ? 'clicked' : ''}358 />359 );360 }361 }362 const shallowRenderer = createRenderer();363 shallowRenderer.render(<SimpleComponent />);364 let result = shallowRenderer.getRenderOutput();365 expect(result.type).toEqual('div');366 expect(result.props.className).toEqual('');367 result.props.onClick();368 result = shallowRenderer.getRenderOutput();369 expect(result.type).toEqual('div');370 expect(result.props.className).toEqual('clicked');371 });372 it('can setState in componentWillMount when shallow rendering', () => {373 class SimpleComponent extends React.Component {374 componentWillMount() {375 this.setState({groovy: 'doovy'});376 }377 render() {378 return <div>{this.state.groovy}</div>;379 }380 }381 const shallowRenderer = createRenderer();382 const result = shallowRenderer.render(<SimpleComponent />);383 expect(result).toEqual(<div>doovy</div>);384 });385 it('can setState in componentWillReceiveProps when shallow rendering', () => {386 class SimpleComponent extends React.Component {387 state = {count: 0};388 componentWillReceiveProps(nextProps) {389 if (nextProps.updateState) {390 this.setState({count: 1});391 }392 }393 render() {394 return <div>{this.state.count}</div>;395 }396 }397 const shallowRenderer = createRenderer();398 let result = shallowRenderer.render(399 <SimpleComponent updateState={false} />,400 );401 expect(result.props.children).toEqual(0);402 result = shallowRenderer.render(<SimpleComponent updateState={true} />);403 expect(result.props.children).toEqual(1);404 });405 it('can setState with an updater function', () => {406 let instance;407 class SimpleComponent extends React.Component {408 state = {409 counter: 0,410 };411 render() {412 instance = this;413 return (414 <button ref="button" onClick={this.onClick}>415 {this.state.counter}416 </button>417 );418 }419 }420 const shallowRenderer = createRenderer();421 let result = shallowRenderer.render(<SimpleComponent defaultCount={1} />);422 expect(result.props.children).toEqual(0);423 instance.setState((state, props) => {424 return {counter: props.defaultCount + 1};425 });426 result = shallowRenderer.getRenderOutput();427 expect(result.props.children).toEqual(2);428 });429 it('can setState with a callback', () => {430 let instance;431 class SimpleComponent extends React.Component {432 state = {433 counter: 0,434 };435 render() {436 instance = this;437 return (438 <p>439 {this.state.counter}440 </p>441 );442 }443 }444 const shallowRenderer = createRenderer();445 const result = shallowRenderer.render(<SimpleComponent />);446 expect(result.props.children).toBe(0);447 const callback = jest.fn(function() {448 expect(this).toBe(instance);449 });450 instance.setState({counter: 1}, callback);451 const updated = shallowRenderer.getRenderOutput();452 expect(updated.props.children).toBe(1);453 expect(callback).toHaveBeenCalled();454 });455 it('can replaceState with a callback', () => {456 let instance;457 class SimpleComponent extends React.Component {458 state = {459 counter: 0,460 };461 render() {462 instance = this;463 return (464 <p>465 {this.state.counter}466 </p>467 );468 }469 }470 const shallowRenderer = createRenderer();471 const result = shallowRenderer.render(<SimpleComponent />);472 expect(result.props.children).toBe(0);473 const callback = jest.fn(function() {474 expect(this).toBe(instance);475 });476 // No longer a public API, but we can test that it works internally by477 // reaching into the updater.478 shallowRenderer._updater.enqueueReplaceState(479 instance,480 {counter: 1},481 callback,482 );483 const updated = shallowRenderer.getRenderOutput();484 expect(updated.props.children).toBe(1);485 expect(callback).toHaveBeenCalled();486 });487 it('can forceUpdate with a callback', () => {488 let instance;489 class SimpleComponent