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Their docs are surprisingly good: https://docs.cypress.io/guides/references/best-practices

Ooh, I had skimmed the docs but hadn’t seen the best practices section, thanks!

I’ve had a horrible time testing an app using a web socket backend. Cypress tests take forever to run, fail randomly due to race conditions, and websocket responses are annoying to mock.

I liked https://testingjavascript.com/ from Kent.C.Dodds a lot. It has a separate chapter on Cypress testing. Not sure if it qualifies as advanced, since he also start from scratch. But Kent always has fast-paced videos, so you won't be skipping lots of sections...