Add a clustering test

tests/test_clustering.py

@@ -0,0 +1,41 @@
+import itertools
+
+import trio
+import tractor
+from tractor import open_actor_cluster
+from tractor.trionics import async_enter_all
+
+from conftest import tractor_test
+
+
+MESSAGE = 'tractoring at full speed'
+
+
+@tractor.context
+async def worker(ctx: tractor.Context) -> None:
+    await ctx.started()
+    async with ctx.open_stream() as stream:
+        async for msg in stream:
+            # do something with msg
+            print(msg)
+            assert msg == MESSAGE
+
+
+@tractor_test
+async def test_streaming_to_actor_cluster() -> None:
+    teardown_trigger = trio.Event()
+    async with (
+        open_actor_cluster(modules=[__name__]) as portals,
+        async_enter_all(
+            mngrs=[p.open_context(worker) for p in portals.values()],
+            teardown_trigger=teardown_trigger,
+        ) as contexts,
+        async_enter_all(
+            mngrs=[ctx[0].open_stream() for ctx in contexts],
+            teardown_trigger=teardown_trigger,
+        ) as streams,
+    ):
+        with trio.move_on_after(1):
+            for stream in itertools.cycle(streams):
+                await stream.send(MESSAGE)
+        teardown_trigger.set()