To paraphrase: "Premature testing is the root of all evil". How I do it is going from rough testing of pages and components to granular testing of those parts

To paraphrase: "Premature testing is the root of all evil". How I do it is going from rough testing of pages and components to granular testing of those parts which had some error. For pages, I just run them to see if they display without producing errors, same goes for critical components. This gets me the feeling of roughly tested and from the user perspective working system with little time investment. Then I test critical business logic, but usually only after some error was reported. Mind though that I am freelance developer unconstrained by organizational rules.