Summary:
I was looking at the coverage report of the JavaScript code in the `Libraries` folder, and found some of the modules and functions to be (partially) untested. I believe that adding tests to them would formally capture their behaviour and avoid future regressions. In this PR, I've added some unit tests for 3 utility components.
Perhaps a more general question: Are these kinds of PRs appreciated? I'd be interested in submitting more of them in the future.
Not applicable, since it only adds tests.
Pull Request resolved: https://github.com/facebook/react-native/pull/23903
Differential Revision: D14477601
Pulled By: cpojer
fbshipit-source-id: c0700c5b514cd0df983fecfd91c93fc2bd049f5d
47e061549f