Tests in headless mode with Cypress may fail sporadically, but consistently pass when running in a real browser

Currently, I am utilizing Cypress 9.5 to conduct tests on an Angular 13 application with a local PHP server as the backend.

Throughout the testing process, I have encountered successful results when running the tests in the browser multiple times. However, when switching to headless mode, the tests tend to fail randomly. It's worth noting that I utilize the built-in electron browser for both scenarios.

One specific issue arises during the test where I log in using the cy.request command and store necessary user data in sessionStorage. Subsequently, when attempting to visit the main page, a login dialog prompts unexpectedly.

To address this challenge, I am seeking guidance on how to effectively debug and uncover the root cause of these failures.

As a helpful hint, upon reviewing videos from the test executions, noticeable delays exist in refreshing the rendered image compared to interactions in a real browser environment.

typescriptcypress

Answer №1

Our team faced a comparable problem, and once we turned off the video, the mysterious presence disappeared.

Answer №2

Make sure to delete the line containing video:true

In older versions of Cypress (version 10 or earlier), this code should be removed from cypress.config.js or cypress.json.

When running the test in headless mode, it should execute successfully with no issues.

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