tests: add test for new ietf-yang-library support

Signed-off-by: Christian Hopps <chopps@labn.net>

tests/topotests/mgmt_oper/r1/frr-yanglib.conf

@@ -0,0 +1,10 @@
+log timestamp precision 6
+log file frr.log
+
+no debug memstats-at-exit
+
+debug mgmt backend datastore frontend transaction
+
+interface r1-eth0
+  ip address 1.1.1.1/24
+exit

tests/topotests/mgmt_oper/test_yanglib.py

@@ -0,0 +1,45 @@
+#!/usr/bin/env python
+# SPDX-License-Identifier: ISC
+# -*- coding: utf-8 eval: (blacken-mode 1) -*-
+#
+# September 17 2024, Christian Hopps <chopps@labn.net>
+#
+# Copyright (c) 2024, LabN Consulting, L.L.C.
+#
+
+import json
+import pytest
+from lib.topogen import Topogen
+
+pytestmark = [pytest.mark.staticd, pytest.mark.mgmtd]
+
+
+@pytest.fixture(scope="module")
+def tgen(request):
+    "Setup/Teardown the environment and provide tgen argument to tests"
+
+    topodef = {"s1": ("r1",)}
+
+    tgen = Topogen(topodef, request.module.__name__)
+    tgen.start_topology()
+
+    router_list = tgen.routers()
+    for rname, router in router_list.items():
+        router.load_frr_config("frr-yanglib.conf")
+
+    tgen.start_router()
+    yield tgen
+    tgen.stop_topology()
+
+
+def test_yang_lib(tgen):
+    if tgen.routers_have_failure():
+        pytest.skip(tgen.errors)
+
+    r1 = tgen.gears["r1"].net
+    output = r1.cmd_nostatus(
+        "vtysh -c 'show mgmt get-data /ietf-yang-library:yang-library'"
+    )
+    ret = json.loads(output)
+    loaded_modules = ret['ietf-yang-library:yang-library']['module-set'][0]['module']
+    assert len(loaded_modules) > 10, "Modules missing from yang-library"