Handle `mp` spawn method cases in test suite

examples/advanced_faults/ipc_failure_during_stream.py

@@ -64,14 +64,17 @@ async def recv_and_spawn_net_killers(
             if i > 80:
                 n.start_soon(break_channel_silently_then_error, stream)
                 n.start_soon(close_stream_and_error, stream)
+                await trio.sleep_forever()
 
 
 async def main(
-    debug_mode: bool = True,
+    debug_mode: bool = False,
+    start_method: str = 'trio',
 
 ) -> None:
 
     async with open_nursery(
+        start_method=start_method,
 
         # NOTE: even debugger is used we shouldn't get
         # a hang since it never engages due to broken IPC
@@ -88,6 +91,8 @@ async def main(
         ) as (ctx, sent):
             async with ctx.open_stream() as stream:
                 for i in range(100):
+
+                    # this may break in the mp_spawn case
                     await stream.send(i)
 
                     with trio.move_on_after(2) as cs:

tests/conftest.py

@@ -159,7 +159,7 @@ def loglevel(request):
 
 
 @pytest.fixture(scope='session')
-def spawn_backend(request):
+def spawn_backend(request) -> str:
     return request.config.option.spawn_backend
 
 

tests/test_advanced_faults.py

@@ -19,6 +19,7 @@ from conftest import (
 )
 def test_child_breaks_ipc_channel_during_stream(
     debug_mode: bool,
+    spawn_backend: str,
 ):
     '''
     Ensure we can (purposely) break IPC during streaming and it's still
@@ -26,13 +27,22 @@ def test_child_breaks_ipc_channel_during_stream(
     SIGINT.
 
     '''
+    expect_final_exc = KeyboardInterrupt
+
+    if spawn_backend != 'trio':
+        if debug_mode:
+            pytest.skip('`debug_mode` only supported on `trio` spawner')
+
+        expect_final_exc = trio.ClosedResourceError
+
     mod = import_path(
         examples_dir() / 'advanced_faults' / 'ipc_failure_during_stream.py',
         root=examples_dir(),
     )
 
-    with pytest.raises(KeyboardInterrupt):
+    with pytest.raises(expect_final_exc):
         trio.run(
             mod.main,
             debug_mode,
+            spawn_backend,
         )