extends React.Component {490 state = {491 counter: 0,492 };493 render() {494 instance = this;495 return (496 <p>497 {this.state.counter}498 </p>499 );500 }501 }502 const shallowRenderer = createRenderer();503 const result = shallowRenderer.render(<SimpleComponent />);504 expect(result.props.children).toBe(0);505 const callback = jest.fn(function() {506 expect(this).toBe(instance);507 });508 instance.forceUpdate(callback);509 const updated = shallowRenderer.getRenderOutput();510 expect(updated.props.children).toBe(0);511 expect(callback).toHaveBeenCalled();512 });513 it('can pass context when shallowly rendering', () => {514 class SimpleComponent extends React.Component {515 static contextTypes = {516 name: PropTypes.string,517 };518 render() {519 return <div>{this.context.name}</div>;520 }521 }522 const shallowRenderer = createRenderer();523 const result = shallowRenderer.render(<SimpleComponent />, {524 name: 'foo',525 });526 expect(result).toEqual(<div>foo</div>);527 });528 it('should track context across updates', () => {529 class SimpleComponent extends React.Component {530 static contextTypes = {531 foo: PropTypes.string,532 };533 state = {534 bar: 'bar',535 };536 render() {537 return <div>{`${this.context.foo}:${this.state.bar}`}</div>;538 }539 }540 const shallowRenderer = createRenderer();541 let result = shallowRenderer.render(<SimpleComponent />, {542 foo: 'foo',543 });544 expect(result).toEqual(<div>foo:bar</div>);545 const instance = shallowRenderer.getMountedInstance();546 instance.setState({bar: 'baz'});547 result = shallowRenderer.getRenderOutput();548 expect(result).toEqual(<div>foo:baz</div>);549 });550 it('can fail context when shallowly rendering', () => {551 spyOn(console, 'error');552 class SimpleComponent extends React.Component {553 static contextTypes = {554 name: PropTypes.string.isRequired,555 };556 render() {557 return <div>{this.context.name}</div>;558 }559 }560 const shallowRenderer = createRenderer();561 shallowRenderer.render(<SimpleComponent />);562 expectDev(console.error.calls.count()).toBe(1);563 expect(564 console.error.calls.argsFor(0)[0].replace(/\(at .+?:\d+\)/g, '(at **)'),565 ).toBe(566 'Warning: Failed context type: The context `name` is marked as ' +567 'required in `SimpleComponent`, but its value is `undefined`.\n' +568 ' in SimpleComponent (at **)',569 );570 });571 it('should warn about propTypes (but only once)', () => {572 spyOn(console, 'error');573 class SimpleComponent extends React.Component {574 render() {575 return React.createElement('div', null, this.props.name);576 }577 }578 SimpleComponent.propTypes = {579 name: PropTypes.string.isRequired,580 };581 const shallowRenderer = createRenderer();582 shallowRenderer.render(React.createElement(SimpleComponent, {name: 123}));583 expect(console.error.calls.count()).toBe(1);584 expect(585 console.error.calls.argsFor(0)[0].replace(/\(at .+?:\d+\)/g, '(at **)'),586 ).toBe(587 'Warning: Failed prop type: Invalid prop `name` of type `number` ' +588 'supplied to `SimpleComponent`, expected `string`.\n' +589 ' in SimpleComponent',590 );591 });592 it('should enable rendering of cloned element', () => {593 class SimpleComponent extends React.Component {594 constructor(props) {595 super(props);596 this.state = {597 bar: 'bar',598 };599 }600 render() {601 return <div>{`${this.props.foo}:${this.state.bar}`}</div>;602 }603 }604 const shallowRenderer = createRenderer();605 let result = shallowRenderer.render(<SimpleComponent foo="foo" />);606 expect(result).toEqual(<div>foo:bar</div>);607 const instance = shallowRenderer.getMountedInstance();608 const cloned = React.cloneElement(instance, {foo: 'baz'});609 result = shallowRenderer.render(cloned);610 expect(result).toEqual(<div>baz:bar</div>);611 });...

