We seems do not have many use cases for portrait-secondary and landscape-secondary. One thing I know to do testing with orientations is checking the default orientation in manifest.webapp in https://github.com/mozilla-b2g/gaia/blob/master/apps/calendar/manifest.webapp#L46.

So we need to ask @alivedise for that do we need the portrait-secondary and landscape-secondary states for testing System App.

@alivedise, how do you think?