This is a smoke test for the fuchsia.intl.PropertyProvider protocol implementer (usually intl). It also relies on setui_service and that component's implementation of fuchsia.settings.Intl.
This test modifies the user's internationalization preferences but attempts to restore the original values after it runs.
fx set core.x64 --with //sdk/ctf/tests/fidl/fuchsia.intl:tests # ... fx fuchsia.intl.test-services-system-test