Add tests which verify the readme is correct

- steal from `trio` and add a `tractor_test` decorator
- use a random arbiter port to avoid conflicts with locally running
  systems
- add all the (obviously) hilarious readme tests
- add a complex cancellation test which works with
  `trio.move_on_after()`

tests/test_tractor.py

@@ -2,13 +2,34 @@
 Actor model API testing
 """
 import time
-from functools import partial
+from functools import partial, wraps
+import random
 
 import pytest
 import trio
 import tractor
 
 
+_arb_addr = '127.0.0.1', random.randint(1000, 9999)
+
+
+def tractor_test(fn):
+    """
+    Use:
+
+    @tractor_test
+    async def test_whatever():
+        await ...
+    """
+    @wraps(fn)
+    def wrapper(*args, **kwargs):
+        __tracebackhide__ = True
+        return tractor.run(
+            partial(fn, *args), arbiter_addr=_arb_addr, **kwargs)
+
+    return wrapper
+
+
 @pytest.mark.trio
 async def test_no_arbitter():
     """An arbitter must be established before any nurseries
@@ -36,7 +57,7 @@ def test_local_actor_async_func():
             await trio.sleep(0.1)
 
     start = time.time()
-    tractor.run(print_loop)
+    tractor.run(print_loop, arbiter_addr=_arb_addr)
 
     # ensure the sleeps were actually awaited
     assert time.time() - start >= 1
@@ -82,6 +103,7 @@ def test_local_arbiter_subactor_global_state():
         True,
         name='arbiter',
         statespace=statespace,
+        arbiter_addr=_arb_addr,
     )
     assert result == 10
 
@@ -135,7 +157,7 @@ async def stream_from_single_subactor():
 def test_stream_from_single_subactor():
     """Verify streaming from a spawned async generator.
     """
-    tractor.run(stream_from_single_subactor)
+    tractor.run(stream_from_single_subactor, arbiter_addr=_arb_addr)
 
 
 async def assert_err():
@@ -162,7 +184,92 @@ def test_remote_error():
 
     with pytest.raises(tractor.RemoteActorError):
         # also raises
-        tractor.run(main)
+        tractor.run(main, arbiter_addr=_arb_addr)
+
+
+the_line = 'Hi my name is {}'
+
+
+async def hi():
+    return the_line.format(tractor.current_actor().name)
+
+
+async def say_hello(other_actor):
+    await trio.sleep(0.4)  # wait for other actor to spawn
+    async with tractor.find_actor(other_actor) as portal:
+        return await portal.run(__name__, 'hi')
+
+
+@tractor_test
+async def test_trynamic_trio():
+    """Main tractor entry point, the "master" process (for now
+    acts as the "director").
+    """
+    async with tractor.open_nursery() as n:
+        print("Alright... Action!")
+
+        donny = await n.start_actor(
+            'donny',
+            main=partial(say_hello, 'gretchen'),
+            rpc_module_paths=[__name__],
+            outlive_main=True
+        )
+        gretchen = await n.start_actor(
+            'gretchen',
+            main=partial(say_hello, 'donny'),
+            rpc_module_paths=[__name__],
+            # outlive_main=True
+        )
+        print(await gretchen.result())
+        print(await donny.result())
+        await donny.cancel_actor()
+        print("CUTTTT CUUTT CUT!!?! Donny!! You're supposed to say...")
+
+
+def movie_theatre_question():
+    """A question asked in a dark theatre, in a tangent
+    (errr, I mean different) process.
+    """
+    return 'have you ever seen a portal?'
+
+
+@tractor_test
+async def test_movie_theatre_convo():
+    """The main ``tractor`` routine.
+    """
+    async with tractor.open_nursery() as n:
+        portal = await n.start_actor(
+            'frank',
+            # enable the actor to run funcs from this current module
+            rpc_module_paths=[__name__],
+            outlive_main=True,
+        )
+
+        print(await portal.run(__name__, 'movie_theatre_question'))
+        # calls the subactor a 2nd time
+        print(await portal.run(__name__, 'movie_theatre_question'))
+
+        # the async with will block here indefinitely waiting
+        # for our actor "frank" to complete, but since it's an
+        # "outlive_main" actor it will never until cancelled
+        await portal.cancel_actor()
+
+
+def cellar_door():
+    return "Dang that's beautiful"
+
+
+@tractor_test
+async def test_most_beautiful_word():
+    """The main ``tractor`` routine.
+    """
+    async with tractor.open_nursery() as n:
+        portal = await n.start_actor('some_linguist', main=cellar_door)
+
+    # The ``async with`` will unblock here since the 'some_linguist'
+    # actor has completed its main task ``cellar_door``.
+
+    print(await portal.result())
 
 
 def do_nothing():
@@ -178,18 +285,17 @@ def test_cancel_single_subactor():
             portal = await nursery.start_actor(
                 'nothin', rpc_module_paths=[__name__],
             )
-            assert not await portal.run(__name__, 'do_nothing')
+            assert (await portal.run(__name__, 'do_nothing')) is None
 
             # would hang otherwise
             await nursery.cancel()
 
-    tractor.run(main)
+    tractor.run(main, arbiter_addr=_arb_addr)
 
 
 async def stream_data(seed):
     for i in range(seed):
         yield i
-        # await trio.sleep(1/10000.)  # trigger scheduler
         await trio.sleep(0)  # trigger scheduler
 
 
@@ -209,7 +315,7 @@ async def aggregate(seed):
 
             portals.append(portal)
 
-        q = trio.Queue(int(1e3))
+        q = trio.Queue(500)
 
         async def push_to_q(portal):
             async for value in await portal.run(
@@ -231,11 +337,11 @@ async def aggregate(seed):
                     unique_vals.add(value)
                     # yield upwards to the spawning parent actor
                     yield value
-                    continue
+
+                    if value is None:
+                        break
 
                 assert value in unique_vals
-                if value is None:
-                    break
 
             print("FINISHED ITERATING in aggregator")
 
@@ -244,13 +350,15 @@ async def aggregate(seed):
     print("AGGREGATOR COMPLETE!")
 
 
-async def main():
+# @tractor_test
+async def a_quadruple_example():
     # a nursery which spawns "actors"
     async with tractor.open_nursery() as nursery:
 
         seed = int(10)
         import time
         pre_start = time.time()
+
         portal = await nursery.start_actor(
             name='aggregator',
             # executed in the actor's "main task" immediately
@@ -269,13 +377,21 @@ async def main():
         assert result_stream == list(range(seed)) + [None]
 
 
-def test_show_me_the_code():
+async def cancel_after(wait):
+    with trio.move_on_after(wait):
+        await a_quadruple_example()
+
+
+def test_a_quadruple_example():
     """Verify the *show me the code* readme example works.
     """
-    tractor.run(main, arbiter_addr=('127.0.0.1', 1616))
+    tractor.run(cancel_after, 2, arbiter_addr=_arb_addr)
 
 
-def test_cancel_smtc():
-    """Verify we can cancel midway through the smtc example gracefully.
+def test_not_fast_enough_quad():
+    """Verify we can cancel midway through the quad example and all actors
+    cancel gracefully.
+
+    This also serves as a kind of "we'd like to eventually be this fast test".
     """
-    pass
+    tractor.run(cancel_after, 1, arbiter_addr=_arb_addr)