How to use isSpy method in Jest

Best JavaScript code snippet using jest

logger_spec.js

Source:logger_spec.js Github

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1"use strict";2define(['lib/​component', 'lib/​debug'], function(defineComponent, debug) {3 var instance;4 var Component;5 var div = $('<div class="myDiv"></​div>').appendTo('body')[0];6 var span = $('<span class="mySpan"></​span>').appendTo('body')[0];7 describe('(Core) logger', function () {8 beforeEach(function () {9 debug.enable(true);10 debug.events.logAll();11 Component = (function () {12 return defineComponent(function() {13 this.handler = function() {};14 });15 })();16 instance = (new Component).initialize(div);17 });18 afterEach(function () {19 debug.enable(false);20 debug.events.logNone();21 Component.teardownAll();22 });23 describe('trigger logging', function () {24 it('logs trigger for default node', function () {25 spyOn(console, 'info');26 instance.trigger('click');27 expect(console.info).toHaveBeenCalledWith('->', 'trigger', '[click]', '\'div.myDiv\'', '');28 });29 it('logs trigger for custom node', function () {30 spyOn(console, 'info');31 instance.trigger('document', 'click');32 expect(console.info).toHaveBeenCalledWith('->', 'trigger', '[click]', 'document', '');33 });34 it('logs trigger with payload', function () {35 var data = {a:2};36 spyOn(console, 'info');37 instance.trigger('click', data);38 expect(console.info).toHaveBeenCalledWith('->', 'trigger', '[click]', data, '\'div.myDiv\'', '');39 });40 it('logs trigger with event object', function () {41 spyOn(console, 'info');42 instance.trigger({type:'click'});43 expect(console.info).toHaveBeenCalledWith('->', 'trigger', '[click]', '\'div.myDiv\'', '');44 });45 it('logs trigger for custom node with event object', function () {46 spyOn(console, 'info');47 instance.trigger('document', {type:'click'});48 expect(console.info).toHaveBeenCalledWith('->', 'trigger', '[click]', 'document', '');49 });50 it('logs trigger with event object and payload', function () {51 var data = {a:2};52 spyOn(console, 'info');53 instance.trigger({type:'click'}, data);54 expect(console.info).toHaveBeenCalledWith('->', 'trigger', '[click]', data, '\'div.myDiv\'', '');55 });56 it('logs trigger for custom node with event object and payload', function () {57 var data = {a:2};58 spyOn(console, 'info');59 instance.trigger('document', {type:'click'}, data);60 expect(console.info).toHaveBeenCalledWith('->', 'trigger', '[click]', data, 'document', '');61 });62 });63 describe('on logging', function () {64 it('logs on events for default node', function () {65 spyOn(console, 'info');66 instance.on('start', instance.handler);67 expect(console.info).toHaveBeenCalledWith('<-', 'on', '[start]', '\'div.myDiv\'', '');68 });69 it('logs on events for custom node', function () {70 spyOn(console, 'info');71 instance.on('body', 'start', instance.handler);72 expect(console.info).toHaveBeenCalledWith('<-', 'on', '[start]', 'body', '');73 });74 });75 describe('off logging', function () {76 it('logs off events for default node and no handler', function () {77 spyOn(console, 'info');78 instance.off('start');79 expect(console.info).toHaveBeenCalledWith('x ', 'off', '[start]', '\'div.myDiv\'', '');80 });81 it('logs off events for default node with handler', function () {82 spyOn(console, 'info');83 instance.off('start', instance.handler);84 expect(console.info).toHaveBeenCalledWith('x ', 'off', '[start]', '\'div.myDiv\'', '');85 });86 it('logs off events for custom node with handler', function () {87 spyOn(console, 'info');88 instance.off('.mySpan', 'start', instance.handler);89 expect(console.info).toHaveBeenCalledWith('x ', 'off', '[start]', '.mySpan', '');90 });91 });92 describe('log filters', function () {93 it('only logs filtered actions', function () {94 debug.events.logByAction('on', 'off');95 spyOn(console, 'info');96 instance.trigger('click');97 expect(console.info).not.toHaveBeenCalled();98 console.info.isSpy = false;99 spyOn(console, 'info');100 instance.on('click', instance.handler);101 expect(console.info).toHaveBeenCalled();102 console.info.isSpy = false;103 spyOn(console, 'info');104 instance.off('click', instance.handler);105 expect(console.info).toHaveBeenCalled();106 });107 it('only logs filtered event names', function () {108 debug.events.logByName('click', 'clack');109 spyOn(console, 'info');110 instance.trigger('click');111 expect(console.info).toHaveBeenCalled();112 console.info.isSpy = false;113 spyOn(console, 'info');114 instance.on('clack', instance.handler);115 expect(console.info).toHaveBeenCalled();116 console.info.isSpy = false;117 spyOn(console, 'info');118 instance.off('cluck', instance.handler);119 expect(console.info).not.toHaveBeenCalled();120 });121 it('only logs filtered event objects', function () {122 debug.events.logByName('click', 'clack');123 spyOn(console, 'info');124 instance.trigger({type:'click'});125 expect(console.info).toHaveBeenCalled();126 console.info.isSpy = false;127 spyOn(console, 'info');128 instance.on({type:'clack'}, instance.handler);129 expect(console.info).toHaveBeenCalled();130 console.info.isSpy = false;131 spyOn(console, 'info');132 instance.off({type:'cluck'}, instance.handler);133 expect(console.info).not.toHaveBeenCalled();134 });135 it('logs nothing when filter set to none', function () {136 debug.events.logNone();137 spyOn(console, 'info');138 instance.trigger('click');139 expect(console.info).not.toHaveBeenCalled();140 console.info.isSpy = false;141 spyOn(console, 'info');142 instance.on('click', instance.handler);143 expect(console.info).not.toHaveBeenCalled();144 console.info.isSpy = false;145 spyOn(console, 'info');146 instance.off('click', instance.handler);147 expect(console.info).not.toHaveBeenCalled();148 console.info.isSpy = false;149 spyOn(console, 'info');150 instance.trigger('click');151 expect(console.info).not.toHaveBeenCalled();152 console.info.isSpy = false;153 spyOn(console, 'info');154 instance.on('clack', instance.handler);155 expect(console.info).not.toHaveBeenCalled();156 console.info.isSpy = false;157 spyOn(console, 'info');158 instance.off('cluck', instance.handler);159 expect(console.info).not.toHaveBeenCalled();160 });161 });162 });...

