Commits on Oct 20, 2022

1. Support use in act testing API …

   `use` can avoid suspending on already resolved data by yielding to
   microtasks. In a real, browser environment, we do this by scheduling
   a platform task (i.e. postTask).
   
   In a test environment, tasks are scheduled on a special internal queue
   so that they can be flushed by the `act` testing API. So we need to add
   support for this in `act`.
   
   This behavior only works if you `await` the thenable returning by
   `act` call. We currently do not require that users do this. So I added
   a warning, but it only fires if `use` was called. The old Suspense
   pattern will not trigger a warning. This is to avoid breaking existing
   tests that use Suspense.
   
   The implementation of `act` has gotten extremely complicated because of
   the subtle changes in behavior over the years, and our commitment to
   maintaining backwards compatibility. We really should consider being
   more restrictive in a future major release.
   
   The changes are a bit confusing so I did my best to add inline comments
   explaining how it works.

   

   acdlite committed Oct 20, 2022
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