diff --git a/tests/gsm0408/gsm0408_test.c b/tests/gsm0408/gsm0408_test.c
index aa6a8be..ad45507 100644
--- a/tests/gsm0408/gsm0408_test.c
+++ b/tests/gsm0408/gsm0408_test.c
@@ -172,6 +172,18 @@
 		.lac = 11,
 		.rac = 89,
 	},
+	{
+		.mcc = 0,
+		.mnc = 0,
+		.lac = 0,
+		.rac = 0,
+	},
+	{
+		.mcc = 999,
+		.mnc = 999,
+		.lac = 65535,
+		.rac = 255,
+	},
 };
 
 static void test_ra_cap(void)
diff --git a/tests/gsm0408/gsm0408_test.ok b/tests/gsm0408/gsm0408_test.ok
index a3d801d..dc19eea 100644
--- a/tests/gsm0408/gsm0408_test.ok
+++ b/tests/gsm0408/gsm0408_test.ok
@@ -12,3 +12,13 @@
 MCC+MNC in BCD: 80 f4 89 
 084-98-11-89
 RA test...passed
+Constructed RA:
+000-00-0-0
+MCC+MNC in BCD: 00 f0 00 
+000-00-0-0
+RA test...passed
+Constructed RA:
+999-999-65535-255
+MCC+MNC in BCD: 99 99 99 
+999-999-65535-255
+RA test...passed