make sure iopub thread is started in test

stop closes the event puller socket, but only if start was called
ipython · May 8, 2023 · 6c12316 · 6c12316
1 parent d8a6f29
commit 6c12316
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/ipykernel/tests/test_io.py b/ipykernel/tests/test_io.py
@@ -123,6 +123,7 @@ def subprocess_test_echo_watch():
     with zmq.Context() as ctx, ctx.socket(zmq.PUSH) as pub:
         pub.connect(os.environ["IOPUB_URL"])
         iopub_thread = IOPubThread(pub)
+        iopub_thread.start()
         stdout_fd = sys.stdout.fileno()
         sys.stdout.flush()
         stream = OutStream(