Preparation for SnapshotTesting support

Changes description

I added some tests to prevent inadvertent regressions, which will provide additional code coverage data.

Capture d’écran 2023-05-03 à 17 08 22

This force me to raise the Showcase minimum version to iOS 13.

I'm trying to have more control over the codebase. To ensure safer acceptance of PRs, I prefer having a minimum amount of tests.

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