diff --git a/tests/test-worker.t b/tests/test-worker.t
--- a/tests/test-worker.t
+++ b/tests/test-worker.t
@@ -83,8 +83,10 @@
   [255]
 
   $ hg --config "extensions.t=$abspath" --config 'worker.numcpus=8' \
-  > test 100000.0 abort --traceback 2>&1 | egrep '^(SystemExit|Abort)'
-  Abort: known exception
+  > test 100000.0 abort --traceback 2>&1 | egrep '(SystemExit|Abort)'
+      raise error.Abort(b'known exception')
+  mercurial.error.Abort: b'known exception' (py3 !)
+  Abort: known exception (no-py3 !)
   SystemExit: 255
 
 Traceback must be printed for unknown exceptions