Companies need to test any delivery method they intent to get marketing approval for. If a drug is approved for oral ingestion (pill or liquid), they need to test it that way. If approved and brought to market, that’s how it should be used. If someone is silly (or stubborn) enough to use it any other way (lets say, snort a crushed pill), that is not the company’s responsibility (though they probably will get some flack for it….) For some medication where alternative intake is a concern, companies may alter the formulation, for instance add a substance to the pill that makes it impossible to crush fine enough to snort, or make a liquid for ingestion very viscous so it can’t be injected.