diff --git a/tests/interop/test_bindings.py b/tests/interop/test_bindings.py
index 7844d4b..1189e0b 100644
--- a/tests/interop/test_bindings.py
+++ b/tests/interop/test_bindings.py
@@ -1,8 +1,7 @@
-import asyncio
-
-from multiaddr import Multiaddr
 import pytest
 
+from .utils import connect
+
 
 @pytest.mark.parametrize("num_hosts", (1,))
 @pytest.mark.asyncio
@@ -11,19 +10,15 @@ async def test_connect(hosts, p2pds):
     host = hosts[0]
     assert len(await p2pd.control.list_peers()) == 0
     # Test: connect from Py
-    await host.connect(p2pd.peer_info)
+    await connect(host, p2pd)
     assert len(await p2pd.control.list_peers()) == 1
     # Test: `disconnect` from Py
     await host.disconnect(p2pd.peer_id)
     assert len(await p2pd.control.list_peers()) == 0
     # Test: connect from Go
-    py_peer_id = host.get_id()
-    await p2pd.control.connect(
-        host.get_id(),
-        [host.get_addrs()[0].decapsulate(Multiaddr(f"/p2p/{py_peer_id.to_string()}"))],
-    )
+    await connect(p2pd, host)
     assert len(host.get_network().connections) == 1
     # Test: `disconnect` from Go
-    await p2pd.control.disconnect(py_peer_id)
+    await p2pd.control.disconnect(host.get_id())
     # FIXME: Failed to handle disconnect
     # assert len(host.get_network().connections) == 0
diff --git a/tests/interop/test_pubsub.py b/tests/interop/test_pubsub.py
new file mode 100644
index 0000000..a9ad1f8
--- /dev/null
+++ b/tests/interop/test_pubsub.py
@@ -0,0 +1,7 @@
+import pytest
+
+
+@pytest.mark.parametrize("num_hosts", (1,))
+@pytest.mark.asyncio
+async def test_gossipsub(pubsubs_gsub, p2pds):
+    pass
diff --git a/tests/interop/utils.py b/tests/interop/utils.py
new file mode 100644
index 0000000..d613727
--- /dev/null
+++ b/tests/interop/utils.py
@@ -0,0 +1,40 @@
+import asyncio
+from typing import Union
+
+from multiaddr import Multiaddr
+
+from libp2p.host.host_interface import IHost
+from libp2p.peer.peerinfo import PeerInfo
+
+from .daemon import Daemon
+
+TDaemonOrHost = Union[IHost, Daemon]
+
+
+async def connect(a: TDaemonOrHost, b: TDaemonOrHost) -> None:
+    # Type check
+    err_msg = (
+        f"Type of type(a)={type(a)} or type(b)={type(b)} is wrong."
+        "Should be either `IHost` or `Daemon`"
+    )
+    assert all(
+        [isinstance(node, IHost) or isinstance(node, Daemon) for node in (a, b)]
+    ), err_msg
+
+    # TODO: Get peer info
+    peer_info: PeerInfo
+    if isinstance(b, Daemon):
+        peer_info = b.peer_info
+    else:  # isinstance(b, IHost)
+        peer_id = b.get_id()
+        maddrs = [
+            b.get_addrs()[0].decapsulate(Multiaddr(f"/p2p/{peer_id.to_string()}"))
+        ]
+        peer_info = PeerInfo(peer_id, maddrs)
+    # TODO: connect to peer info
+    if isinstance(a, Daemon):
+        await a.control.connect(peer_info.peer_id, peer_info.addrs)
+    else:  # isinstance(b, IHost)
+        await a.connect(peer_info)
+    # Allow additional sleep for both side to establish the connection.
+    await asyncio.sleep(0.01)