[test] Intended behavior for not committing a partial tree in a Transition #33040
+35
−0
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Summary
We already have a similar assertion in https://github.com/eps1lon/react/blob/abc59fac23619b5c0354e8472d47dd0726c1cd09/packages/react-reconciler/src/__tests__/ReactTransition-test.js#L789-L790. That test does a lot more so I extracted the important bits that trip up React DevTools.