gsm: Introduce API osmo_gsm48_rest_octets_si13_decode

Related: SYS#5358
Change-Id: I74fb0a3afc1ac4aadbfc609b882d929401f790eb
diff --git a/tests/testsuite.at b/tests/testsuite.at
index d715a3e..d2a10dd 100644
--- a/tests/testsuite.at
+++ b/tests/testsuite.at
@@ -156,6 +156,12 @@
 AT_CHECK([$abs_top_builddir/tests/gsm0408/gsm0408_test], [0], [expout], [ignore])
 AT_CLEANUP
 
+AT_SETUP([gsm48_rest_octets])
+AT_KEYWORDS([gsm48_rest_octets])
+cat $abs_srcdir/gsm48/rest_octets_test.ok > expout
+AT_CHECK([$abs_top_builddir/tests/gsm48/rest_octets_test], [0], [expout], [ignore])
+AT_CLEANUP
+
 AT_SETUP([gprs])
 AT_KEYWORDS([gprs])
 cat $abs_srcdir/gprs/gprs_test.ok > expout