Missing a platform.system() check

tests/test_streaming.py

@@ -239,10 +239,11 @@ def test_not_fast_enough_quad(
     results, diff = time_quad_ex
     delay = max(diff - cancel_delay, 0)
     results = tractor.run(cancel_after, delay, arbiter_addr=arb_addr)
-    if platform.system() == 'Windows' and results is not None:
+    system = platform.system()
+    if system in ('Windows', 'Darwin') and results is not None:
         # In Windows CI it seems later runs are quicker then the first
         # so just ignore these
-        print("Woa there windows caught your breath eh?")
+        print(f"Woa there {system} caught your breath eh?")
     else:
         # should be cancelled mid-streaming
         assert results is None