tests/test_ethernetport: create and set event loop for test

Calling asyncio.get_event_loop() with no current event loop is deprecated
since Python 3.10 and will be an error in some future Python release
[1].

SNMPEthernetPort expects a running event loop. So create and set one.

[1] https://docs.python.org/3/library/asyncio-eventloop.html#asyncio.get_event_loop

Signed-off-by: Bastian Krause <[email protected]>

Author: Bastian-Krause

tests/test_ethernetport.py

@@ -1,6 +1,15 @@
+import asyncio
+
 from labgrid.resource import SNMPEthernetPort
 
 
 def test_instance(target):
-    s = SNMPEthernetPort(target, 'port-1', switch='dummy-switch', interface='1')
-    assert (isinstance(s, SNMPEthernetPort))
+    # SNMPEthernetPort should be called with a running event loop
+    loop = asyncio.new_event_loop()
+    asyncio.set_event_loop(loop)
+
+    try:
+        s = SNMPEthernetPort(target, 'port-1', switch='dummy-switch', interface='1')
+        assert (isinstance(s, SNMPEthernetPort))
+    finally:
+        loop.close()