tests: add a non-json simple ospf test for development

This simple OSPF test utilizes less "magic" testing infrastructure. This
is useful when doing OSPF development as a quick way to enable a feature
to help test or develop it.

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

tests/topotests/ospf_simple/r1/frr.conf

@@ -0,0 +1,25 @@
+log timestamp precision 6
+log file frr.log
+
+debug northbound notifications
+debug northbound libyang
+debug northbound events
+debug northbound callbacks
+
+debug mgmt backend datastore frontend transaction
+debug mgmt client frontend
+
+debug mgmt client backend
+
+interface r1-eth0
+ ip address 10.0.1.1/24
+ ip ospf hello-interval 3
+ ip ospf dead-interval 10
+ ip ospf retransmit-interval 2
+
+ip route 11.0.0.0/8 Null0
+
+router ospf
+ ospf router-id 1.1.1.1
+ network 10.0.0.0/16 area 0.0.0.0
+ redistribute static

tests/topotests/ospf_simple/r2/frr.conf

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+interface r2-eth0
+ ip address 10.0.1.2/24
+ ip ospf hello-interval 3
+ ip ospf dead-interval 10
+ ip ospf retransmit-interval 2
+interface r2-eth1
+ ip address 10.0.2.2/24
+ ip ospf hello-interval 3
+ ip ospf dead-interval 10
+ ip ospf retransmit-interval 2
+
+ip route 22.0.0.0/8 Null0
+
+router ospf
+ ospf router-id 2.2.2.2
+ network 10.0.0.0/16 area 0.0.0.0
+ redistribute static

tests/topotests/ospf_simple/r3/frr.conf

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+interface r3-eth0
+ ip address 10.0.2.3/24
+ ip ospf hello-interval 3
+ ip ospf dead-interval 10
+ ip ospf retransmit-interval 2
+
+ip route 33.0.0.0/8 Null0
+
+router ospf
+ ospf router-id 3.3.3.3
+ network 10.0.0.0/16 area 0.0.0.0
+ redistribute static

tests/topotests/ospf_simple/test_ospf_simple.py

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+#!/usr/bin/env python
+# -*- coding: utf-8 eval: (blacken-mode 1) -*-
+# SPDX-License-Identifier: ISC
+#
+# <template>.py
+# Part of NetDEF Topology Tests
+#
+# Copyright (c) 2017 by
+# Network Device Education Foundation, Inc. ("NetDEF")
+#
+
+"""
+<template>.py: Test <template>.
+"""
+
+import sys
+
+import pytest
+from lib.topogen import Topogen, TopoRouter
+from lib.topolog import logger
+
+pytestmark = [
+    pytest.mark.ospfd,
+]
+
+
+# New form of setup/teardown using pytest fixture
+@pytest.fixture(scope="module")
+def tgen(request):
+    "Setup/Teardown the environment and provide tgen argument to tests"
+
+    topodef = {
+        "s0": ("r1", "r2"),
+        "s1": ("r2", "r3"),
+    }
+
+    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()
+
+
+# Fixture that executes before each test
+@pytest.fixture(autouse=True)
+def skip_on_failure(tgen):
+    if tgen.routers_have_failure():
+        pytest.skip("skipped because of previous test failure")
+
+
+# ===================
+# The tests functions
+# ===================
+
+
+def test_get_version(tgen):
+    "Test the logs the FRR version"
+
+    # tgen.gears["r1"].net.cmd_nostatus(
+    #     "vtysh -c 'debug ospfd client frontend' " "-c 'debug ospfd client backend' "
+    # )
+
+    # stepf("about to get version")
+
+    r1 = tgen.gears["r1"]
+    version = r1.vtysh_cmd("show version")
+    logger.info("FRR version is: " + version)