I don't think the point is to isolate all state. In the SiloUtilizationPage, I would assume that the hard part is getting the result of the two useApiQuery call

I don't think the point is to isolate all state. In the SiloUtilizationPage, I would assume that the hard part is getting the result of the two useApiQuery calls. The other state could be set up by clicking around or in a `play()` function. Since you're using ReactQuery, you can just create a separate QueryClient for testing, call `setQueryData` on it, and then pass it in through a context. That way you could render this component without any changes to it.