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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"?

IMO: Unit tests test an indivisible piece of the software under test. An integration test is any test that isn’t a unit test. e2e tests are the subset of integration tests that deal with user input to user-observable output/effect. All relative to where the boundaries of your software are.