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How to use devServer.start method in Cypress

Best JavaScript code snippet using cypress

Gruntfile.js

Source:Gruntfile.js

1'use strict';2module.exports = function (grunt) {3  grunt.initConfig({4    pkg: grunt.file.readJSON('package.json'),5    startserver: {6    	options: {7    		configJson: grunt.file.readJSON('www/commonapp/config.json')8    	}9    }10  });11  //Developer tasks12  grunt.registerTask('devserver', 'Start dev server for speedy refresh of web resources', function () {13  	  	grunt.util.spawn({14      	cmd: 'node',15      	args: ['./dev_server/app.js']16   		 },grunt.task.current.async());  17  });18  19  grunt.registerTask('chrome','Start Chrome with web security disabled',function(){20  	 grunt.util.spawn({21  	  	cmd : 'bash',22  	  	args: ['./build/start-chrome.sh']23  	  },grunt.task.current.async());24  });25  26  grunt.registerTask('stage', 'git add files before running the release task', function () {27	    var files = this.options().files;28	    grunt.util.spawn({29	      cmd: process.platform === 'win32' ? 'git.cmd' : 'git',30	      args: ['add'].concat(files)31	    }, grunt.task.current.async());32  });33  34  //Admin tasks35  grunt.registerTask('setup-worklight', ['createWLDB','buildWAR','deployWAR']);36  grunt.registerTask('build-app', ['copyFiles','buildwlapp']);37  grunt.registerTask('deploy-app', ['deploywlapp']);38  grunt.registerTask('build-adapters', ['buildAdapters']);39  grunt.registerTask('deploy-adapters', ['deployAdapters']);40  41  42  43  //Private tasks below44  grunt.registerTask('copyFiles','Build optimized Dojo and copy those files to Worklight app',function(){45  	 grunt.util.spawn({46  	  	cmd : 'ant',47  	  	args: ['copyFiles','-f','./build/build.xml']48  	  },grunt.task.current.async());49  });50  51  grunt.registerTask('buildwlapp','Build Worklight app .wlapp file',function(){52  	 grunt.util.spawn({53  	  	cmd : 'ant',54  	  	args: ['buildwlapp','-f','./build/build.xml']55  	  },grunt.task.current.async());56  });57  58  grunt.registerTask('deploywlapp','Deploy Worklight app .wlapp file',function(){59	  	 grunt.util.spawn({60	  	  	cmd : 'ant',61	  	  	args: ['deploywlapp','-f','./build/build.xml']62	  	  },grunt.task.current.async());63	  });64  65  grunt.registerTask('buildAdapters','Build Worklight adapters',function(){66	  	 grunt.util.spawn({67	  	  	cmd : 'ant',68	  	  	args: ['buildAdapters','-f','./build/build.xml']69	  	  },grunt.task.current.async());70	  });71  72  grunt.registerTask('deployAdapters','Deploy Worklight adapters',function(){73	  	 grunt.util.spawn({74	  	  	cmd : 'ant',75	  	  	args: ['deployAdapters','-f','./build/build.xml']76	  	  },grunt.task.current.async());77	  });78  79  grunt.registerTask('buildWAR','Build Worklight WAR',function(){80	  	 grunt.util.spawn({81	  	  	cmd : 'ant',82	  	  	args: ['buildWAR','-f','./build/build.xml']83	  	  },grunt.task.current.async());84	  });85  86  grunt.registerTask('deployWAR','Deploy Worklight WAR',function(){87	  	 grunt.util.spawn({88	  	  	cmd : 'ant',89	  	  	args: ['deployWAR','-f','./build/build.xml']90	  	  },grunt.task.current.async());91	  });92  93  grunt.registerTask('createWLDB','Create WL DB',function(){94	  	 grunt.util.spawn({95	  	  	cmd : 'ant',96	  	  	args: ['createWLDB','-f','./build/build.xml']97	  	  },grunt.task.current.async());98	  });99  100  grunt.registerTask('makeDocs','Create API docs',function(){101	  	 grunt.util.spawn({102	  	  	cmd : 'ant',103	  	  	args: ['generateAPIDocs','-f','./build/build.xml']104	  	  },grunt.task.current.async());105	  });...

