fix(thoth): minor testing fixups, ensure ASNChecker is Checker

Signed-off-by: Xe Iaso <me@xeiaso.net>

internal/thoth/asnchecker_test.go

@@ -5,16 +5,19 @@ import (
 	"net/http/httptest"
 	"testing"
 
+	"github.com/TecharoHQ/anubis/lib/policy"
 	iptoasnv1 "github.com/TecharoHQ/thoth-proto/gen/techaro/thoth/iptoasn/v1"
 )
 
+var _ policy.Checker = &ASNChecker{}
+
 func TestASNChecker(t *testing.T) {
 	cli := loadSecrets(t)
 
 	asnc := &ASNChecker{
 		iptoasn: cli.iptoasn,
 		asns: map[int]struct{}{
-			13335: struct{}{},
+			13335: {},
 		},
 		hash: "foobar",
 	}