Add close channel test with remote arbiter

tests/test_discovery.py

@@ -199,7 +199,7 @@ def test_subactors_unregister_on_cancel(
             spawn_and_check_registry,
             arb_addr,
             use_signal,
-            False,
+            False,  # remote arbiter
             with_streaming,
             arbiter_addr=arb_addr
         )
@@ -223,32 +223,35 @@ def test_subactors_unregister_on_cancel_remote_daemon(
             spawn_and_check_registry,
             arb_addr,
             use_signal,
-            True,
+            True,  # remote arbiter
             with_streaming,
             # XXX: required to use remote daemon!
             arbiter_addr=arb_addr
         )
 
 
-@pytest.mark.parametrize('use_signal', [False, True])
-def test_close_channel_explicit(
-    daemon,
-    start_method,
-    use_signal,
-    arb_addr,
-):
-    """Verify that closing a stream explicitly and killing the actor's
-    "root nursery" **before** the containing nursery tears down also
-    results in subactor(s) deregistering from the arbiter.
-    """
 async def streamer(agen):
     async for item in agen:
         print(item)
 
-    async def main():
+
+async def close_chans_before_nursery(
+    arb_addr: tuple,
+    use_signal: bool,
+    remote_arbiter: bool = False,
+) -> None:
+
+    # logic for how many actors should still be
+    # in the registry at teardown.
+    if remote_arbiter:
+        entries_at_end = 2
+    else:
+        entries_at_end = 1
+
     async with tractor.get_arbiter(*arb_addr) as aportal:
         try:
             get_reg = partial(aportal.run, 'self', 'get_registry')
+
             async with tractor.open_nursery() as tn:
                 portal1 = await tn.run_in_actor('consumer1', stream_forever)
                 agen1 = await portal1.result()
@@ -262,14 +265,14 @@ def test_close_channel_explicit(
                     try:
                         await streamer(agen2)
                     finally:
-                            # XXX: THIS IS THE KEY THING that happens
-                            # **before** exiting the actor nursery block
-
                         # Kill the root nursery thus resulting in
                         # normal arbiter channel ops to fail during
                         # teardown. It doesn't seem like this is
                         # reliably triggered by an external SIGINT.
-                            tractor.current_actor()._root_nursery.cancel_scope.cancel()
+                        # tractor.current_actor()._root_nursery.cancel_scope.cancel()
+
+                        # XXX: THIS IS THE KEY THING that happens
+                        # **before** exiting the actor nursery block
 
                         # also kill off channels cuz why not
                         await agen1.aclose()
@@ -282,12 +285,47 @@ def test_close_channel_explicit(
                 registry = await get_reg()
                 assert portal1.channel.uid not in registry
                 assert portal2.channel.uid not in registry
-                    assert len(registry) == 2
+                assert len(registry) == entries_at_end
 
 
+@pytest.mark.parametrize('use_signal', [False, True])
+def test_close_channel_explicit(
+    start_method,
+    use_signal,
+    arb_addr,
+):
+    """Verify that closing a stream explicitly and killing the actor's
+    "root nursery" **before** the containing nursery tears down also
+    results in subactor(s) deregistering from the arbiter.
+    """
     with pytest.raises(KeyboardInterrupt):
         tractor.run(
-            main,
+            close_chans_before_nursery,
+            arb_addr,
+            use_signal,
+            False,
+            # XXX: required to use remote daemon!
+            arbiter_addr=arb_addr
+        )
+
+
+@pytest.mark.parametrize('use_signal', [False, True])
+def test_close_channel_explicit_remote_arbiter(
+    daemon,
+    start_method,
+    use_signal,
+    arb_addr,
+):
+    """Verify that closing a stream explicitly and killing the actor's
+    "root nursery" **before** the containing nursery tears down also
+    results in subactor(s) deregistering from the arbiter.
+    """
+    with pytest.raises(KeyboardInterrupt):
+        tractor.run(
+            close_chans_before_nursery,
+            arb_addr,
+            use_signal,
+            True,
             # XXX: required to use remote daemon!
             arbiter_addr=arb_addr
         )