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onlineLogger.js

Source:onlineLogger.js Github

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1var vk;2let lastOnline = {},3 appsName = {},4 consoleLog = true;5const authPlatform = {6 'mobile': 1,7 'iphone': 2,8 'ipad': 3,9 'android': 4,10 'wphone': 5,11 'windows': 6,12 'web': 7,13 'standalone': 8,14};15function tryLoad() {16 if(_.izCapData.loaded) {17 lastOnline = _.izCapData.get("pl:onlineLogger:lastOnline", lastOnline);18 appsName = _.izCapData.get("pl:onlineLogger:appsName", appsName);19 consoleLog = _.izCapData.get("pl:onlineLogger:consoleLog", consoleLog);20 21 _.con("User DATA Loaded [onlineLogger]", "cyan");22 }23 else24 _.izCapData.addLoad(tryLoad)25}26var rl = _.setLine((line) => {27 switch(line.trim()) {28 case 'hh':29 _.ccon("-- onlineLogger --", "red");30 _.ccon("onlinelog - set state console log online");31 break;32 case 'onlinelog':33 case 'logonline':34 _.rl.question("Console log online users status. (Current state: O"+(consoleLog? "N": "FF")+") (y/​n/​other toggle) [toggle]: ", (data) => {35 consoleLog = (data == "y" || data == "Y")? true:36 (data == "n" || data == "N")? false:37 (data == "toggle" || data=="")? !consoleLog: consoleLog;38 _.con("consoleLog state: O"+(consoleLog? "N": "FF"));39 _.izCapData.set("pl:onlineLogger:consoleLog", consoleLog).save(false, false);40 });41 break;42 }43});44module.exports = (_vk, _h) => {45 vk = _vk;46 let lp = _vk.updates;47 48 tryLoad();49 /​*50 51 Сравнимать последнее времся онлайна и оффлайна52 Вычислить тех, кто юзает "недоневидимку"53 54 ... ззх зачем это55 56 */​ 57 lp.on('user_online', async (context, next) => {58 const { userId, platformName } = context;59 let uLO = lastOnline[userId];60 if(lastOnline[userId] == undefined) {61 uLO = lastOnline[userId] = {62 timeOn: _.getTime(),63 timeOff: 0,64 status: 1, /​/​ Online65 isSpy: false,66 count: 0,67 app: 0,68 timeTGApp: 069 };70 }71 /​/​ Если app не получни последняя проверка уже кулдаун, then...72 else if(uLO.app == 0 && (_.getTime() - uLO.timeTGApp > 60)) {73 if(platformName != "standalone") {74 try {75 let user = await _.users.getFast(userId)[0];76 if(user.online_app != undefined) {77 var appName = appsName[user.online_app] || "";78 /​/​ _.con("Getted user Application Online: ["+appName+"] - "+user.online_app, "yellow")79 uLO.app = user.online_app;80 }81 } catch(e) { }82 }83 }84 if(uLO.app > 0 && appsName[uLO.app] == undefined)85 getAppName(uLO.app);86 uLO.timeOn = _.getTime();87 var lastStatus = uLO.status;88 uLO.status = authPlatform[platformName];89 _.izCapData.set("pl:onlineLogger:lastOnline", lastOnline);90 91 try {92 let user = await _.users.get(userId);93 var status = user.status,94 fullName = user.first_name+" "+user.last_name;95 var cApp = uLO.app,96 subApp = (cApp>0?