topogen: import pytest assert function

Use the pytest assert function to be able to report to pytest failures
that happened inside the API.

Signed-off-by: Rafael Zalamena <rzalamena@opensourcerouting.org>

diff --git a/tests/topotests/lib/topogen.py b/tests/topotests/lib/topogen.py
index 2ea05c9742b42752a75b8e59a1b2f8f7491fa264..116dd9a41e6bc2c1f1e9aff067e820216b0c132f 100644 (file)
--- a/tests/topotests/lib/topogen.py
+++ b/tests/topotests/lib/topogen.py
@@ -48,6 +48,7 @@ import grp
 import platform
 import pwd
 import subprocess
+import pytest
 
 from mininet.net import Mininet
 from mininet.log import setLogLevel