tests: Add a very simple test for the dplane_fpm_nl module

Ensure that the fpm module connects to the specified listener
and then ensure that 10k routes from sharpd are installed
into the system and then are removed.

Signed-off-by: Donald Sharp <sharpd@nvidia.com>

tests/topotests/fpm_testing_topo1/r1/fpm_counters.json

@@ -0,0 +1,8 @@
+{
+  "connected":true,
+  "useNHG":true,
+  "useRouteReplace":true,
+  "disabled":false,
+  "address":"127.0.0.1",
+  "port":2620
+}

tests/topotests/fpm_testing_topo1/r1/routes_summ.json

@@ -0,0 +1,27 @@
+{
+  "routes":[
+    {
+      "fib":1,
+      "rib":1,
+      "fibOffLoaded":0,
+      "fibTrapped":0,
+      "type":"connected"
+    },
+    {
+      "fib":1,
+      "rib":1,
+      "fibOffLoaded":0,
+      "fibTrapped":0,
+      "type":"local"
+    },
+    {
+      "fib":10000,
+      "rib":10000,
+      "fibOffLoaded":0,
+      "fibTrapped":0,
+      "type":"sharp"
+    }
+  ],
+  "routesTotal":10002,
+  "routesTotalFib":10002
+}

tests/topotests/fpm_testing_topo1/r1/routes_summ_removed.json

@@ -0,0 +1,20 @@
+{
+  "routes":[
+    {
+      "fib":1,
+      "rib":1,
+      "fibOffLoaded":0,
+      "fibTrapped":0,
+      "type":"connected"
+    },
+    {
+      "fib":1,
+      "rib":1,
+      "fibOffLoaded":0,
+      "fibTrapped":0,
+      "type":"local"
+    }
+  ],
+  "routesTotal":2,
+  "routesTotalFib":2
+}

tests/topotests/fpm_testing_topo1/r1/zebra.conf

@@ -0,0 +1,5 @@
+fpm address 127.0.0.1
+
+interface r1-eth0
+  ip address 192.168.44.1/24
+!

tests/topotests/fpm_testing_topo1/test_fpm_topo1.py

@@ -0,0 +1,134 @@
+#!/usr/bin/env python
+# SPDX-License-Identifier: ISC
+
+#
+# test_route_scale1.py
+#
+# Copyright (c) 2024 by
+# Nvidia, Inc.
+# Donald Sharp
+#
+
+"""
+test_fpm_topo1.py: Testing FPM module
+
+"""
+import os
+import re
+import sys
+import pytest
+import json
+from functools import partial
+
+# Save the Current Working Directory to find configuration files.
+CWD = os.path.dirname(os.path.realpath(__file__))
+sys.path.append(os.path.join(CWD, "../"))
+
+# pylint: disable=C0413
+# Import topogen and topotest helpers
+from lib import topotest
+from lib.topogen import Topogen, TopoRouter, get_topogen
+from lib.topolog import logger
+
+
+pytestmark = [pytest.mark.sharpd]
+
+
+def build_topo(tgen):
+    "Build function"
+
+    # Populate routers
+    tgen.add_router("r1")
+
+    switch = tgen.add_switch("sw1")
+    switch.add_link(tgen.gears["r1"])
+
+
+def setup_module(module):
+    "Setup topology"
+
+    # fpm_stub = os.system("which fpm-stub")
+    # if fpm-stub:
+    #    pytest.skip("")
+
+    tgen = Topogen(build_topo, module.__name__)
+    tgen.start_topology()
+
+    router_list = tgen.routers()
+    for rname, router in router_list.items():
+        router.load_config(
+            TopoRouter.RD_ZEBRA,
+            os.path.join(CWD, "{}/zebra.conf".format(rname)),
+            "-M dplane_fpm_nl",
+        )
+        router.load_config(
+            TopoRouter.RD_SHARP, os.path.join(CWD, "{}/sharpd.conf".format(rname))
+        )
+        router.load_config(
+            TopoRouter.RD_FPM_STUB, os.path.join(CWD, "{}/fpm_stub.conf".format(rname))
+        )
+
+    tgen.start_router()
+
+
+def teardown_module(_mod):
+    "Teardown the pytest environment"
+
+    tgen = get_topogen()
+
+    # This function tears down the whole topology.
+    tgen.stop_topology()
+
+
+def test_fpm_connection_made():
+    "Test that the fpm starts up and a connection is made"
+
+    tgen = get_topogen()
+    router = tgen.gears["r1"]
+
+    fpm_counters = "{}/r1/fpm_counters.json".format(CWD)
+    expected = json.loads(open(fpm_counters).read())
+
+    test_func = partial(
+        topotest.router_json_cmp, router, "show fpm status json", expected
+    )
+
+    success, result = topotest.run_and_expect(test_func, None, 30, 1)
+    assert success, "Unable to connect to the fpm:\n{}".format(result)
+
+
+def test_fpm_install_routes():
+    "Test that simple routes installed appears to work"
+
+    tgen = get_topogen()
+    router = tgen.gears["r1"]
+
+    # Let's install 10000 routes
+    router.vtysh_cmd("sharp install routes 10.0.0.0 nexthop 192.168.44.33 10000")
+    routes_file = "{}/r1/routes_summ.json".format(CWD)
+    expected = json.loads(open(routes_file).read())
+
+    test_func = partial(
+        topotest.router_json_cmp, router, "show ip route summ json", expected
+    )
+
+    success, result = topotest.run_and_expect(test_func, None, 60, 1)
+    assert success, "Unable to successfully install 10000 routes: {}".format(result)
+
+    # Let's remove 10000 routes
+    router.vtysh_cmd("sharp remove routes 10.0.0.0 10000")
+
+    routes_file_removed = "{}/r1/routes_summ_removed.json".format(CWD)
+    expected = json.loads(open(routes_file_removed).read())
+
+    test_func = partial(
+        topotest.router_json_cmp, router, "show ip route summ json", expected
+    )
+
+    success, result = topotest.run_and_expect(test_func, None, 60, 1)
+    assert success, "Unable to remove 10000 routes: {}".format(result)
+
+
+if __name__ == "__main__":
+    args = ["-s"] + sys.argv[1:]
+    sys.exit(pytest.main(args))