Cypress [2021] Download Event

We have an application that polls the server periodically until a task is completed. We fire a global event so that Cypress can catch and find out if the task is finished but we had trouble using document.addEventListener on Cypress. Here's what we're doing:

The reason why your code isn't working like you expect is because in Cypress, your tests run in a separate frame than your application under test (AUT). The event you're waiting for will never fire inside of Cypress's document.

Cypress Download Event

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To make Cypress wait for your event before continuing, you can just wrap it in a Cypress.Promise. The Cypress docs have an example about waiting for a Promise to complete. For your queryEnd event, it would look something like this:

There are a myriad of other events Cypress fires to communicate with the Nodeserver process, automation servers, mocha, the application, and the reporter.They are strictly internal to the way Cypress works and not useful for users.

The cy object is bound to each individual test. Events bound to cy willautomatically be removed when the test ends. You don't have to worry aboutcleanup, and your event listeners will only be called for the duration of thesingle test.

Error: Uncaught AssertionError: expected '$f is not defined\n\nThis error originated from your application code, not from Cypress. \n\nWhen Cypress detects uncaught errors originating from your application it will automatically fail the current test.\n\nThis behavior is configurable, and you can choose to turn this off by listening to the \'uncaught:exception\' event.\n\n -exception-from-application' to include 'of undefined' ( _cypress/runner/cypress_runner.js:49186)

Often the web application uses events that flow from one part of the application to another. You might need to observe these events from the end-to-end tests to confirm the application sends them. This blog post shows how to receive the custom DOM events and jQuery events. In every case, it is important to set up the listener before the application sends the event.

We are getting the document object using cy.document just to call its method addEventListener. We can invoke the method right away using the .invoke command. We can also confirm the details in the event object.

In the tests above we still might have a race condition; we call the cy.document()... addEventListener after the cy.visit command. By that time, the application might have fired the event already. The safest way to listen to the event sent at the application's startup is to register them before the application loads. We cannot simply move addEventListener before cy.visit

What if the application is sending custom jQuery events? You can receive these events but you have to be careful: you must use the same jQuery instance that sends them. From the test, you must get the reference to the jQuery instance running inside the application, not the jQuery instance bundled with Cypress under Cypress.$ property.

Let's confirm the application triggers events like lights:toggle. We will get the jQuery from the application's window object, then we can get the document, wrap it in the jQuery object, and register a stub.

After wrapping my reducer in the ReduxEmitter and reloading the application in Chrome with Kuker DevTools extension installed I see events from the Redux store. For example, if I add 2 items and toggle the second item, the extension shows the following:

Great, I can see the Redux events, see the details for a particular event, and I can go back in time to inspect the store after any event - this all is super convenient while working with the application locally or in production. But what about our tests? Can we observe the same events from our end-to-end tests and make assertions against them?

I would like to confirm the action and state objects passed inside the message - we know their expected values. But there is a problem: there are unpredictable timestamps in the event object, which makes the exact object comparison very difficult. I could sanitize the Kuker messages using JSON Schemas, but for now we can just extract the desired properties and keep using cy.spy. Here is how to do it.

When clicking on the "REDUX" command in the Test Runner Command Log, the DevTools console shows the properties of the sanitized object. Note the message "The snapshot is missing" - it is shown because I did not invoke Cypress.log(...).snapshot(). The DOM snapshot would be incorrect in our case - the UI has not been refreshed yet when the Redux event was sent, thus I find the snapshot more confusing than helpful.

As the objects keep growing, the tests become harder to read. We can move the expected values into fixture files and keep them away from the test code. For example, here is cypress/fixtures/first-event.json file:

I will emit the events from the actions methods, I just need to call the function kuker returned by the BaseEmitter() factory method. There are multiple properties the Kuker DevTools can receive that control what is displayed for each event. We can send the state, any action data, an optional background color and even a Font Awesome icon name that better describes what the web application is doing.

It is up to me, the web application developer, to decide if and how to use the events emitted by the application in my end-to-end tests. I personally prefer to keep my tests independent from the implementation, and in this case would simply confirm that the emitted list of events matches the expected list in some key properties: the label and the updated state. Using the spy mechanism described above, we can remember the events we see in each test:

We are checking the list of received events using cypress-plugin-snapshots which makes reviewing and accepting test snapshots changes a breeze. In our current test, the very first events list has been saved as a JS file and will be compared with the value produced on each run. As long as the web application emits the same events, the test will stay green.

End-to-end tests can verify the web application behavior through the user interface alone. Or they can listen to the events emitted by the app to verify the underlying model updates - and the tests can achieve this without major code changes or testing the app's internals. Of course, every application is different, and you - the developer - should make the call how the test should proceed. Cypress just gives you the power to pick the most effective path to well tested software.

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