tests: add test for northbound ordering fix

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

tests/topotests/nb_config/r1/frr.conf

@@ -0,0 +1,6 @@
+log timestamp precision 6
+log file frr.log
+
+interface r1-eth0
+  ip address 1.1.1.1/24
+exit

tests/topotests/nb_config/test_nb_config.py

@@ -0,0 +1,69 @@
+# -*- coding: utf-8 eval: (blacken-mode 1) -*-
+# SPDX-License-Identifier: ISC
+#
+# February 24 2024, Christian Hopps <chopps@labn.net>
+#
+# Copyright (c) 2024, LabN Consulting, L.L.C.
+#
+"""
+Test Northbound Config Operations
+"""
+import json
+import os
+
+import pytest
+from lib.topogen import Topogen
+from lib.topotest import json_cmp
+
+pytestmark = [pytest.mark.mgmtd]
+
+CWD = os.path.dirname(os.path.realpath(__file__))
+
+
+@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.conf")
+
+    tgen.start_router()
+    yield tgen
+    tgen.stop_topology()
+
+
+def test_access_list_config_ordering(tgen):
+    if tgen.routers_have_failure():
+        pytest.skip(tgen.errors)
+
+    r1 = tgen.gears["r1"]
+
+    output = r1.vtysh_multicmd([
+        "conf t",
+        "access-list test seq 1 permit host 10.0.0.1"])
+    output = r1.vtysh_cmd("show ip access-list test json")
+    got = json.loads(output)
+    expected = json.loads('{"ZEBRA":{"test":{"type":"Standard", "addressFamily":"IPv4", "rules":[{"sequenceNumber":1, "filterType":"permit", "address":"10.0.0.1", "mask":"0.0.0.0"}]}}}')
+    result = json_cmp(got, expected)
+    assert result is None
+
+    #
+    # If the northbound mis-orders the create/delete then this test fails.
+    # https://github.com/FRRouting/frr/pull/15423/commits/38b85e0c2bc555b8827dbd2cb6515b6febf548b4
+    #
+    output = r1.vtysh_multicmd([
+        "conf t",
+        "access-list test seq 1 permit 10.0.0.0/8"])
+    output = r1.vtysh_cmd("show ip access-list test json")
+    got = json.loads(output)
+    expected = json.loads('{"ZEBRA":{"test":{"type":"Zebra", "addressFamily":"IPv4", "rules":[{"sequenceNumber":1, "filterType":"permit", "prefix":"10.0.0.0/8", "exact-match":false}]}}}')
+    result = json_cmp(got, expected)
+    assert result is None