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Settle an argument: what is an integration test, and is that the same as an end-to-end test? Secondly, is testing a React component a "unit test"?

To me, unit tests only require one system under test. So a react component test can be a unit test if that’s a basic building block in your software. But if you’re testing something that operates at the framework level, that could even be e2e.

Integration tests are just how two or more parts of my system get tested. When I write a test against a MobX-State-Tree store and then checks its impact on a React component, that’s an integration test to me.