Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/25680
This diff's adding real e2e tests for skeleton added in previous diff.
It verifies many cases for codegen, which should generate cpp code.
Reviewed By: rickhanlonii
Differential Revision: D16279810
fbshipit-source-id: 4441dd0ed4d95476e4071fbd654ebfb8a47ecbfc