RN (fiber) avoids the overhead of bridge calls if there's no update.

[bvaughn]

This is an expensive no-op for Android, and causes an unnecessary view invalidation for certain components (eg RCTTextInput) on iOS.

This was a perf regression with RN fiber. RN stack already handled this case.

[sophiebits]

Mind adding a short test? Can be as simple as this.

react/src/renderers/native/__tests__/ReactNativeMount-test.js

Line 53 in 35859df

expect(UIManager.updateView).not.toBeCalled();

Overall I like @emilsjolander's idea of doing a snapshot test too if we can figure out what is a realistic situation to capture.

[bvaughn]

Good call. I added a couple of tests for this. I didn't cover NativeMethodsMixin because we don't seem to have any createReactClass specific tests and I was on the fence about adding one. I could go either way.

[sophiebits]

tests lgtm, thanks!