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Since e2e tests are much more expensive than unit tests - e.g., they generally take more time to run and are harder to write and maintain - you should almost always focus the majority of your testing efforts on unit tests. It’s good to follow the 80/20 rule - 80% of your tests are unit tests, while 20% are e2e tests. That said, this tutorial series breaks this rule since the goal is to educate. Keep this in mind as you write your own tests against your own application.