webpackDevserver.js

Source:webpackDevserver.js

1'use strict'2console.log('[webpackDevserver info]: Starting script...')3const4	argv = require('yargs').argv,5	co = require('co'),6	getWebpackConfig = require(`./config/webpack/${argv.webpackConfigType}`),7	merge = require('deepmerge'),8	path = require('path'),9	webpack = require('webpack'),10	WebpackDevServer = require('webpack-dev-server')1112const13	listenPromise = (moduleName, moduleConfig, webpackConfig) => new Promise((resolve, reject) => {14		new WebpackDevServer(webpack(webpackConfig), {15			publicPath: webpackConfig.output.publicPath,16			// hot: true,17			historyApiFallback: true,18			stats: {19				colors: true20			}21		}).listen(moduleConfig.webpackDevserverPort, moduleConfig.hostName, function (err) {22			if (err) {23				console.log(`[${moduleName}]`, err)24				reject(err)25				return26			}27			console.log(`[${moduleName}] Listening at ${moduleConfig.webpackHost}`)28			resolve()29		})30	})3132console.log('[webpackDevserver info]: Modules loaded. Loading config...')33let config = merge(require('./config/common'), require(`./config/profiles/${argv.configProfile || 'local'}`)),34	startForClientModules = argv.startForClientModules || ''3536co(function*() {37	console.log('[webpackDevserver info]: Config loaded, build starting...')38	startForClientModules = startForClientModules.split(',')39	for (const moduleName in config.clients) {40		let moduleConfig = config.clients[moduleName]41		if (!moduleConfig.startWebpackDevserver && (startForClientModules.indexOf(moduleName) === -1)) {42			continue43		}4445		moduleConfig.clientPath = path.join(config.clientModulesPublicSourcesPath, moduleName)46		moduleConfig.publicPath = path.join(config.clientModulesPublicPath, moduleName)47		moduleConfig.nodeModulesPath = path.join(__dirname, 'node_modules')48		moduleConfig.mode = 'development'49		let webpackConfig = getWebpackConfig(moduleConfig)50		if (!webpackConfig.plugins) {51			webpackConfig.plugins = []52		}53		webpackConfig.plugins = webpackConfig.plugins.concat(webpackConfig[`${config.name}Plugins`] || [])54		for (const key in webpackConfig) {55			if (key.indexOf('Plugins') !== -1) {56				delete webpackConfig[key]57			}58		}59	60		webpackConfig.entry.unshift('webpack-dev-server/client?' + moduleConfig.webpackHost)61		webpackConfig.output.publicPath = moduleConfig.webpackHost + webpackConfig.output.publicPath62	63		yield listenPromise(moduleName, moduleConfig, webpackConfig)64	}65	return true
...