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media-queries.test.js

Source:media-queries.test.js Github

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1import React, { Component } from 'react'2import renderer from 'react-test-renderer'3import { mediaQueries } from './media-queries'4class SimpleComponent extends Component {5 render() {6 const {7 viewportIsMobile,8 viewportIsTabletOrLess,9 viewportIsXXS,10 viewportIsXSOrLess,11 viewportIsSOrLess,12 viewportIsMOrLess,13 viewportIsLOrLess,14 myCustomMediaQuery,15 ...props16 } = this.props17 return <div title="Test me!" {...props} />18 }19}20const mockAddListener = jest.fn()21const mockRemoveListener = jest.fn()22const createMockMediaMatcher = matches => () => {23 return {24 matches,25 addListener: mockAddListener,26 removeListener: mockRemoveListener,27 }28}29describe('mediaQueries()', () => {30 const originalMatchMedia = window.matchMedia31 let SimpleComponentWithMediaQueries32 let component33 let componentSnapshot34 beforeEach(() => {35 window.matchMedia = createMockMediaMatcher(false)36 })37 afterEach(() => {38 window.matchMedia = originalMatchMedia39 })40 describe('by default', () => {41 beforeEach(() => {42 SimpleComponentWithMediaQueries = mediaQueries(SimpleComponent, {43 viewportIsXSOrLess: true,44 viewportIsSOrLess: true,45 viewportIsMOrLess: true,46 viewportIsLOrLess: true,47 })48 component = mount(<SimpleComponentWithMediaQueries />)49 componentSnapshot = renderer50 .create(<SimpleComponentWithMediaQueries />)51 .toJSON()52 })53 it('renders the wrapped component', () => {54 expect(componentSnapshot).toMatchSnapshot()55 })56 it('pushes media queries props to wrapped component', () => {57 const wrappedComponent = component.find(SimpleComponent).first()58 expect(wrappedComponent.prop('viewportIsXXS')).toBeFalsy()59 expect(wrappedComponent.prop('viewportIsXSOrLess')).toBeFalsy()60 expect(wrappedComponent.prop('viewportIsSOrLess')).toBeFalsy()61 expect(wrappedComponent.prop('viewportIsMOrLess')).toBeFalsy()62 expect(wrappedComponent.prop('viewportIsLOrLess')).toBeFalsy()63 })64 it('attaches listeners', () => {65 expect(mockAddListener).toHaveBeenCalled()66 })67 it('removes listeners', () => {68 component.instance().componentWillUnmount()69 expect(mockRemoveListener).toHaveBeenCalled()70 })71 })72 describe('with M or less version', () => {73 beforeEach(() => {74 window.matchMedia = createMockMediaMatcher(true)75 SimpleComponentWithMediaQueries = mediaQueries(SimpleComponent, {76 viewportIsMOrLess: true,77 })78 component = mount(<SimpleComponentWithMediaQueries />)79 })80 it('pushes media queries props to wrapped component', () => {81 const wrappedComponent = component.find(SimpleComponent).first()82 expect(wrappedComponent.prop('viewportIsXXS')).toBeFalsy()83 expect(wrappedComponent.prop('viewportIsXSOrLess')).toBeFalsy()84 expect(wrappedComponent.prop('viewportIsSOrLess')).toBeFalsy()85 expect(wrappedComponent.prop('viewportIsMOrLess')).toBeTruthy()86 expect(wrappedComponent.prop('viewportIsLOrLess')).toBeFalsy()87 })88 })89 describe('with S or less version', () => {90 beforeEach(() => {91 window.matchMedia = createMockMediaMatcher(true)92 SimpleComponentWithMediaQueries = mediaQueries(SimpleComponent, {93 viewportIsSOrLess: true,94 })95 component = mount(<SimpleComponentWithMediaQueries />)96 })97 it('pushes media queries props to wrapped component', () => {98 const wrappedComponent = component.find(SimpleComponent).first()99 expect(wrappedComponent.prop('viewportIsXXS')).toBeFalsy()100 expect(wrappedComponent.prop('viewportIsXSOrLess')).toBeFalsy()101 expect(wrappedComponent.prop('viewportIsSOrLess')).toBeTruthy()102 expect(wrappedComponent.prop('viewportIsMOrLess')).toBeFalsy()103 expect(wrappedComponent.prop('viewportIsLOrLess')).toBeFalsy()104 })105 })106 describe('with custom media query', () => {107 beforeEach(() => {108 window.matchMedia = createMockMediaMatcher(true)109 SimpleComponentWithMediaQueries = mediaQueries(SimpleComponent, {110 myCustomMediaQuery: '(min-width: 1140px)',111 })112 component = mount(<SimpleComponentWithMediaQueries />)113 })114 it('pushes media queries props to wrapped component', () => {115 const wrappedComponent = component.find(SimpleComponent).first()116 expect(wrappedComponent.prop('myCustomMediaQuery')).toBeDefined()117 expect(wrappedComponent.prop('viewportIsXXS')).toBeFalsy()118 expect(wrappedComponent.prop('viewportIsXSOrLess')).toBeFalsy()119 expect(wrappedComponent.prop('viewportIsSOrLess')).toBeFalsy()120 expect(wrappedComponent.prop('viewportIsMOrLess')).toBeFalsy()121 expect(wrappedComponent.prop('viewportIsLOrLess')).toBeFalsy()122 })123 })124 describe('with deprecated versions', () => {125 beforeEach(() => {126 window.matchMedia = createMockMediaMatcher(true)127 SimpleComponentWithMediaQueries = mediaQueries(SimpleComponent, {128 viewportIsTabletOrLess: true,129 viewportIsMobile: true,130 })131 component = mount(<SimpleComponentWithMediaQueries />)132 })133 it('pushes media queries props to wrapped component', () => {134 const wrappedComponent = component.find(SimpleComponent).first()135 expect(wrappedComponent.prop('viewportIsTabletOrLess')).toBeTruthy()136 expect(wrappedComponent.prop('viewportIsMobile')).toBeTruthy()137 })138 })...

