diff --git a/libp2p/host/basic_host.py b/libp2p/host/basic_host.py
index cdee9a0..e6fc515 100644
--- a/libp2p/host/basic_host.py
+++ b/libp2p/host/basic_host.py
@@ -107,3 +107,9 @@ class BasicHost(IHost):
             return
 
         await self._network.dial_peer(peer_info.peer_id)
+
+    async def disconnect(self, peer_id: ID) -> None:
+        await self._network.close_peer(peer_id)
+
+    async def close(self) -> None:
+        await self._network.close()
diff --git a/libp2p/host/host_interface.py b/libp2p/host/host_interface.py
index bcaefad..6b1ef03 100644
--- a/libp2p/host/host_interface.py
+++ b/libp2p/host/host_interface.py
@@ -71,3 +71,11 @@ class IHost(ABC):
         :param peer_info: peer_info of the host we want to connect to
         :type peer_info: peer.peerinfo.PeerInfo
         """
+
+    @abstractmethod
+    async def disconnect(self, peer_id: ID) -> None:
+        pass
+
+    @abstractmethod
+    async def close(self) -> None:
+        pass
diff --git a/libp2p/network/network_interface.py b/libp2p/network/network_interface.py
index d9cdf48..9ed2d16 100644
--- a/libp2p/network/network_interface.py
+++ b/libp2p/network/network_interface.py
@@ -70,3 +70,11 @@ class INetwork(ABC):
         :param notifee: object implementing Notifee interface
         :return: true if notifee registered successfully, false otherwise
         """
+
+    @abstractmethod
+    async def close(self) -> None:
+        pass
+
+    @abstractmethod
+    async def close_peer(self, peer_id: ID) -> None:
+        pass
diff --git a/libp2p/network/swarm.py b/libp2p/network/swarm.py
index 52df727..d0f2fe8 100644
--- a/libp2p/network/swarm.py
+++ b/libp2p/network/swarm.py
@@ -264,12 +264,24 @@ class Swarm(INetwork):
     def add_router(self, router: IPeerRouting) -> None:
         self.router = router
 
-    # TODO: `tear_down`
-    async def tear_down(self) -> None:
-        # Reference: https://github.com/libp2p/go-libp2p-swarm/blob/8be680aef8dea0a4497283f2f98470c2aeae6b65/swarm.go#L118  # noqa: E501
-        pass
+    async def close(self) -> None:
+        # TODO: Prevent from new listeners and conns being added.
+        #   Reference: https://github.com/libp2p/go-libp2p-swarm/blob/8be680aef8dea0a4497283f2f98470c2aeae6b65/swarm.go#L124-L134  # noqa: E501
 
-    # TODO: `disconnect`?
+        # Close listeners
+        await asyncio.gather(
+            *[listener.close() for listener in self.listeners.values()]
+        )
+
+        # Close connections
+        await asyncio.gather(
+            *[connection.close() for connection in self.connections.values()]
+        )
+
+    async def close_peer(self, peer_id: ID) -> None:
+        connection = self.connections[peer_id]
+        del self.connections[peer_id]
+        await connection.close()
 
 
 def create_generic_protocol_handler(swarm: Swarm) -> GenericProtocolHandlerFn:
diff --git a/libp2p/stream_muxer/mplex/mplex.py b/libp2p/stream_muxer/mplex/mplex.py
index 40fa67b..5f55a66 100644
--- a/libp2p/stream_muxer/mplex/mplex.py
+++ b/libp2p/stream_muxer/mplex/mplex.py
@@ -1,5 +1,6 @@
 import asyncio
-from typing import Dict, Optional, Tuple
+from typing import Any  # noqa: F401
+from typing import Dict, List, Optional, Tuple
 
 from libp2p.network.typing import GenericProtocolHandlerFn
 from libp2p.peer.id import ID
@@ -34,6 +35,8 @@ class Mplex(IMuxedConn):
     stream_queue: "asyncio.Queue[StreamID]"
     next_channel_id: int
 
+    _tasks: List["asyncio.Future[Any]"]
+
     # TODO: `generic_protocol_handler` should be refactored out of mplex conn.
     def __init__(
         self,
@@ -63,8 +66,10 @@ class Mplex(IMuxedConn):
 
         self.stream_queue = asyncio.Queue()
 
+        self._tasks = []
+
         # Kick off reading
-        asyncio.ensure_future(self.handle_incoming())
+        self._tasks.append(asyncio.ensure_future(self.handle_incoming()))
 