(" <app ("+cApp+") "+((appsName[cApp] != undefined)?"["+appsName[cApp]+"]> ":"> ")):"");97 _.izQ.RecOnline(userId, authPlatform[platformName], false, fullName, subApp+status )98 if( !uLO.isSpy && (lastStatus != -2 || _.getTime() - uLO.timeOff > 10))99 consoleLog && _.con(fullName+" ["+userId+"] user Online "+platformName+" "+subApp, "green");100 else101 consoleLog && _.con(fullName+" ["+userId+"] user Online (SPY) "+platformName+subApp, "grey");102 } catch(e) { }103 await next();104 })105 .on('user_offline', async (context, next) => {106 const { userId, isSelfExit } = context;107 let uLO = lastOnline[userId];108 if(lastOnline[userId] == undefined) {109 uLO = lastOnline[userId] = {110 timeOn: 0,111 timeOff: _.getTime(),112 status: isSelfExit?-2:-1, /​/​ Exit | AFK113 isSpy: false,114 count: 0,115 app: 0116 };117 }118 /​/​ Если был онлайн и меньше или = 9 second, then...119 else if(isNowSpy(userId)) {120 121 if(uLO.count < 3) {122 uLO.count++;123 }124 else if(!uLO.isSpy) {125 uLO.isSpy = true;126 consoleLog && _.con("Set SPY diagnose", "yellow")127 }128 }129 else if(_.getTime() - uLO.timeOn > 360) {130 /​/​ Сброс инфы, так, на всяк случай131 if(uLO.isSpy) {132 uLO.isSpy = false;133 consoleLog && _.con("UNSet SPY diagnose...", "yellow")134 }135 uLO.count = 0;136 uLO.app = 0;137 }138 uLO.timeOff = _.getTime();139 uLO.status = isSelfExit?-2:-1;140 if(!isSelfExit && uLO.isSpy)141 uLO.isSpy = false;142 _.izCapData.set("pl:onlineLogger:lastOnline", lastOnline);143 try {144 let user = await _.users.get(userId);145 var status = user.status,146 fullName = user.first_name+" "+user.last_name;147 var zz = isSelfExit?-2:-1;148 _.izQ.RecOnline(userId, zz, false, fullName, status);149 if(!isSelfExit || (uLO.timeOn - uLO.timeOff > 9) || _.getTime() - uLO.timeOn > 15)150 consoleLog && _.con(fullName+" ["+userId+"] user Offnline "+(isSelfExit?"EXIT":"AFK"), "red");151 } catch(e) { }152 await next();153 })154};155async function getAppName(appId) {156 try {157 let data = vk.api.call('apps.get', {158 app_id: appId159 });160 data = (data.count > 0) ? data.items[0] : false;161 162 if(!data)163 return consoleLog && _.con("Error get app info", true), false;164 if(data.title != undefined) {165 if(consoleLog)166 _.con("App("+appId+") title ["+data.title+"]", "yellow");167 168 {169 appsName[appId] = data.title;170 _.izCapData.set("pl:onlineLogger:appsName", appsName);171 }172 return data.title;173 174 }175 } catch(error) { console.error(error); }176}177function isNowSpy(user) {178 var pastTense = _.getTime() - lastOnline[user].timeOn;179 return (lastOnline[user].status > 0 && pastTense <= 9);...

