Fix concatenation of accessibility labels in automated tests on iOS #24113
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Aug 25, 2020
I came across this because one of my customer's apps was freezing the UI and crashing after spending ~10 seconds when trying to read the accessibilityLabel of a view with a "particularly complex and dynamic view hierarchy". I'm still not entirely sure what the app was doing, but I believe this will sidestep the issue entirely. I believe this change will also improve both the accessibility and the testability of RN apps, in addition to fixing that crash. This PR supersedes or fixes facebook#21830, facebook#25963, facebook#24113, facebook#24118, appium/appium#10654, possibly facebook#25220, and probably a few other tickets I haven't identified. Also worth mentioning that there is very similar code in https://github.com/facebook/react-native/blob/master/React/Fabric/Mounting/ComponentViews/View/RCTViewComponentView.mm#L489-L515 - I haven't dug into that as much, but I suspect it should probably get the same treatment. If anyone wants, I can include it in this PR.
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Summary
When using Appium in order to provide automated tests a unique accessibility label has to be specified for a single element in order to be identified in the Appium inspector tool. However, on iOS, the accessibility label for a single element contained the labels of all the elements on the screen concatenated into one string.
I have provided a fix that would stop concatenating the accessibility labels of other elements from the screen.
Changelog
[IOS][Changed] - Fix concatenation of accessibilityLabels for an element
Test Plan
Before the fix, the accessibility labels were showing like this in the Appium inspector.
https://ibb.co/Nxq4Cdh
I have run the following tests in order to make sure that the current modifications are working and that the old functionality is still working.