Index: lib/libbsnmp/Makefile
===================================================================
--- lib/libbsnmp/Makefile
+++ lib/libbsnmp/Makefile
@@ -1,5 +1,6 @@
 # $FreeBSD$
 
 SUBDIR=	libbsnmp
+SUBDIR.${MK_TESTS}+= tests
 
 .include <bsd.subdir.mk>
Index: lib/libbsnmp/tests/Makefile
===================================================================
--- /dev/null
+++ lib/libbsnmp/tests/Makefile
@@ -0,0 +1,11 @@
+# $FreeBSD$
+
+.include <bsd.own.mk>
+
+ATF_TESTS_C+=	bsnmpd_test
+
+SRCS.bsmpd_test=	bsnmpd_test.c
+
+LIBADD+=	bsnmp
+
+.include <bsd.test.mk>
Index: lib/libbsnmp/tests/bsnmpd_test.c
===================================================================
--- /dev/null
+++ lib/libbsnmp/tests/bsnmpd_test.c
@@ -0,0 +1,25 @@
+#include <bsnmp/asn1.h>
+
+#include <atf-c.h>
+
+ATF_TC_WITHOUT_HEAD(sa_19_20_bsnmp_test);
+ATF_TC_BODY(sa_19_20_bsnmp_test, tc)
+{
+	struct asn_buf b = {};
+	char test_buf[] = { 0x25, 0x7f };
+	enum asn_err err;
+	asn_len_t len;
+	u_char type;
+
+	b.asn_cptr = test_buf;
+	b.asn_len = sizeof(test_buf);
+
+	err = asn_get_header(&b, &type, &len);
+	ATF_CHECK_EQ(ASN_ERR_EOBUF, err);
+}
+
+ATF_TP_ADD_TCS(tp)
+{
+	ATF_TP_ADD_TC(tp, sa_19_20_bsnmp_test);
+	return (atf_no_error());
+}