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index.jsx

Source:index.jsx Github

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1import React from "react";2import ReactDOM from "react-dom";3// Creates a re-usable `SimpleComponent` class.4class SimpleComponent extends React.Component {5 render() {6 return <h2>I am a SimpleComponent!</h2>;7 }8}9// Renders a SimpleComponent into #root.10document.addEventListener("DOMContentLoaded", function () {11 const root = document.querySelector("#root");12 ReactDOM.render(<SimpleComponent />, root);...

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Using AI Code Generation

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1import { SimpleComponent } from 'ng-mocks';2import { MyComponent } from './my.component';3describe('MyComponent', () => {4 it('should render', () => {5 const fixture = SimpleComponent(MyComponent);6 expect(fixture.nativeElement.innerHTML).toEqual('my-component');7 });8});9import { Component } from '@angular/core';10@Component({11})12export class MyComponent {}

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Using AI Code Generation

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1import { SimpleComponent } from './simple.component';2import { MockBuilder, MockRender } from 'ng-mocks';3describe('SimpleComponent', () => {4 beforeEach(() => MockBuilder(SimpleComponent));5 it('should create', () => {6 const fixture = MockRender(SimpleComponent);7 expect(fixture.point.componentInstance).toBeDefined();8 });9});10import { SimpleComponent } from './simple.component';11import { async, ComponentFixture, TestBed } from '@angular/core/testing';12describe('SimpleComponent', () => {13 let component: SimpleComponent;14 let fixture: ComponentFixture<SimpleComponent>;15 beforeEach(async(() => {16 TestBed.configureTestingModule({17 }).compileComponents();18 }));19 beforeEach(() => {20 fixture = TestBed.createComponent(SimpleComponent);21 component = fixture.componentInstance;22 fixture.detectChanges();23 });24 it('should create', () => {25 expect(component).toBeDefined();26 });27});

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Using AI Code Generation

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1import { SimpleComponent } from 'ng-mocks';2import { SomeComponent } from './some.component';3describe('SomeComponent', () => {4 it('should create', () => {5 const component = SimpleComponent(SomeComponent);6 expect(component).toBeTruthy();7 });8});9import { Component, OnInit } from '@angular/core';10@Component({11})12export class SomeComponent implements OnInit {13 constructor() { }14 ngOnInit() {15 }16}17p {18 color: red;19}20import { async, ComponentFixture, TestBed } from '@angular/core/testing';21import { SomeComponent } from './some.component';22describe('SomeComponent', () => {23 let component: SomeComponent;24 let fixture: ComponentFixture<SomeComponent>;25 beforeEach(async(() => {26 TestBed.configureTestingModule({27 })28 .compileComponents();29 }));30 beforeEach(() => {31 fixture = TestBed.createComponent(SomeComponent);32 component = fixture.componentInstance;33 fixture.detectChanges();34 });35 it('should create', () => {36 expect(component).toBeTruthy();37 });38});39Chrome 75.0.3770 (Mac OS X 10.14.4) SomeComponent should create FAILED40Chrome 75.0.3770 (Mac OS X 10.14.4): Executed 1 of 1 (1 FAILED) (0.005 secs / 0 secs)

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Using AI Code Generation

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1import { SimpleComponent } from 'ng-mocks';2import { MyComponent } from './my-component';3describe('MyComponent', () => {4 it('should render', () => {5 const fixture = SimpleComponent(MyComponent, {6 });7 expect(fixture).toBeDefined();8 });9});10import { Component } from '@angular/core';11@Component({12})13export class MyComponent {}14import { ComponentFixture, TestBed } from '@angular/core/testing';15import { MyComponent } from './my-component';16describe('MyComponent', () => {17 let component: MyComponent;18 let fixture: ComponentFixture<MyComponent>;19 beforeEach(() => {20 TestBed.configureTestingModule({21 }).compileComponents();22 fixture = TestBed.createComponent(MyComponent);23 component = fixture.componentInstance;24 fixture.detectChanges();25 });26 it('should render', () => {27 expect(component).toBeDefined();28 });29});