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PlayerIdentityReveal.component.js

Source:PlayerIdentityReveal.component.js Github

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1import React, { Component } from 'react';2import PropTypes from 'prop-types';3import {4 ActionButton,5 Text,6 PlayerCard,7 Checkbox,8 StartGameCountdown,9} from 'components';10import { View } from 'react-native';11import { createCommaSentenceFromArray } from 'helpers';12import styles from './​PlayerIdentityReveal.styles';13export default class PlayerIdentityReveal extends Component {14 static propTypes = {15 userId: PropTypes.string.isRequired,16 onConfirm: PropTypes.func.isRequired,17 isSpy: PropTypes.bool.isRequired,18 spies: PropTypes.arrayOf(19 PropTypes.shape({20 id: PropTypes.string.isRequired,21 name: PropTypes.string.isRequired,22 }),23 ).isRequired,24 };25 startingCountdown = 3;26 state = {27 countdownCount: 3,28 showingIdentity: false,29 confirmedAlone: false,30 };31 componentDidMount() {32 let iterations = 0;33 const countDown = setInterval(() => {34 this.setState(({ countdownCount }) => ({35 countdownCount: (countdownCount -= 1),36 }));37 iterations += 1;38 if (iterations >= this.startingCountdown) {39 clearInterval(countDown);40 }41 }, 1000);42 }43 showIdentity = () => {44 this.setState({45 showingIdentity: true,46 });47 };48 onConfirmAloneToggle = (confirmedAlone) => {49 this.setState({50 confirmedAlone,51 });52 };53 render() {54 const { isSpy, spies, onConfirm, userId } = this.props;55 const { showingIdentity, confirmedAlone, countdownCount } = this.state;56 const otherSpies = spies57 .filter(({ id }) => id !== userId)58 .map(({ name }) => name);59 let content = null;60 if (showingIdentity) {61 const identityText = isSpy ? `You're a spy!` : `You're an ally!`;62 let spiesText =63 isSpy &&64 `The other spies you’re working with are ${createCommaSentenceFromArray(65 otherSpies,66 )}`;67 if (otherSpies.length === 1) {68 spiesText = `${69 otherSpies[0]70 } is the other spy you are working with.`;71 }72 const spiesTextEl = spiesText && (73 <Text style={styles.spiesText}>{spiesText}</​Text>74 );75 content = (76 <View>77 <Text style={styles.title}>{identityText}</​Text>78 {spiesTextEl}79 <View style={styles.identityCard}>80 <PlayerCard isSpy={isSpy} /​>81 </​View>82 <ActionButton onPress={onConfirm}>Got It!</​ActionButton>83 </​View>84 );85 } else if (countdownCount) {86 content = <StartGameCountdown count={countdownCount} /​>;87 } else {88 content = (89 <View>90 <Text style={styles.subtitle}>91 Check the box to confirm you’re phone is hidden92 </​Text>93 <View style={styles.aloneCheckbox}>94 <Checkbox95 checked={confirmedAlone}96 label={`No players can see my phone`}97 onValueChange={this.onConfirmAloneToggle}98 /​>99 </​View>100 <ActionButton101 theme={`teal`}102 onPress={this.showIdentity}103 disabled={!confirmedAlone}104 >105 {`Reveal My Identity`}106 </​ActionButton>107 </​View>108 );109 }110 return (111 <View style={styles.container}>112 <View style={styles.innerContainer}>{content}</​View>113 </​View>114 );115 }...

