Commits on Mar 28, 2018

1. Add unstable APIs for async rendering to test renderer …

   These are based on the ReactNoop renderer, which we use to test React
   itself. This gives library authors (Relay, Apollo, Redux, et al.) a way
   to test their components for async compatibility.
   
   - Pass `unstable_isAsync` to `TestRenderer.create` to create an async
   renderer instance. This causes updates to be lazily flushed.
   - `renderer.unstable_yield` tells React to yield execution after the
   currently rendering component.
   - `renderer.unstable_flushAll` flushes all pending async work, and
   returns an array of yielded values.
   - `renderer.unstable_flushThrough` receives an array of expected values,
   begins rendering, and stops once those values have been yielded. It
   returns the array of values that are actually yielded. The user should
   assert that they are equal.
   
   Although we've used this pattern successfully in our own tests, I'm not
   sure if these are the final APIs we'll make public.

   

   acdlite committed Mar 28, 2018
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