diff --git a/.gitignore b/.gitignore
index 048b48b..d7b5bba 100644
--- a/.gitignore
+++ b/.gitignore
@@ -61,6 +61,7 @@ tests/test_snprintf
 tests/test_sock
 tests/test_stanza
 tests/test_string
+tests/test_xmppaddr
 m4/
 libstrophe.project
 libs/
diff --git a/Makefile.am b/Makefile.am
index f578a10..2409cb3 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -165,6 +165,10 @@ TESTS = \
 	tests/test_stanza \
 	tests/test_resolver
 
+if !DISABLE_TLS
+TESTS += tests/test_xmppaddr
+endif
+
 check_PROGRAMS = $(TESTS)
 
 tests_check_parser_SOURCES = tests/check_parser.c tests/test.h
@@ -230,6 +234,11 @@ tests_test_stanza_CFLAGS = $(STROPHE_FLAGS)
 tests_test_stanza_LDADD = $(STROPHE_LIBS)
 tests_test_stanza_LDFLAGS = -static
 
+tests_test_xmppaddr_SOURCES = tests/test_xmppaddr.c
+tests_test_xmppaddr_CFLAGS = $(STROPHE_FLAGS) -I$(top_srcdir)/src
+tests_test_xmppaddr_LDADD = $(STROPHE_LIBS)
+tests_test_xmppaddr_LDFLAGS = -static
+
 format:
 	@echo "   * run clang-format on all sources"
 	@dos2unix -q src/*.[ch] *.h tests/*.[ch] examples/*.c
diff --git a/tests/cert.pem b/tests/cert.pem
new file mode 100644
index 0000000..6ffe4a8
--- /dev/null
+++ b/tests/cert.pem
@@ -0,0 +1,16 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
diff --git a/tests/key.pem b/tests/key.pem
new file mode 100644
index 0000000..290fff0
--- /dev/null
+++ b/tests/key.pem
@@ -0,0 +1,5 @@
+-----BEGIN EC PRIVATE KEY-----
+MF8CAQEEGF7SsbTSOjzb97nFc7Qbt4sic+1nZk+ETqAKBggqhkjOPQMBAaE0AzIA
+BI/tSR5cZ9iHCVw0JwmKLvV3TbxPg3kDdouB0R2WKEdEWwXMIHkE85RReISg+9/J
+DQ==
+-----END EC PRIVATE KEY-----
diff --git a/tests/test_xmppaddr.c b/tests/test_xmppaddr.c
new file mode 100644
index 0000000..34c774c
--- /dev/null
+++ b/tests/test_xmppaddr.c
@@ -0,0 +1,68 @@
+/* test_xmppaddr.c
+** libstrophe XMPP client library -- test routines for the xmppaddr
+** certificate API's
+**
+** Copyright (C) 2021 Steffen Jaeckel
+**
+**  This software is provided AS-IS with no warranty, either express
+**  or implied.
+**
+**  This program is dual licensed under the MIT and GPLv3 licenses.
+*/
+
+#include <assert.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "strophe.h"
+
+#include "test.h"
+
+int main()
+{
+    xmpp_ctx_t *ctx;
+    xmpp_conn_t *conn;
+    xmpp_log_t *log;
+
+    char xmppaddr_num[] = "0";
+    unsigned int n;
+
+    xmpp_initialize();
+    log = xmpp_get_default_logger(XMPP_LEVEL_DEBUG);
+    ctx = xmpp_ctx_new(NULL, log);
+    conn = xmpp_conn_new(ctx);
+
+    xmpp_conn_set_client_cert(conn, "tests/cert.pem", "tests/key.pem");
+
+    xmppaddr_num[0] = xmppaddr_num[0] + xmpp_conn_cert_xmppaddr_num(conn);
+
+    COMPARE(xmppaddr_num, "2");
+
+    for (n = 0; n < 3; ++n) {
+        char *r = xmpp_conn_cert_xmppaddr(conn, n);
+        switch (n) {
+        case 0:
+            COMPARE(r, "very.long.username@so.the.asn1.length.is.a.valid.ascii."
+                       "character");
+            break;
+        case 1:
+            COMPARE(r, "second@xmpp.jid");
+            break;
+        default:
+            if (r != NULL) {
+                printf("\nThere shall only be two id-on-xmppAddr SANs!\nFound "
+                       "another one: %s\n",
+                       r);
+                exit(1);
+            }
+            break;
+        }
+        free(r);
+    }
+
+    xmpp_conn_release(conn);
+    xmpp_ctx_free(ctx);
+    xmpp_shutdown();
+
+    return 0;
+}