Question 1

How do I integrate Differencify with Jest for visual testing?

Accepted Answer

Wrap your test steps in Jest's it() functions, and Differencify will automatically validate screenshots against snapshots. Use Jest's --updateSnapshot flag to update references, as shown in the README examples with jest integration.

Question 2

Differencify vs Percy: which is better for visual regression?

Accepted Answer

Differencify is a self-hosted, open-source tool ideal for teams using Jest and Puppeteer, offering control and no cloud costs. Percy is a cloud service with cross-browser support and managed infrastructure, better for teams needing scalability and less maintenance.

Question 3

How to mock API requests in Differencify tests?

Accepted Answer

Call the .mockRequests() method during your test chain, which uses Mockeer to intercept and mock browser requests. This isolates tests from unstable dependencies, ensuring consistent visual outputs, as detailed in the 'Mocking browser requests' section.

Question 4

Can Differencify run in Docker for CI pipelines?

Accepted Answer

Yes, it provides a Docker base image (nimasoroush/differencify) for easy setup. You can build your test environment on this image to ensure consistency across local and CI runs, as explained in the 'Interested on Docker image!' part.

Question 5

How do I update reference screenshots in Differencify?

Accepted Answer

Set the environment variable update=true when running tests, or use Jest's --updateSnapshot flag. This overwrites old reference images with new captures, similar to Jest's snapshot update workflow.

Question 6

Does Differencify support testing on different screen sizes?

Accepted Answer

Yes, use the .setViewport() method from Puppeteer's API within the chain to test various resolutions. Differencify's API allows easy integration of viewport changes for comprehensive visual regression checks.

Differencify

What is Differencify?

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