add test for gsm48_ra_id_by_bts()

Change-Id: I7bd55126848ed2c246d64cf672e1e6772da64be7
diff --git a/tests/gsm0408/gsm0408_test.ok b/tests/gsm0408/gsm0408_test.ok
index b85141a..686018b 100644
--- a/tests/gsm0408/gsm0408_test.ok
+++ b/tests/gsm0408/gsm0408_test.ok
@@ -214,4 +214,11 @@
 SI5: 06 1d 10 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
 SI5bis: 06 05 10 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
 SI5ter: 06 06 10 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
+test_gsm48_ra_id_by_bts[0]: digits='00f120' lac=0x0300=htons(3) rac=0x04=4 pass
+test_gsm48_ra_id_by_bts[1]: digits='00f120' lac=0x0300=htons(3) rac=0x04=4 pass
+test_gsm48_ra_id_by_bts[2]: digits='00f000' lac=0x0000=htons(0) rac=0x00=0 pass
+test_gsm48_ra_id_by_bts[3]: digits='00f000' lac=0x0000=htons(0) rac=0x00=0 pass
+test_gsm48_ra_id_by_bts[4]: digits='999999' lac=0xffff=htons(65535) rac=0xff=255 pass
+test_gsm48_ra_id_by_bts[5]: digits='09f909' lac=0xcdab=htons(43981) rac=0xab=171 pass
+test_gsm48_ra_id_by_bts[6]: digits='09f909' lac=0xcdab=htons(43981) rac=0xab=171 pass
 Done.