tests: Check if peer-group is working in topotests

Signed-off-by: Donatas Abraitis <donatas.abraitis@gmail.com>

tests/topotests/bgp_peer-group/r1/bgpd.conf

@@ -0,0 +1,8 @@
+!
+router bgp 65001
+  neighbor PG peer-group
+  neighbor PG remote-as external
+  neighbor PG timers 3 10
+  neighbor 192.168.255.3 peer-group PG
+  neighbor r1-eth0 interface peer-group PG
+!

tests/topotests/bgp_peer-group/r1/zebra.conf

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+!
+interface r1-eth0
+ ip address 192.168.255.1/24
+!
+ip forwarding
+!

tests/topotests/bgp_peer-group/r2/bgpd.conf

@@ -0,0 +1,7 @@
+!
+router bgp 65002
+  neighbor PG peer-group
+  neighbor PG remote-as external
+  neighbor PG timers 3 10
+  neighbor r2-eth0 interface peer-group PG
+!

tests/topotests/bgp_peer-group/r2/zebra.conf

@@ -0,0 +1,6 @@
+!
+interface r2-eth0
+ ip address 192.168.255.2/24
+!
+ip forwarding
+!

tests/topotests/bgp_peer-group/r3/bgpd.conf

@@ -0,0 +1,7 @@
+!
+router bgp 65003
+  neighbor PG peer-group
+  neighbor PG remote-as external
+  neighbor PG timers 3 10
+  neighbor 192.168.255.1 peer-group PG
+!

tests/topotests/bgp_peer-group/r3/zebra.conf

@@ -0,0 +1,6 @@
+!
+interface r3-eth0
+ ip address 192.168.255.3/24
+!
+ip forwarding
+!

tests/topotests/bgp_peer-group/test_bgp_peer-group.py

@@ -0,0 +1,99 @@
+#!/usr/bin/env python
+
+#
+# Copyright (c) 2021 by
+# Donatas Abraitis <donatas.abraitis@gmail.com>
+#
+# Permission to use, copy, modify, and/or distribute this software
+# for any purpose with or without fee is hereby granted, provided
+# that the above copyright notice and this permission notice appear
+# in all copies.
+#
+# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
+# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
+# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
+# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
+# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+# OF THIS SOFTWARE.
+#
+
+"""
+Test if peer-group works for numbered and unnumbered configurations.
+"""
+
+import os
+import sys
+import json
+import pytest
+import functools
+
+CWD = os.path.dirname(os.path.realpath(__file__))
+sys.path.append(os.path.join(CWD, "../"))
+
+# pylint: disable=C0413
+from lib import topotest
+from lib.topogen import Topogen, TopoRouter, get_topogen
+from lib.topolog import logger
+from mininet.topo import Topo
+
+
+class TemplateTopo(Topo):
+    def build(self, *_args, **_opts):
+        tgen = get_topogen(self)
+
+        for routern in range(1, 4):
+            tgen.add_router("r{}".format(routern))
+
+        switch = tgen.add_switch("s1")
+        switch.add_link(tgen.gears["r1"])
+        switch.add_link(tgen.gears["r2"])
+        switch.add_link(tgen.gears["r3"])
+
+
+def setup_module(mod):
+    tgen = Topogen(TemplateTopo, mod.__name__)
+    tgen.start_topology()
+
+    router_list = tgen.routers()
+
+    for i, (rname, router) in enumerate(router_list.items(), 1):
+        router.load_config(
+            TopoRouter.RD_ZEBRA, os.path.join(CWD, "{}/zebra.conf".format(rname))
+        )
+        router.load_config(
+            TopoRouter.RD_BGP, os.path.join(CWD, "{}/bgpd.conf".format(rname))
+        )
+
+    tgen.start_router()
+
+
+def teardown_module(mod):
+    tgen = get_topogen()
+    tgen.stop_topology()
+
+
+def test_bgp_peer_group():
+    tgen = get_topogen()
+
+    if tgen.routers_have_failure():
+        pytest.skip(tgen.errors)
+
+    def _bgp_peer_group_configured():
+        output = json.loads(tgen.gears["r1"].vtysh_cmd("show ip bgp neighbor json"))
+        expected = {
+            "r1-eth0": {"peerGroup": "PG", "bgpState": "Established"},
+            "192.168.255.3": {"peerGroup": "PG", "bgpState": "Established"},
+        }
+        return topotest.json_cmp(output, expected)
+
+    test_func = functools.partial(_bgp_peer_group_configured)
+    success, result = topotest.run_and_expect(test_func, None, count=60, wait=0.5)
+
+    assert result is None, 'Failed bgp convergence in "{}"'.format(tgen.gears["r1"])
+
+
+if __name__ == "__main__":
+    args = ["-s"] + sys.argv[1:]
+    sys.exit(pytest.main(args))