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index.js

Source:index.js Github

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1import React, {useLayoutEffect} from 'react';2import {useSelector} from 'react-redux';3import styled from 'styled-components';4import {StyleSheet, Dimensions, View} from 'react-native';5import {Icon} from 'react-native-elements';6import SvgUri from 'react-native-svg-uri';7import GradientButton from '../​../​shared/​GradientButton';8const styles = StyleSheet.create({9 image: {10 justifyContent: 'center',11 position: 'absolute',12 top: 0,13 bottom: 0,14 },15 backgroundImage: {16 justifyContent: 'center',17 position: 'absolute',18 bottom: 0,19 right: '-50%',20 },21});22const Container = styled.View`23 flex: 1;24 justify-content: center;25 background-color: white;26 padding: 0 20px;27`;28const Content = styled.View`29 flex: 2;30 justify-content: center;31`;32const Card = styled.View`33 width: 100%;34 background-color: white;35 height: 100%;36 align-items: center;37 overflow: hidden;38 border-radius: 10px;39`;40const CardContainer = styled.View`41 align-self: center;42 height: 100%;43 width: 100%;44 max-width: 212px;45 max-height: 153px;46 box-shadow: 10px 10px 35px rgba(0, 0, 0, 0.2);47`;48const CardText = styled.Text`49 font-weight: bold;50 font-size: 20px;51 padding: 10px;52 margin: auto;53 color: ${({isSpy}) => (isSpy ? '#FF0000' : '#000')};54`;55const Header = styled.View`56 align-self: stretch;57 justify-content: center;58 height: 130px;59 flex: 1;60`;61const Title = styled.Text`62 font-weight: ${({isNormal}) => (isNormal ? 'normal' : 'bold')};63 color: ${({isSpy}) => (isSpy ? '#FF0000' : '#000')};64 font-size: 20px;65 line-height: 23px;66 text-align: center;67`;68const Footer = styled.View`69 flex: 1;70 align-items: center;71 justify-content: flex-start;72`;73const FooterText = styled.Text`74 margin: 0 0 21px 0;75 font-size: 16px;76 height: 18px;77`;78const windowWidth = Dimensions.get('window').width;79const RolesScreen = ({route, navigation}) => {80 const {slideId} = route.params;81 const isLastSlide = useSelector(82 (state) => state.roles.slides[state.roles.slides.length - 1].id === slideId,83 );84 const slide = useSelector((state) =>85 state.roles.slides.find((currentSlide) => currentSlide.id === slideId),86 );87 useLayoutEffect(() => {88 navigation.setOptions({89 headerLeft: () => (90 <View style={{paddingLeft: 30}}>91 <Icon92 name="close"93 label="Игра"94 onPress={() => navigation.navigate('Игра')}95 /​>96 </​View>97 ),98 });99 }, [navigation]);100 return (101 <Container>102 <Header>103 <Title isSpy={slide.isSpy} isNormal={slide.location || slide.isSpy}>104 {slide.title}105 </​Title>106 </​Header>107 <Content>108 {slide.backgroundImage && (109 <SvgUri110 style={styles.backgroundImage}111 width={windowWidth}112 source={slide.backgroundImage}113 /​>114 )}115 <CardContainer>116 <Card>117 <CardText isSpy={slide.isSpy}>{slide.location}</​CardText>118 {slide.image && (119 <SvgUri120 style={styles.image}121 width={windowWidth}122 source={slide.image}123 /​>124 )}125 </​Card>126 </​CardContainer>127 </​Content>128 <Footer>129 <FooterText>{slide.additionalText}</​FooterText>130 <GradientButton131 onPress={() => {132 isLastSlide133 ? navigation.navigate('Время')134 : navigation.navigate('Роли', {135 slideId: slideId + 1,136 });137 }}138 title={slide.buttonText}139 /​>140 </​Footer>141 </​Container>142 );143};...

