1 files changed, 5 insertions, 34 deletions
diff --git a/tests/topotests/ospf_basic_functionality/test_ospf_nssa.py b/tests/topotests/ospf_basic_functionality/test_ospf_nssa.py
index 0af83548b9..aa34208acb 100644
--- a/tests/topotests/ospf_basic_functionality/test_ospf_nssa.py
+++ b/tests/topotests/ospf_basic_functionality/test_ospf_nssa.py
@@ -25,14 +25,11 @@
 import ipaddress
 from lib.ospf import (
     verify_ospf_neighbor,
-    config_ospf_interface,
-    clear_ospf,
     verify_ospf_rib,
     create_router_ospf,
-    verify_ospf_interface,
     redistribute_ospf,
 )
-from lib.topojson import build_topo_from_json, build_config_from_json
+from lib.topojson import build_config_from_json
 from lib.topolog import logger
 from lib.common_config import (
     start_topology,
@@ -42,19 +39,13 @@ from lib.common_config import (
     verify_rib,
     create_static_routes,
     step,
-    create_route_maps,
-    shutdown_bringup_interface,
-    create_interfaces_cfg,
     topo_daemons,
 )
-from ipaddress import IPv4Address
 from lib.topogen import Topogen, get_topogen
-from mininet.topo import Topo
 import os
 import sys
 import time
 import pytest
-import json
 
 # Save the Current Working Directory to find configuration files.
 CWD = os.path.dirname(os.path.realpath(__file__))
@@ -68,13 +59,6 @@ pytestmark = [pytest.mark.ospfd, pytest.mark.staticd]
 
 # Global variables
 topo = None
-# Reading the data from JSON File for topology creation
-jsonFile = "{}/ospf_nssa.json".format(CWD)
-try:
-    with open(jsonFile, "r") as topoJson:
-        topo = json.load(topoJson)
-except IOError:
-    assert False, "Could not read file {}".format(jsonFile)
 NETWORK = {
     "ipv4": [
         "11.0.20.1/32",
@@ -111,28 +95,12 @@ TESTCASES =
 """
 
 
-class CreateTopo(Topo):
-    """
-    Test topology builder.
-
-    * `Topo`: Topology object
-    """
-
-    def build(self, *_args, **_opts):
-        """Build function."""
-        tgen = get_topogen(self)
-
-        # Building topology from json file
-        build_topo_from_json(tgen, topo)
-
-
 def setup_module(mod):
     """
     Sets up the pytest environment
 
     * `mod`: module name
     """
-    global topo
     testsuite_run_time = time.asctime(time.localtime(time.time()))
     logger.info("Testsuite start time: {}".format(testsuite_run_time))
     logger.info("=" * 40)
@@ -140,7 +108,10 @@ def setup_module(mod):
     logger.info("Running setup_module to create topology")
 
     # This function initiates the topology build with Topogen...
-    tgen = Topogen(CreateTopo, mod.__name__)
+    json_file = "{}/ospf_nssa.json".format(CWD)
+    tgen = Topogen(json_file, mod.__name__)
+    global topo
+    topo = tgen.json_topo
     # ... and here it calls Mininet initialization functions.
 
     # get list of daemons needs to be started for this suite.