e9f54512c8f6c212af6861bdf4eac45129f125b3
Adds missing tests for `CompositionAwareMixin`. Check https://github.com/flutter/engine/pull/44139#discussion_r1288733128 and https://github.com/flutter/engine/pull/44139#discussion_r1288009016 [C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style
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