Cypress workshop for JSFoo 2019

Apr 19, 2019Download as PPTX, PDF0 likes121 views

Cypress is a tool that allows writing automated tests in JavaScript to test frontend applications. It runs tests directly in the browser to avoid issues with end-to-end tests like flakiness and long setup times. Cypress taps into native browser APIs and uses a network proxy to control requests and avoid same-origin policy issues. It provides real-time DOM access, asynchronous commands, automatic retries, and the ability to stub network requests. While not fully open source and limited to JavaScript, Cypress aims to solve problems with traditional end-to-end testing.

Write automation tests in your
favourite language, javascript
Shabareesh JL
Biswajit Pattanayak

What is wrong with e2e tests?
● Developers hate e2e tests
● E2E tests are flaky
● E2E tests take long time to set up
● Limited debuggability
● Network traffic control

How it works and capabilities
● Runs in browser and in the same run loop as the application
● Taps the native browser apis and network proxy to modify the requests
so as to avoid same-origin policy
● Realtime native access to the DOM
● Cypress commands are promise alike and are asynchronous in nature
● During execution all commands are enqueued in a global singleton object
● Automatic retry ability
● Can stub or spy network requests; hence useful to simulate failure
conditions

Limitations
● Not completely open source; runs on a freemium model
● Supports only javascripts; no other language support possible
● Bound to same-origin policy
● Cross browser support is still being worked on
● Can’t run a multi tab test
● Remote execution is not possible
● If the app contains 3rd party iFrames, cypress can test those by disabling
web security or through cy.request
● Performing tasks outside the browser are little cumbersome

How we exploited it to solve our problem

Hands-on Exercise
❖ write a simple cypress test to validate a user journey
❖ understand debugging, reporting in cypress
❖ make the test suite CI ready - setting up environment configuration,
choosing browser, and recording tests
❖ stubbing in cypress to test edge cases
❖ use other important features of cypress such as making XHR request,
using plugin, writing custom commands

This document introduces Cypress, an end-to-end testing framework for web applications. It discusses why Cypress is useful for testing, how to get started by installing Cypress and writing test scripts, and provides tips for selecting elements and handling dynamic content. Key aspects covered include planning test cases, writing tests for common pages like login and article creation, and using the Cypress testing library to write robust tests.

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Cypress workshop for JSFoo 2019

1. Write automation tests in your favourite language, javascript Shabareesh JL Biswajit Pattanayak

2. What is wrong with e2e tests? ● Developers hate e2e tests ● E2E tests are flaky ● E2E tests take long time to set up ● Limited debuggability ● Network traffic control

3. How cypress can solve this?

4. How it works and capabilities ● Runs in browser and in the same run loop as the application ● Taps the native browser apis and network proxy to modify the requests so as to avoid same-origin policy ● Realtime native access to the DOM ● Cypress commands are promise alike and are asynchronous in nature ● During execution all commands are enqueued in a global singleton object ● Automatic retry ability ● Can stub or spy network requests; hence useful to simulate failure conditions

5. Limitations ● Not completely open source; runs on a freemium model ● Supports only javascripts; no other language support possible ● Bound to same-origin policy ● Cross browser support is still being worked on ● Can’t run a multi tab test ● Remote execution is not possible ● If the app contains 3rd party iFrames, cypress can test those by disabling web security or through cy.request ● Performing tasks outside the browser are little cumbersome

6. How we exploited it to solve our problem

7. Hands-on Exercise ❖ write a simple cypress test to validate a user journey ❖ understand debugging, reporting in cypress ❖ make the test suite CI ready - setting up environment configuration, choosing browser, and recording tests ❖ stubbing in cypress to test edge cases ❖ use other important features of cypress such as making XHR request, using plugin, writing custom commands

Cypress workshop for JSFoo 2019

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