add test FEATURE test_hello for capability advertisement

tests/CMakeLists.txt

@@ -42,7 +42,7 @@ set(TEST_SRC "${CMAKE_CURRENT_SOURCE_DIR}/np2_test.c" "${CMAKE_CURRENT_SOURCE_DI
 
 # list of all the tests
 set(TESTS test_rpc test_edit test_filter test_subscribe_filter test_subscribe_param test_parallel_sessions
-    test_candidate test_with_defaults test_nacm test_sub_ntf test_sub_ntf_advanced test_sub_ntf_filter test_error test_other_client)
+    test_candidate test_with_defaults test_nacm test_sub_ntf test_sub_ntf_advanced test_sub_ntf_filter test_error test_other_client test_hello)
 
 if(CMAKE_C_FLAGS MATCHES "-fsanitize=thread")
     message(WARNING "Features which use SIGEV_THREAD are known to be broken under TSAN, disabling tests for YANG-push and confirmed commit")

tests/test_hello.c

@@ -0,0 +1,104 @@
+/**
+ * @file test_hello.c
+ * @author Vincent Jardin
+ * @brief test NETCONF hello capability advertisement
+ *
+ * @copyright
+ * Copyright (c) 2026 Free Mobile, Vincent Jardin.
+ *
+ * This source code is licensed under BSD 3-Clause License (the "License").
+ * You may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://opensource.org/licenses/BSD-3-Clause
+ */
+
+#define _GNU_SOURCE
+
+#include <setjmp.h>
+#include <stdarg.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <cmocka.h>
+#include <libyang/libyang.h>
+#include <nc_client.h>
+
+#include "np2_test.h"
+#include "np2_test_config.h"
+
+static int
+local_setup(void **state)
+{
+    char test_name[256];
+    const char *modules[] = {
+        NP_TEST_MODULE_DIR "/edit1.yang",   /* YANG 1.0 */
+        NP_TEST_MODULE_DIR "/notif2.yang",  /* YANG 1.1 */
+        NULL
+    };
+    int rc;
+
+    np2_glob_test_setup_test_name(test_name);
+
+    rc = np2_glob_test_setup_env(test_name);
+    assert_int_equal(rc, 0);
+
+    rc = np2_glob_test_setup_server(state, test_name, modules, NULL, 0);
+    assert_int_equal(rc, 0);
+
+    return 0;
+}
+
+static int
+local_teardown(void **state)
+{
+    const char *modules[] = {"edit1", "notif2", NULL};
+
+    if (*state) {
+        return np2_glob_test_teardown(state, modules);
+    }
+
+    return 0;
+}
+
+static void
+test_yang10_in_hello(void **state)
+{
+    struct np2_test *st = *state;
+    const char *cpblt;
+
+    /* YANG 1.0 modules must be advertised in hello capabilities (RFC 6241) */
+    cpblt = nc_session_cpblt(st->nc_sess, "urn:ed1?module=edit1");
+    assert_non_null(cpblt);
+}
+
+static void
+test_yang11_not_in_hello(void **state)
+{
+    struct np2_test *st = *state;
+    const char *cpblt;
+
+    /* YANG 1.1 modules must NOT be in hello capabilities per RFC 7950 section 1.1:
+     * "A server advertises support for YANG 1.1 modules by using ietf-yang-library
+     *  instead of listing them as capabilities in the <hello> message."
+     * Clients should discover YANG 1.1 modules via ietf-yang-library. */
+    cpblt = nc_session_cpblt(st->nc_sess, "urn:n2?module=notif2");
+    assert_null(cpblt);
+}
+
+int
+main(int argc, char **argv)
+{
+    const struct CMUnitTest tests[] = {
+        cmocka_unit_test(test_yang10_in_hello),
+        cmocka_unit_test(test_yang11_not_in_hello),
+    };
+
+    if (argc > 1) {
+        parse_arg(argc, argv);
+    }
+
+    return cmocka_run_group_tests(tests, local_setup, local_teardown);
+}