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Using AI Code Generation

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1import {SimpleComponent} from 'ng-mocks';2describe('SimpleComponent', () => {3 it('should create', () => {4 expect(SimpleComponent).toBeTruthy();5 });6});7import './test.js';8{9 "compilerOptions": {10 "importHelpers": true,11 "paths": {12 }13 }14}15{16 "scripts": {17 },18 "dependencies": {19 },20 "devDependencies": {

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Using AI Code Generation

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1import { SimpleComponent } from 'ng-mocks';2let fixture = TestBed.createComponent(SimpleComponent);3let component = fixture.componentInstance;4component.ngOnInit();5fixture.detectChanges();6expect(component).toBeTruthy();7expect(component).toBeInstanceOf(SimpleComponent);8expect(component).toBeInstanceOf(MyComponent);9expect(component).not.toBeInstanceOf(OtherComponent);10import { MockComponent } from 'ng-mocks';11let fixture = TestBed.createComponent(MockComponent(MyComponent));12let component = fixture.componentInstance;13component.ngOnInit();14fixture.detectChanges();15expect(component).toBeTruthy();16expect(component).toBeInstanceOf(MyComponent);17expect(component).not.toBeInstanceOf(SimpleComponent);18expect(component).not.toBeInstanceOf(OtherComponent);19import { MockDirective } from 'ng-mocks';20let fixture = TestBed.createComponent(MockDirective(MyDirective));21let component = fixture.componentInstance;22component.ngOnInit();23fixture.detectChanges();24expect(component).toBeTruthy();25expect(component).toBeInstanceOf(MyDirective);26expect(component).not.toBeInstanceOf(SimpleComponent);27expect(component).not.toBeInstanceOf(OtherComponent);28import { MockPipe } from 'ng-mocks';29let fixture = TestBed.createComponent(MockPipe(MyPipe));30let component = fixture.componentInstance;31component.ngOnInit();32fixture.detectChanges();33expect(component).toBeTruthy();34expect(component).toBeInstanceOf(MyPipe);35expect(component).not.toBeInstanceOf(SimpleComponent);36expect(component).not.toBeInstanceOf(OtherComponent);37import { MockRender } from 'ng-mocks';38let component = MockRender(MyComponent);39expect(component).toBeTruthy();40expect(component).toBeInstanceOf(MyComponent);41expect(component).not.toBeInstanceOf(SimpleComponent);42expect(component).not.toBeInstanceOf(OtherComponent);43import { MockService } from 'ng-mocks';44let service = MockService(MyService);45expect(service).toBeTruthy();46expect(service).toBeInstanceOf(MyService);47expect(service).not.toBeInstanceOf(SimpleComponent);48expect(service).not.toBeInstanceOf(OtherComponent);49import { MockBuilder } from 'ng-mocks';50let fixture = MockBuilder(MyComponent);

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Using AI Code Generation

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1import { SimpleComponent } from 'ng-mocks';2const fixture = new SimpleComponent(MyComponent, {some: 'data'});3import { MockComponent } from 'ng-mocks';4const fixture = MockComponent(MyComponent, {some: 'data'});5import { MockService } from 'ng-mocks';6const fixture = MockService(MyService, {some: 'data'});7import { MockService } from 'ng-mocks';8const fixture = MockService(MyService, {some: 'data'});9import { MockModule } from 'ng-mocks';10const fixture = MockModule(MyModule, {some: 'data'});11import { MockModule } from 'ng-mocks';12const fixture = MockModule(MyModule, {some: 'data'});13import { MockDirective } from 'ng-mocks';14const fixture = MockDirective(MyDirective, {some: 'data'});15import { MockDirective } from 'ng-mocks';16const fixture = MockDirective(MyDirective, {some: 'data'});17import { MockPipe } from 'ng-mocks';18const fixture = MockPipe(MyPipe, {some: 'data'});19import { MockPipe } from 'ng-mocks';20const fixture = MockPipe(MyPipe, {some:

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