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spy-all.spec.js

Source:spy-all.spec.js Github

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...8 foo () {},9 bar () {}10 }11 jasmine.spyAll(obj)12 expect(jasmine.isSpy(obj.foo)).toBeTruthy()13 expect(jasmine.isSpy(obj.bar)).toBeTruthy()14 })15 if (Object.getOwnPropertyNames) {16 it('should spy all methods with non-enumerable writable property', () => {17 const obj = new Klass()18 Object.defineProperty(obj, 'nonEnumerableProperty', {19 value: () => {},20 enumerable: false,21 writable: true22 })23 expect(obj.nonEnumerableProperty).toBeDefined()24 expect(jasmine.isSpy(obj.nonEnumerableProperty)).toBeFalsy()25 jasmine.spyAll(obj)26 expect(jasmine.isSpy(obj.nonEnumerableProperty)).toBeTruthy()27 })28 it('should not try to spy non-enumerable methods and non writable property', () => {29 const obj = new Klass()30 Object.defineProperty(obj, 'nonEnumerableProperty', {31 value: () => {},32 enumerable: false,33 writable: false34 })35 expect(obj.nonEnumerableProperty).toBeDefined()36 expect(jasmine.isSpy(obj.nonEnumerableProperty)).toBeFalsy()37 jasmine.spyAll(obj)38 expect(jasmine.isSpy(obj.nonEnumerableProperty)).toBeFalsy()39 })40 }41 it('should spy all methods except bar', () => {42 const obj = {43 foo () {},44 bar () {}45 }46 jasmine.spyAllExcept(obj, 'bar')47 expect(jasmine.isSpy(obj.foo)).toBeTruthy()48 expect(jasmine.isSpy(obj.bar)).toBeFalsy()49 })50 it('should spy all methods except foo and bar', () => {51 const obj = new Klass()52 jasmine.spyAllExcept(obj, ['foo', 'bar'])53 expect(jasmine.isSpy(obj.foo)).toBeFalsy()54 expect(jasmine.isSpy(obj.bar)).toBeFalsy()55 })56 it('should spy each methods with one argument', () => {57 const obj = {58 foo () {},59 bar () {}60 }61 jasmine.spyEach(obj, 'bar')62 expect(jasmine.isSpy(obj.foo)).toBeFalsy()63 expect(jasmine.isSpy(obj.bar)).toBeTruthy()64 })65 it('should spy each methods', () => {66 const obj = {67 foo () {},68 bar () {},69 baz () {}70 }71 jasmine.spyEach(obj, ['bar', 'foo'])72 expect(jasmine.isSpy(obj.foo)).toBeTruthy()73 expect(jasmine.isSpy(obj.bar)).toBeTruthy()74 })75 it('should not spy a method that is already a spy', () => {76 const obj = {77 foo () {},78 bar () {}79 }80 spyOn(obj, 'foo').and.returnValue(true)81 jasmine.spyAll(obj)82 expect(jasmine.isSpy(obj.foo)).toBeTruthy()83 expect(jasmine.isSpy(obj.bar)).toBeTruthy()84 })85 it('should spy class methods', () => {86 jasmine.spyAll(Klass)87 expect(jasmine.isSpy(Klass.prototype.foo)).toBeTruthy()88 expect(jasmine.isSpy(Klass.prototype.bar)).toBeTruthy()89 })90 it('should spy babel transformed instance methods', () => {91 const instance = new NonLooseClass()92 jasmine.spyAll(instance)93 expect(jasmine.isSpy(instance.methodOne)).toBeTruthy()94 expect(jasmine.isSpy(instance.methodTwo)).toBeTruthy()95 })...

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spy-all-except.spec.js

Source:spy-all-except.spec.js Github

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...8 bar () {},9 baz () {}10 }11 spyAllExcept(o, 'foo')12 expect(isSpy(o.foo)).toBe(false)13 expect(isSpy(o.bar)).toBe(true)14 expect(isSpy(o.baz)).toBe(true)15 expect(o.id).toBe(1)16 })17 it('should spy methods of object except ones', () => {18 const o = {19 id: 1,20 foo () {},21 bar () {},22 baz () {}23 }24 spyAllExcept(o, ['foo', 'bar'])25 expect(isSpy(o.foo)).toBe(false)26 expect(isSpy(o.bar)).toBe(false)27 expect(isSpy(o.baz)).toBe(true)28 expect(o.id).toBe(1)29 })30 it('should spy all if passed exceptions do not exist', () => {31 const o = {32 id: 1,33 foo () {},34 bar () {},35 baz () {}36 }37 spyAllExcept(o, 'nothing')38 expect(isSpy(o.foo)).toBe(true)39 expect(isSpy(o.bar)).toBe(true)40 expect(isSpy(o.baz)).toBe(true)41 expect(o.id).toBe(1)42 })...

