Mixins: @Shadow method from superclass example

@Mixin(LivingEntity.class)
public abstract class LivingEntityMixin{
    @Shadow public abstract boolean hasStatusEffect(StatusEffect effect);
    @Shadow public abstract StatusEffectInstance getStatusEffect(StatusEffect effect);
}

@Mixin(ClientPlayerEntity.class)
public abstract class ClientPlayerEntityMixin extends LivingEntityMixin{

    @Inject(method = "updateNausea()V", at = @At(value = "TAIL"))
    private void injection(CallbackInfo ci){
        if (this.hasStatusEffect(StatusEffects.NAUSEA) && this.getStatusEffect(StatusEffects.NAUSEA).getDuration() > 60) {
            // do something
        }
    }
}