test: add coverage for zero-length style values #35027
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Ensures that empty string style values (e.g., { color: '' }) are skipped
during serialization, matching browser behavior and preventing hydration
mismatches.
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This PR adds a new test case to verify that style properties with empty string values (e.g.,
{ color: '' })are correctly skipped during style serialization. This behavior prevents React from rendering invalid CSS likestyle="color:"and avoids potential hydration mismatches between server and client.https://github.com/facebook/react/blob/main/packages/react-dom-bindings/src/client/CSSPropertyOperations.js#L35
this line seems to be doing all the heavy lifting here, we already have
undefined&nulltest added and this PR adds theno zero-length styles, which completes the test coverage.cc @rickhanlonii @eps1lon