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jackpope
0f81c6bf79
## Summary
Concurrent rendering has been the default since React 18 release.
ReactTestRenderer requires passing `{unstable_isConcurrent: true}` to
match this behavior, which means by default tests written with RTR use a
different rendering method than the code they test.
Eventually, RTR should only use ConcurrentRoot. As a first step, let's
add a version of the concurrent option that isn't marked unstable. Next
we will follow up with removing the unstable option when it is safe to
merge.
## How did you test this change?
`yarn test
packages/react-test-renderer/src/__tests__/ReactTestRendererAsync-test.js`
DiffTrain build for [b36ae8d7aa](https://github.com/facebook/react/commit/b36ae8d7aab94dae285d9d6a1c5f004e6fc19fc9)