Index: tests/sys/netinet/Makefile
===================================================================
--- tests/sys/netinet/Makefile
+++ tests/sys/netinet/Makefile
@@ -5,6 +5,8 @@
 TESTSDIR=	${TESTSBASE}/sys/netinet
 BINDIR=		${TESTSDIR}
 
+TESTS_SUBDIRS+=	libalias
+
 ATF_TESTS_C=	ip_reass_test \
 		so_reuseport_lb_test \
 		socket_afinet \
Index: tests/sys/netinet/libalias/1_instance.c
===================================================================
--- /dev/null
+++ tests/sys/netinet/libalias/1_instance.c
@@ -0,0 +1,95 @@
+#include <atf-c.h>
+#include <alias.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+static int randcmp(const void *a, const void *b) {
+	int res, r = rand();
+
+	(void)a;
+	(void)b;
+	res = (r/4 < RAND_MAX/9) ? 1
+	    : (r/5 < RAND_MAX/9) ? 0
+	    : -1;
+	return (res);
+}
+
+ATF_TC(2_destroynull);
+ATF_TC_HEAD(2_destroynull, env)
+{
+	atf_tc_set_md_var(env, "descr", "Destroy the NULL instance");
+}
+ATF_TC_BODY(2_destroynull, dummy)
+{
+	atf_tc_expect_death("Code expects valid pointer.");
+	LibAliasUninit(NULL);
+}
+
+ATF_TC(1_singleinit);
+ATF_TC_HEAD(1_singleinit, env)
+{
+	atf_tc_set_md_var(env, "descr", "Create an instance");
+}
+ATF_TC_BODY(1_singleinit, dummy)
+{
+	struct libalias *la;
+
+	la = LibAliasInit(NULL);
+	ATF_CHECK_MSG(la != NULL, "Creating an instance failed.");
+	LibAliasUninit(la);
+}
+
+ATF_TC(3_multiinit);
+ATF_TC_HEAD(3_multiinit, env)
+{
+	atf_tc_set_md_var(env, "descr", "Recreate an instance multiple times");
+}
+ATF_TC_BODY(3_multiinit, dummy)
+{
+	struct libalias *la;
+	int i;
+
+	la = LibAliasInit(NULL);
+	for(i = 1; i < 30; i++) {
+		struct libalias *lo = la;
+
+		la = LibAliasInit(la);
+		ATF_CHECK_MSG(la == lo, "Recreating moved the instance around: %d", i);
+	}
+	LibAliasUninit(la);
+}
+
+ATF_TC(4_multiinstance);
+ATF_TC_HEAD(4_multiinstance, env)
+{
+	atf_tc_set_md_var(env, "descr", "Create and destoy multiple instances.");
+}
+ATF_TC_BODY(4_multiinstance, dummy)
+{
+	struct libalias *la[300];
+	int const num_instances = sizeof(la) / sizeof(*la);
+	int i;
+
+	for (i = 0; i < num_instances; i++) {
+		la[i] = LibAliasInit(NULL);
+		ATF_CHECK_MSG(la[i] != NULL, "Creating instance %d failed.", i);
+	}
+
+	qsort(la, num_instances, sizeof(*la), randcmp);
+
+	for (i = 0; i < num_instances; i++)
+		LibAliasUninit(la[i]);
+}
+
+ATF_TP_ADD_TCS(instance)
+{
+	/* Use "dd if=/dev/random bs=2 count=1 | od -x" to reproduce */
+	srand(0x5ac4);
+
+	ATF_TP_ADD_TC(instance, 2_destroynull);
+	ATF_TP_ADD_TC(instance, 1_singleinit);
+	ATF_TP_ADD_TC(instance, 3_multiinit);
+	ATF_TP_ADD_TC(instance, 4_multiinstance);
+
+	return atf_no_error();
+}
Index: tests/sys/netinet/libalias/Makefile
===================================================================
--- /dev/null
+++ tests/sys/netinet/libalias/Makefile
@@ -0,0 +1,29 @@
+# $FreeBSD$
+
+.include <bsd.own.mk>
+
+PACKAGE=	tests
+
+TESTSDIR=	${TESTSBASE}/sys/netinet/libalias
+BINDIR=		${TESTSDIR}
+
+ATF_TESTS_C+=	1_instance
+
+LIBADD+=	alias
+
+.include <bsd.test.mk>
+
+#
+# Tesing during development
+#
+# - call "make install" once to generate the Kyuafile in $(.OBJDIR)
+# - call "make test" to run the freshly build tests without installation
+#
+test:	$(ATF_TESTS_C)
+	cd ${.OBJDIR}; kyua test
+
+report:
+	cd ${.OBJDIR}; kyua report
+
+report-v:
+	cd ${.OBJDIR}; kyua report --verbose