test: fix NETCONF backend to propagate RPC errors

The put_config() retry loop was catching and printing RpcError
exceptions but never re-raising them after exhausting retries.
This caused tests to silently continue despite configuration
failures, masking validation errors.

Now properly propagates errors after all retries are exhausted,
matching the error handling behavior of the RESTCONF backend.

Fixes #1250

Signed-off-by: Joachim Wiberg <[email protected]>

Author: troglobit

test/infamy/netconf.py

@@ -297,14 +297,21 @@ def put_config(self, edit):
             xml = xml.replace(f"yang:operation=\"{src}\"",
                               f"nc:operation=\"{dst}\"" if dst else "")
 
+        last_error = None
         for _ in range(0, 3):
             try:
                 self.ncc.edit_config(xml, default_operation='merge')
+                last_error = None
+                break
             except RpcError as _e:
+                last_error = _e
                 print(f"Failed sending edit-config RPC: {_e}  Retrying ...")
                 time.sleep(1)
                 continue
-            break
+
+        # If we exhausted all retries, raise the last error
+        if last_error is not None:
+            raise last_error
 
     def put_config_dicts(self, models):
         """PUT full configuration of all models to running-config"""