Cypress is open-source but it is not based on open standards like WebDriver. When we evaluated Cypress for internal use – there were a few show-stoppers for us. Clicking in Cypress works like Selenium 1 (the predecessor to Selenium WebDriver) and dispatches DOM Events Directly. Ask a question and find answers in the Cypress Developer Community Forums. Low/intermittent bandwidth users tip: Firefox and Chrome browsers will allow downloads to be resumed if your connection is lost during download.
Back to Cypress blogWe recently open-sourced the Cypress Real World App (RWA) project on GitHub. The RWA is an example payment application for demonstrating real-world usage of Cypress testing methods, patterns, practices, and workflows.
You can use this app to learn, experiment, tinker, and practice application testing with Cypress. We consistently heard from our community that users needed a fully-formed, realistic, and relatable demonstrations of Cypress in practice. Users desired guidance beyond ad-hoc recipes and simple demo apps to leverage the capabilities of Cypress fully.
Motivated by the community feedback, we set out to build an application that was sufficiently-complex yet approachable. We aimed to accomplish and demonstrate the following:
- Easy & Quick Setup. There are no additional dependencies to install. The RWA uses lowDB, a JS-based JSON database, so no need to fuss with a database setup. Just clone, install and run.
- 100% Code Coverage. The app is instrumented for code coverage-reporting and achieves full coverage for backend and frontend code purely with E2E tests.
- Responsive Testing. All test suites run in desktop and mobile viewports in CI. To check out testing in mobile viewports, just run
yarn cypress:open:mobile
. - Cross-browser Testing. All test suites are tested in Chrome and Firefox in CI.
- Cypress-specific Practices. We demonstrate practices that are unique to or made easy with Cypress, such as tapping into the state of your app, programmatic authentication, advanced custom commands, and more techniques to help you compose efficient tests.
- Database Seeding. Test data generation and database reseeding during testing. We also demonstrate how to compose E2E tests by directly querying the database for fetching test data or to make assertions.
- CI Best Practices. The RWA is tested on every pushed commit with a CI configuration that is readable and powerful. It handles parallelization, multi-viewport jobs, cross-browser jobs, and code-coverage reporting. You can view all the CI runs within the Cypress Dashboard.
The current state of the RWA is simply a starting point, and it serves as a foundation for the development of various prescriptive and in-depth guides:
- Test Organization & Approach: Effective test writing, test organization, scalable patterns, and best practices.
- Data Initialization: Methodologies for initializing data at the database and application layer for testing.
- Authentication: Practices for testing various authentication methods.
- and more specialized guides.
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We hope you find this project useful for learning testing and Cypress. We've got more in store, and value your feedback. Get started with the RWA today:
- Clone:
git clone https://github.com/cypress-io/cypress-realworld-app.git
- Install:
yarn install
- Start the app:
yarn start
- Start testing:
yarn cypress:open
Happy Testing!
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Cypress Firefox Extension
Back to Cypress blogIf you are a Node.js developer, installing Cypress as a dev dependency in your
package.json
file or even via direct download seems simple enough. Yet for developers working in other languages like Python or Go, using npm can be an obstacle. We often hear this question from developers:Why don’t you have a Docker image with Cypress pre-installed?
Having an image with both OS dependencies and the Cypress test runner ready to go seems to be very convenient, which is well described in this blog post “End-to-End Testing Web Apps: The Painless Way” by Michael Lynch.
We have listened and created a Docker image with Cypress installed. It is called
cypress/included
and is tagged with the version of Cypress installed in the image. For now, we'll use the image for the current Cypress version as of this writing - the cypress/included:3.2.0
image. We create new images for every Cypress version released. The image is built on top of the cypress/base:12.1.0
image with Node 12.1.0 included. You can find our official Docker images in the cypress-docker-images repository and on Docker hub.You can find the examples below in the repo demo-docker-cypress-included.
Running headless tests
If you have Cypress end-to-end tests, you can run them using the complete image. For example, if your project structure looks like this:
Then you can execute your Cypress tests using the following shell command:
Nothing to install, just write your spec files using your favorite editor and run them.
