Cypress: The future of E2E testing

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: The future of E2E testing @elmd_ NG-BE

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BIG Gleb Bahmutov BIG

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HOW DO YOU TEST YOUR FRONTEND?

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Integration Unit E2E

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ARE YOUR E2E TESTS SLOW?

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FLAKY or UNRELIABLE?

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HARD TO MAINTAIN?

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OR HARD TO WRITE?

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Unit

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Unit Static Types Linters

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IGNORE TESTING COMPLETELY?

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WELCOME TO THE CLUB

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WHAT TO EXPECT • What is it that makes Cypress so outstanding and reliable? • Getting started with Cypress • Write some basic tests and learn how to work with HTTP requests and the local storage • Explore debugging capabilities • ( Conﬁgure Cypress for Continuous Integration )

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Blogging blog.thoughtram.io Dominic Elm Trainer @thoughtram @elmd_ = ABOUT MYSELF

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https:!//angular-checklist.io/projects Angular Checklist

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What is ? Fast, easy and reliable testing for anything that runs in a browser. Free. Open Source. MIT Licence.

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Setting up Cypress $ npm install cypress !--save-dev All-in-one solution that uses a good set of testing libraries Mocha Chai Sinon …

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Running Cypress $ $(npm bin)/cypress open $ $(npm bin)/cypress run !--record Local CI Alternatively you can also use for npm > v5.2 ℹ npx

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LET’S TRY!

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HOW IS CYPRESS DIFFERENT FROM SELENIUM?

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Selenium vs. Cypress (1) Selenium Cypress Conﬁguration Browser Support Open Source Architecture Remote commands across the network Runs inside the browser and uses Node for anything outside of the browser

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Selenium’s Architecture Ruby C# Java PHP JS Other Bindings (Client) Chrome Safari IE FF Edge Other WebDriver (Server) BROWSER JSON «controls» via HTTP via HTTP

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Cypress’s Architecture Browser Cypress via Websocket Node.js Process OS Proxy HTTP Request(s) WEB HTTP Response(s) start with proxy http://localhost:63115/__/#/tests/__all iFrame localhost Cypress (Tests) iFrame Application localhost DOM Service Worker … LocalStorage Window

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Selenium vs. Cypress (1) Selenium Cypress Debuggability Speed Waiting for Elements Parallelism ⏳ ⏳ Headless Browser ⏳ Multiple Browsers / Tabs Soon free for OSS

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Selenium vs. Cypress (1) Selenium Cypress Debuggability Speed Waiting for Elements Parallelism ⏳ ⏳ Headless Browser ⏳ Multiple Browsers / Tabs Soon free for OSS

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LET’S CODE!

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What I ❤ about Cypress • Super intuitive and easy to use • No ﬂaky tests (waits for XHR requests and DOM elements) • Rich UI and lots of debugging capabilities (screenshots and videos) • One step install (all in one solution) • Open source • Documentation

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Inspirations • todomvc, https://github.com/d3lm/todomvc • ngx-drag-to-select, https://github.com/d3lm/ngx-drag-to-select • MachineLabs, https://github.com/machinelabs/machinelabs

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@elmd_

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References • Images from https://www.pexels.com/ and https://unsplash.com/ • cypress.io • Cypress vs. Selenium, is it the end of an era? - Lyudmil Latinov • Next Generation Web Application End to End Testing - Amir Rustamzadeh • Painless Testing for React Applications - Gleb Bahmutov • End-to-end Testing Is Hard - But It Doesn't Have to Be - Gleb Bahmutov