ASP.NET Core 3 and React

End-to-end tests

End-to-end tests verify that key paths work together as expected. No parts of the app are isolated and mocked away. These tests run a fully functioning app just like a user would and so it gives us the maximum amount of confidence that our app is functioning correctly.

These tests are slow to execute, though, which can delay the feedback loop during development; they're also the most expensive to write and maintain. This is because everything that the tests rely on, such as the data in the database, needs to be consistent each time the tests are executed, which is a challenge when we implement multiple tests that have different data requirements.