Commands and options
The image
cypress/included:3.2.0
has the entrypoint set to cypress run
, so you don’t need to type it when running our Docker image. If you want a different command, you can change the entrypoint and then pass any additional arguments after the image name.You can also pass environment variables into the container to control Cypress behavior. For example, the boolean config option
video
controls if the video of the run is recorded. It is true
by default, but you can disable it via an environment variable.If you want to record the test run on the Cypress Dashboard to review later, you need to pass the record key and the
--record
CLI flag.Container info
![Firefox Firefox](https://i.ebayimg.com/images/i/401272880189-0-1/s-l1000.jpg)
To show the information about the operating system and pre-installed browsers, you can execute cypress info command:
We can see both Chrome and Firefox browsers pre-installed in the
cypress/included:6.2.1
image. Let's run our tests using Firefox browser for example:Interactive mode
Cypress Firefox Cors
Running the tests inside a Docker container is nice, but it is missing my favorite Cypress feature: its interactive Test Runner with the Command Log, time-traveling debugger and live view of what is going on during the test! Typically, you would execute
cypress open
to open the Test Runner in interactive mode, but how do we see it if Cypress opens inside a Docker container?On your iPhone, go into Settings Mail, Contacts, Calendars, select Add Account. And add Google as Exchange (!!!) account. Using Google as Exchange account allows you to sync calendars and contacts. See http://www.google.com/support/mobile/bin/answer.py?answer=138740&topic=14252. Sync Google Contacts with your mobile device or computer Open your iPhone or iPad's Settings app. Tap Accounts & Passwords Add Account Google. Enter your email and password. Switch 'Contacts' on. At the top, tap Save. ![Access Access](/uploads/1/3/7/6/137683862/870965000.png)
![Access Access](/uploads/1/3/7/6/137683862/870965000.png)
If you want to see Cypress in interactive mode, you need to forward the XVFB messages from Cypress out of the Docker container into an X11 server running on the host machine. I have done this on my Mac; other operating systems might require different commands.
PulseAudio — a sound server that provides a number of features on top of the low-level audio interface ALSAon Linux. Gentoo Packages Database. © 2001–2020 Gentoo Foundation, Inc. Gentoo is a trademark of the Gentoo Foundation, Inc.
I have installed an XQuartz X11 server following the instructions at Running GUI applications using Docker for Mac.
Then I grabbed the IP of the host machine and added it to the allowed X11 hosts.
Now you can execute a
cypress open
command passing DISPLAY
and the X11 socket file to the container:The Docker container starts and you can see the full interactive Cypress Test Runner open. You can watch the test run, interact with the Command Log, open DevTools, etc. Even spec file watching is working - if you edit and save the
cypress/integration/spec.js
file, the Test Runner picks up the change and reruns the tests.Debugging tip: if Cypress shows an error
Gtk-WARNING **: cannot open display:..
make sure X11 server allows connections over the network from the Docker container. Run xhost
command in the terminal to see if it has the IP address you have added previous with xhost + $IP
. Docker compose
Using docker-compose to spawn services and run end-to-end tests is very convenient. We have coded several examples that show how to run a web application and Cypress tests in two Docker containers:
- cypress-open-from-docker-compose which is a fork of mtlynch/hello-world-cypress
To support both
cypress run
and cypress open
settings we recommend:- placing the default settings for
cypress run
intodocker-compose.yml
file, for example, like this
You can start the application, run the headless tests and close the services with command:
- place the X11 configuration that enables
cypress open
Test Runner to show on the host machine in a separate YAML file that extends the above file. The second file only has additional environment variables and volumes
To start in the interactive mode we need to pass both filenames to the docker
You should see the Test Runner and be able to run tests
Testing site on host
Let's consider another common situation: running the Test Runner inside a Docker container, while running the website on the host outside the container. First, start the website on the host machine
Now start the Test Runner but instead of
localhost
use a special Docker domain that points back at the host machine:Running the Test Runner in a Docker container allows us to debug font and encoding issues. For example the problem of missing Chinese characters in the
cypress-documentation
translation is only visible on CI or inside a Docker container.Cypress Firefox Web Security
More information
- Official cypress-docker-images
- cypress-open-from-docker-compose example
If you have any feedback for this approach or suggestions on how to make running Cypress even simpler for your team, please let us know. Open an issue in the cypress-io/cypress-docker-images repo or in the main cypress-io/cypress repo (and do not forget to give it a ⭐️!)
Bonus
If you want to run Cypress Test Runner inside a Docker container, while the web application is running on the host machine, read how to do this in 'Run Cypress included from Docker container'
Bonus 2
You can use
cypress/included
Docker image to run tests without installing any dependencies on GH Actions CI. See repository cypress-gh-action-included and its workflow file: © 2021 Cypress.io •Privacy •Terms of Use