Fixed some tuple/list mismatch in test_comms

distributed/comm/tests/test_comms.py

@@ -1018,7 +1018,7 @@ async def check_deserialize(addr):
     msg = {
         "op": "update",
         "x": b"abc",
-        "to_ser": (to_serialize(123),),
+        "to_ser": [to_serialize(123)],
         "ser": Serialized(*serialize(456)),
     }
     msg_orig = msg.copy()
@@ -1036,7 +1036,7 @@ def check_out_false(out_value):
         assert isinstance(ser, Serialized)
         assert deserialize(ser.header, ser.frames) == 456
 
-        assert isinstance(to_ser, tuple) and len(to_ser) == 1
+        assert isinstance(to_ser, list) and len(to_ser) == 1
         (to_ser,) = to_ser
         # The to_serialize() value could have been actually serialized
         # or not (it's a transport-specific optimization)
@@ -1049,7 +1049,7 @@ def check_out_true(out_value):
         # Check output with deserialize=True
         expected_msg = msg.copy()
         expected_msg["ser"] = 456
-        expected_msg["to_ser"] = (123,)
+        expected_msg["to_ser"] = [123]
         assert out_value == expected_msg
 
     await check_listener_deserialize(addr, False, msg, check_out_false)