interface/toplevel: Add unit tests for invalid 'feature' API usage
interface/toplevel: Add unit tests for invalid 'feature' API usage

Change-Id: Ib5fef210bf5c7dd39fea1f683e54a50500c42d5b
Reviewed-by: Scott Parlane <85029adc3fa41ef14594a57826619713bfe95f25@alliedtelesis.co.nz>
Signed-off-by: Matt Bennett <e3d8681cec70d3da741935b3385821001b249adc@alliedtelesis.co.nz>

alliedtelesis/buildsyspp,ATL-NZ/buildsyspp