Test coroutine interrupt

ipykernel/tests/test_async.py

@@ -1,7 +1,7 @@
 """Test async/await integration"""
 
 from distutils.version import LooseVersion as V
-import sys
+import time
 
 import pytest
 import IPython
@@ -46,8 +46,10 @@ def test_async_interrupt(asynclib, request):
     assert content["status"] == "ok", content
 
     flush_channels(KC)
+    wait_time = 5
+    t0 = time.time()
     msg_id = KC.execute(
-        f"print('begin'); import {asynclib}; await {asynclib}.sleep(5)"
+        f"print('begin'); import {asynclib}; await {asynclib}.sleep({wait_time})"
     )
     busy = KC.get_iopub_msg(timeout=TIMEOUT)
     validate_message(busy, "status", msg_id)
@@ -61,7 +63,10 @@ def test_async_interrupt(asynclib, request):
 
     KM.interrupt_kernel()
     reply = KC.get_shell_msg()["content"]
+    t1 = time.time()
     assert reply["status"] == "error", reply
     assert reply["ename"] in {"CancelledError", "KeyboardInterrupt"}
+    # interrupting should not wait for the coroutine execution to complete
+    assert t1 - t0 < wait_time
 
     flush_channels(KC)