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spy-each.spec.js

Source:spy-each.spec.js Github

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...7 bar () {},8 baz () {}9 }10 spyEach(o, 'foo')11 expect(jasmine.isSpy(o.foo)).toBe(true)12 expect(jasmine.isSpy(o.bar)).toBe(false)13 expect(jasmine.isSpy(o.baz)).toBe(false)14 expect(o.id).toBe(1)15 })16 it('should spy methods of object', () => {17 const o = {18 id: 1,19 foo () {},20 bar () {},21 baz () {}22 }23 spyEach(o, ['foo', 'bar'])24 expect(jasmine.isSpy(o.foo)).toBe(true)25 expect(jasmine.isSpy(o.bar)).toBe(true)26 expect(jasmine.isSpy(o.baz)).toBe(false)27 expect(o.id).toBe(1)28 })...

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PlayerCard.component.js

Source:PlayerCard.component.js Github

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1import React, { PureComponent } from 'react';2import { Image } from 'react-native';3import PropTypes from 'prop-types';4const spyCard = require(`assets/​images/​spy-card.png`);5const allyCard = require(`assets/​images/​ally-card.png`);6import styles from './​PlayerCard.styles';7export default class PlayerCard extends PureComponent {8 static propTypes = {9 isSpy: PropTypes.bool.isRequired,10 };11 static defaultProps = {12 isSpy: false,13 };14 render() {15 const { isSpy } = this.props;16 return (17 <Image source={isSpy ? spyCard : allyCard} style={styles.card} /​>18 );19 }...

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Jest Testing Tutorial

LambdaTest’s Jest Testing Tutorial covers step-by-step guides around Jest with code examples to help you be proficient with the Jest framework. The Jest tutorial has chapters to help you learn right from the basics of Jest framework to code-based tutorials around testing react apps with Jest, perform snapshot testing, import ES modules and more.

Chapters

  1. What is Jest Framework
  2. Advantages of Jest - Jest has 3,898,000 GitHub repositories, as mentioned on its official website. Learn what makes Jest special and why Jest has gained popularity among the testing and developer community.
  3. Jest Installation - All the prerequisites and set up steps needed to help you start Jest automation testing.
  4. Using Jest with NodeJS Project - Learn how to leverage Jest framework to automate testing using a NodeJS Project.
  5. Writing First Test for Jest Framework - Get started with code-based tutorial to help you write and execute your first Jest framework testing script.
  6. Jest Vocabulary - Learn the industry renowned and official jargons of the Jest framework by digging deep into the Jest vocabulary.
  7. Unit Testing with Jest - Step-by-step tutorial to help you execute unit testing with Jest framework.
  8. Jest Basics - Learn about the most pivotal and basic features which makes Jest special.
  9. Jest Parameterized Tests - Avoid code duplication and fasten automation testing with Jest using parameterized tests. Parameterization allows you to trigger the same test scenario over different test configurations by incorporating parameters.
  10. Jest Matchers - Enforce assertions better with the help of matchers. Matchers help you compare the actual output with the expected one. Here is an example to see if the object is acquired from the correct class or not. -

|<p>it('check_object_of_Car', () => {</p><p> expect(newCar()).toBeInstanceOf(Car);</p><p> });</p>| | :- |

  1. Jest Hooks: Setup and Teardown - Learn how to set up conditions which needs to be followed by the test execution and incorporate a tear down function to free resources after the execution is complete.
  2. Jest Code Coverage - Unsure there is no code left unchecked in your application. Jest gives a specific flag called --coverage to help you generate code coverage.
  3. HTML Report Generation - Learn how to create a comprehensive HTML report based on your Jest test execution.
  4. Testing React app using Jest Framework - Learn how to test your react web-application with Jest framework in this detailed Jest tutorial.
  5. Test using LambdaTest cloud Selenium Grid - Run your Jest testing script over LambdaTest cloud-based platform and leverage parallel testing to help trim down your test execution time.
  6. Snapshot Testing for React Front Ends - Capture screenshots of your react based web-application and compare them automatically for visual anomalies with the help of Jest tutorial.
  7. Bonus: Import ES modules with Jest - ES modules are also known as ECMAScript modules. Learn how to best use them by importing in your Jest testing scripts.
  8. Jest vs Mocha vs Jasmine - Learn the key differences between the most popular JavaScript-based testing frameworks i.e. Jest, Mocha, and Jasmine.
  9. Jest FAQs(Frequently Asked Questions) - Explore the most commonly asked questions around Jest framework, with their answers.

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