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> unit test anything but the individual pieces

Isn't that the definition of a unit test?

Debatable but I get your point. The thing is that Flux is a pattern, and you often want to test the full pattern to get a meaningful "unit" of behavior/logic. There can be meaningful logic in the individual pieces, but frequently they only make sense as a whole.

It's not debatable...

Unit tests are for testing individual components of your application (web or otherwise)

e2e or integration tests are for testing your application component/lib/api/whatever boundaries

Sure, but what do you count as a "component"? It varies by language, framework, platform, and pattern.

How do you test individual components in isolation if they depend on the global state store?

That's a code smell. 99% of components in a project should rely on props.

How does that play with Redux Hooks for example? https://react-redux.js.org/next/api/hooks

If you are using hooks in your components, you need the global store instance. To call this unit testing is too big a stretch for me.

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