test(net): check output in test_high_ingress_traffic

If we supply an invalid iperf binary to the test it still passes.
This adds checks for the command output.  While doing that, increase
the timeout to let the command finish without hitting it.

Signed-off-by: Nikita Kalyazin <[email protected]>

Author: kalyazin

tests/integration_tests/functional/test_net.py

@@ -33,13 +33,13 @@ def test_high_ingress_traffic(uvm_plain_any):
     test_microvm.start()
 
     # Start iperf3 server on the guest.
-    test_microvm.ssh.run("{} -sD\n".format(IPERF_BINARY))
+    test_microvm.ssh.check_output("{} -sD\n".format(IPERF_BINARY))
     time.sleep(1)
 
     # Start iperf3 client on the host. Send 1Gbps UDP traffic.
     # If the net device breaks, iperf will freeze. We have to use a timeout.
-    utils.run_cmd(
-        "timeout 30 {} {} -c {} -u -V -b 1000000000 -t 30".format(
+    utils.check_output(
+        "timeout 31 {} {} -c {} -u -V -b 1000000000 -t 30".format(
             test_microvm.netns.cmd_prefix(),
             IPERF_BINARY,
             guest_ip,