diff --git a/tests/unit/check_sockutil.c b/tests/unit/check_sockutil.c
new file mode 100644
index 0000000..ab55701
--- /dev/null
+++ b/tests/unit/check_sockutil.c
@@ -0,0 +1,109 @@
+#include "sockutil.h"
+
+#include <check.h>
+
+START_TEST( test_sockaddr_address_string_af_inet_converts_to_string )
+{
+	struct sockaddr sa;
+	struct sockaddr_in* v4 = (struct sockaddr_in*) &sa;
+	char testbuf[128];
+	const char* result;
+
+	v4->sin_family = AF_INET;
+	v4->sin_port = htons( 4777 );
+	ck_assert_int_eq( 1, inet_pton( AF_INET, "192.168.0.1", &v4->sin_addr ));
+
+	result = sockaddr_address_string( &sa, &testbuf[0], 128 );
+	ck_assert( result != NULL );
+
+	ck_assert_str_eq( "192.168.0.1 port 4777", testbuf );
+}
+END_TEST
+
+
+START_TEST( test_sockaddr_address_string_af_inet6_converts_to_string )
+{
+	struct sockaddr_in6 v6_raw;
+	struct sockaddr_in6* v6 = &v6_raw;
+	struct sockaddr* sa = (struct sockaddr*) &v6_raw;
+
+	char testbuf[128];
+	const char* result;
+
+	v6->sin6_family = AF_INET6;
+	v6->sin6_port = htons( 4777 );
+	ck_assert_int_eq( 1, inet_pton( AF_INET6, "fe80::1", &v6->sin6_addr ));
+
+	result = sockaddr_address_string( sa, &testbuf[0], 128 );
+	ck_assert( result != NULL );
+
+	ck_assert_str_eq( "fe80::1 port 4777", testbuf );
+}
+END_TEST
+
+/* We don't know what it is, so we just call it "???" and return NULL */
+START_TEST( test_sockaddr_address_string_af_unspec_is_failure )
+{
+	struct sockaddr sa;
+	struct sockaddr_in* v4 = (struct sockaddr_in*) &sa;
+	char testbuf[128];
+	const char* result;
+
+	v4->sin_family = AF_UNSPEC;
+	v4->sin_port = htons( 4777 );
+	ck_assert_int_eq( 1, inet_pton( AF_INET, "192.168.0.1", &v4->sin_addr ));
+
+	result = sockaddr_address_string( &sa, &testbuf[0], 128 );
+	ck_assert( result == NULL );
+
+	ck_assert_str_eq( "???", testbuf );
+}
+END_TEST
+
+/* This is a complete failure to parse, rather than a partial failure */
+START_TEST( test_sockaddr_address_string_doesnt_overflow_short_buffer )
+{
+	struct sockaddr sa;
+	struct sockaddr_in* v4 = (struct sockaddr_in*) &sa;
+	char testbuf[128];
+	const char* result;
+
+	v4->sin_family = AF_INET;
+	v4->sin_port = htons( 4777 );
+	ck_assert_int_eq( 1, inet_pton( AF_INET, "192.168.0.1", &v4->sin_addr ));
+
+	result = sockaddr_address_string( &sa, &testbuf[0], 4 );
+	ck_assert( result == NULL );
+
+	ck_assert_str_eq( "", testbuf );
+
+}
+END_TEST
+
+Suite *sockutil_suite(void)
+{
+	Suite *s = suite_create("sockutil");
+
+	TCase *tc_sockaddr_address_string = tcase_create("sockaddr_address_string");
+
+	tcase_add_test(tc_sockaddr_address_string, test_sockaddr_address_string_af_inet_converts_to_string);
+	tcase_add_test(tc_sockaddr_address_string, test_sockaddr_address_string_af_inet6_converts_to_string);
+    tcase_add_test(tc_sockaddr_address_string, test_sockaddr_address_string_af_unspec_is_failure);
+	tcase_add_test(tc_sockaddr_address_string, test_sockaddr_address_string_doesnt_overflow_short_buffer);
+	suite_add_tcase(s, tc_sockaddr_address_string);
+
+	return s;
+}
+
+int main(void)
+{
+	int number_failed;
+
+	Suite *s = sockutil_suite();
+	SRunner *sr = srunner_create(s);
+	srunner_run_all(sr, CK_NORMAL);
+	number_failed = srunner_ntests_failed(sr);
+	srunner_free(sr);
+	return (number_failed == 0) ? 0 : 1;
+}
+