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Authenticated E2E

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Honestly, end to end testing would be pretty simple if we didn't have to think about user authentication. However, most apps we build have aspects of it that require a specific user (and normally the most important parts of our app do), so we do need to think about user authentication in our tests.
A pretty naΓ―ve way to do this is to simply make a utility out of our onboarding test and run that before every test that needs to have an authenticated user. However, this leads to two problems:
  1. Tests take however long onboarding takes + however long the test itself takes.
  2. A failure in onboarding will cause all tests that depend on it to fail which can make debugging failures a bit more difficult.
We already know that onboarding is working (provided the onboarding test passes), so it's just unnecessary work to run it before every test. Instead, thanks to the fact that our tests are running in a node.js environment and we have access to all our application code, we can actually skip the onboarding process and just create a user directly in the database. Then all we need to do is simulate the same authentication process that we do in our app.
In most apps, this involves setting a cookie in the playwright page. You'll use Playwright's addCookies API for this. πŸ“œ Learn more about cookies.
This is not exactly a "mock," but if you squint, it kinda could be. We're just doing steps in our test that are impossible for users to do. And that would be really bad if we didn't already verify that the user can do those steps manually as well.
Because doing this is so common, we normally make a utility to do it for us.
In Playwright, you can definitely call functions in your test code. But there's also a feature called "fixtures" (I know, it's a bit of an overloaded term) that allows you to make utility functions that hook into the test. We'll be using that capability to make our utility easy to use. πŸ“œ Learn more about fixtures.

Two Factor Auth

When it comes to supporting two factor auth you may worry that you need to somehow integrate with a 2FA service in order to generate codes. However, we already have code we can reuse from our app to generate codes, provided we have the verification secret. Which we can get from the application when setting up 2FA or by asking the database for it directly.
Once you have that, then you simply pass along the options to generateTOTP from @epic-web/totp and poof, you get an otp you can use for 2FA.