diff --git a/simple_message_channels/__init__.py b/simple_message_channels/__init__.py
index 96eda65..037bc65 100644
--- a/simple_message_channels/__init__.py
+++ b/simple_message_channels/__init__.py
@@ -1,3 +1,2 @@
 """simple-message-channels module."""
-
 from simple_message_channels.smc import SimpleMessageChannel  # noqa
diff --git a/simple_message_channels/smc.py b/simple_message_channels/smc.py
index 58b99ba..3e7b2b1 100644
--- a/simple_message_channels/smc.py
+++ b/simple_message_channels/smc.py
@@ -1,11 +1,10 @@
 """Sans I/O wire protocol for Hypercore"""
-
-__all__ = ["SimpleMessageChannel"]
-
 from typing import List, Optional
 
 import attr
+import pyvarint
 
+__all__ = ["SimpleMessageChannel"]
 
 @attr.s(auto_attribs=True)
 class SimpleMessageChannel:
diff --git a/test/test_smc.py b/test/test_smc.py
index 30223bd..384364b 100644
--- a/test/test_smc.py
+++ b/test/test_smc.py
@@ -3,15 +3,3 @@ async def test_send_produces_bytes(smc):
 
     payload = await smc.send(channel, type, message)
     assert isinstance(payload, bytes)
-
-
-# async def test_recv_context_manager(smc):
-#     channel, type, message = 0, 0, b"abc"
-
-#     payload = await smc.send(channel, type, message)
-#     assert isinstance(payload, bytes)
-
-#     async with smc.recv(payload) as response:
-#         assert response.channel == channel
-#         assert response.type == type
-#         assert response.message == message