Hello Lucas da Costa,
Greetings from the ranch!
What testing tools are covered in your book and which tool do you find as the most useful?
Is there one tool that covers testing of the entire stack (front-end to back-end)?
Which browsers today have the best testing tools within the browser?
To test the entire stack I usually use Cypress, however, you might as well use it to test _only_ your UI. It's also useful to highlight that you can use testing tools like Jest to test both your front-end and back-end, it all depends on how you will do it, not only on the tool itself.
In regards to the browsers with the best testing tools, I particularly like Chrome's DevTools, but Firefox's are also great. I think it's a matter of personal preference.
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