test-browser.js

Source:test-browser.js

1#!/usr/bin/env node2var path = require('path');3var spawn = require('child_process').spawn;4var webdriverjs = require('webdriverjs');5var devserver = require('./dev-server.js');6var SELENIUM_PATH = '../node_modules/.bin/start-selenium';7var testUrl = 'http://127.0.0.1:8000/tests/test.html';8var testTimeout = 2 * 60 * 1000;9var testSelector = 'body.testsComplete';10var currentTest = '';11var results = {};12var client = {};13var browsers = [14  'firefox',15  // Temporarily disable safari until it is fixed (#1068)16  // 'safari',17  'chrome'18];19// Travis only has firefox20if (process.env.TRAVIS) {21  browsers = ['firefox'];22}23function startServers(callback) {24  // Starts the file and CORS proxy25  devserver.start();26  // Start selenium27  var selenium = spawn(path.resolve(__dirname, SELENIUM_PATH));28  selenium.stdout.on('data', function(data) {29    if (/Started org.openqa.jetty.jetty/.test(data)) {30      callback();31    }32  });33}34function testsComplete() {35  var passed = Object.keys(results).every(function(x) {36    return results[x].passed;37  });38  if (passed) {39    console.log('Woot, tests passed');40    process.exit(0);41  } else {42    console.error('Doh, tests failed');43    process.exit(1);44  }45}46function resultCollected(err, result) {47  console.log('[' + currentTest + '] ' +48              (result.value.passed ? 'passed' : 'failed'));49  results[currentTest] = result.value;50  client.end(startTest);51}52function testComplete(err, result) {53  if (err) {54    console.log('[' + currentTest + '] failed');55    results[currentTest] = {passed: false};56    return client.end(startTest);57  }58  client.execute('return window.testReport;', [], resultCollected);59}60function startTest() {61  if (!browsers.length) {62    return testsComplete();63  }64  currentTest = browsers.pop();65  console.log('[' + currentTest + '] starting');66  client = webdriverjs.remote({67    logLevel: 'silent',68    desiredCapabilities: {69      browserName: currentTest70    }71  });72  client.init();73  client.url(testUrl).waitFor(testSelector, testTimeout, testComplete);74}75startServers(function() {76  startTest();...

tasks.js

Source:tasks.js

1import gulp from 'gulp';2import browserSync from 'browser-sync';3function startServer() {4    let staticServer = browserSync.create();5    staticServer.init({6        port: 3000,7        ui: false,8        ghostMode: false,9        open: false,10        single: true,11        server: {12            baseDir: 'dist'13        }14    });15    return staticServer;16}17function startDevServer() {18    let staticServer = startServer();19    gulp.watch('dist/**/*', staticServer.reload);20}21gulp.task('server', startServer);22gulp.task('devserver', startDevServer);23export { startServer };...

Using AI Code Generation

1const { startDevServer } = require('@cypress/webpack-dev-server')2const webpackConfig = require('@cypress/webpack-preprocessor')3const nextConfig = require('../next.config')4module.exports = (on, config) => {5  on('dev-server:start', (options) => {6    return startDevServer({7      webpackConfig: webpackConfig({ webpackOptions: nextConfig }),8    })9  })10}

Using AI Code Generation

1import { devServer } from '@cypress/webpack-dev-server'2devServer.start({3  options: {4    webpackOptions: {5    },6  },7})

Cypress Tutorial

Cypress is a renowned Javascript-based open-source, easy-to-use end-to-end testing framework primarily used for testing web applications. Cypress is a relatively new player in the automation testing space and has been gaining much traction lately, as evidenced by the number of Forks (2.7K) and Stars (42.1K) for the project. LambdaTest’s Cypress Tutorial covers step-by-step guides that will help you learn from the basics till you run automation tests on LambdaTest.

Chapters:

What is Cypress? -
Why Cypress? - Learn why Cypress might be a good choice for testing your web applications.
Features of Cypress Testing - Learn about features that make Cypress a powerful and flexible tool for testing web applications.
Cypress Drawbacks - Although Cypress has many strengths, it has a few limitations that you should be aware of.
Cypress Architecture - Learn more about Cypress architecture and how it is designed to be run directly in the browser, i.e., it does not have any additional servers.
Browsers Supported by Cypress - Cypress is built on top of the Electron browser, supporting all modern web browsers. Learn browsers that support Cypress.
Selenium vs Cypress: A Detailed Comparison - Compare and explore some key differences in terms of their design and features.
Cypress Learning: Best Practices - Take a deep dive into some of the best practices you should use to avoid anti-patterns in your automation tests.
How To Run Cypress Tests on LambdaTest? - Set up a LambdaTest account, and now you are all set to learn how to run Cypress tests.

Certification

You can elevate your expertise with end-to-end testing using the Cypress automation framework and stay one step ahead in your career by earning a Cypress certification. Check out our Cypress 101 Certification.