There are many cases in which you may need your tests to act on behalf of an authenticated user. For instance, if your Web application provides special functionality for authorized users, you will need your test to authenticate.
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An Easier Way to Authenticate Users in E2E Tests
There are many cases in which you may need your tests to act on behalf of an authenticated user. For instance, if your Web application provides special functionality for authorized users, you will need your test to authenticate.
Full article