In commit "libweston: add struct weston_drm_format" we've added an API
to store and manage DRM formats and modifiers. As it has a couple of set
operations that are not so obvious, this adds unit tests to ensure
correctness. In the future we may expand this API and also improve
performance, so it is important to have this.
Signed-off-by: Leandro Ribeiro <leandro.ribeiro@collabora.com>