     @property
     def initiator(self) -> bool:
@@ -74,6 +79,8 @@ class Mplex(IMuxedConn):
         """
         close the stream muxer and underlying secured connection
         """
+        for task in self._tasks:
+            task.cancel()
         await self.secured_conn.close()
 
     def is_closed(self) -> bool:
@@ -135,7 +142,7 @@ class Mplex(IMuxedConn):
         """
         stream_id = await self.stream_queue.get()
         stream = MplexStream(name, stream_id, self)
-        asyncio.ensure_future(self.generic_protocol_handler(stream))
+        self._tasks.append(asyncio.ensure_future(self.generic_protocol_handler(stream)))
 
     async def send_message(
         self, flag: HeaderTags, data: bytes, stream_id: StreamID
diff --git a/libp2p/transport/listener_interface.py b/libp2p/transport/listener_interface.py
index fecc3b9..9664f06 100644
--- a/libp2p/transport/listener_interface.py
+++ b/libp2p/transport/listener_interface.py
@@ -21,9 +21,8 @@ class IListener(ABC):
         """
 
     @abstractmethod
-    def close(self) -> bool:
+    async def close(self) -> None:
         """
         close the listener such that no more connections
         can be open on this transport instance
-        :return: return True if successful
         """
diff --git a/libp2p/transport/tcp/tcp.py b/libp2p/transport/tcp/tcp.py
index 8e29f9b..49c7d9b 100644
--- a/libp2p/transport/tcp/tcp.py
+++ b/libp2p/transport/tcp/tcp.py
@@ -45,20 +45,16 @@ class TCPListener(IListener):
         # TODO check if server is listening
         return self.multiaddrs
 
-    def close(self) -> bool:
+    async def close(self) -> None:
         """
         close the listener such that no more connections
         can be open on this transport instance
-        :return: return True if successful
         """
         if self.server is None:
-            return False
+            return
         self.server.close()
-        _loop = asyncio.get_event_loop()
-        _loop.run_until_complete(self.server.wait_closed())
-        _loop.close()
+        await self.server.wait_closed()
         self.server = None
-        return True
 
 
 class TCP(ITransport):
diff --git a/tests/conftest.py b/tests/conftest.py
new file mode 100644
index 0000000..9101fa6
--- /dev/null
+++ b/tests/conftest.py
@@ -0,0 +1,33 @@
+import asyncio
+
+import pytest
+
+from .configs import LISTEN_MADDR
+from .factories import HostFactory
+
+
+@pytest.fixture
+def is_host_secure():
+    return False
+
+
+@pytest.fixture
+def num_hosts():
+    return 3
+
+
+@pytest.fixture
+async def hosts(num_hosts, is_host_secure):
+    _hosts = HostFactory.create_batch(num_hosts, is_secure=is_host_secure)
+    await asyncio.gather(
+        *[_host.get_network().listen(LISTEN_MADDR) for _host in _hosts]
+    )
+    try:
+        yield _hosts
+    finally:
+        # TODO: It's possible that `close` raises exceptions currently,
+        #   due to the connection reset things. Though we are not so careful about that when
+        #   cleaning up the tasks, it is probably better to handle the exceptions properly.
+        await asyncio.gather(
+            *[_host.close() for _host in _hosts], return_exceptions=True
+        )
diff --git a/tests/pubsub/factories.py b/tests/factories.py
similarity index 51%
rename from tests/pubsub/factories.py
rename to tests/factories.py
index b57c29b..0604094 100644
--- a/tests/pubsub/factories.py
+++ b/tests/factories.py
@@ -1,12 +1,17 @@
+from typing import Dict
+
 import factory
 
-from libp2p import initialize_default_swarm
-from libp2p.crypto.rsa import create_new_key_pair
+from libp2p import generate_new_rsa_identity, initialize_default_swarm
+from libp2p.crypto.keys import KeyPair
 from libp2p.host.basic_host import BasicHost
 from libp2p.pubsub.floodsub import FloodSub
 from libp2p.pubsub.gossipsub import GossipSub
 from libp2p.pubsub.pubsub import Pubsub
-from tests.configs import LISTEN_MADDR
+from libp2p.security.base_transport import BaseSecureTransport
+from libp2p.security.insecure.transport import PLAINTEXT_PROTOCOL_ID, InsecureTransport
+from libp2p.security.secio.transport import ID, Transport
+from libp2p.typing import TProtocol
 from tests.pubsub.configs import (
     FLOODSUB_PROTOCOL_ID,
     GOSSIPSUB_PARAMS,
@@ -14,16 +19,34 @@ from tests.pubsub.configs import (
 )
 
 
-def swarm_factory():
-    private_key = create_new_key_pair()
-    return initialize_default_swarm(private_key, transport_opt=[str(LISTEN_MADDR)])
+def security_transport_factory(
+    is_secure: bool, key_pair: KeyPair
+) -> Dict[TProtocol, BaseSecureTransport]:
+    protocol_id: TProtocol
+    security_transport: BaseSecureTransport
+    if not is_secure:
+        protocol_id = PLAINTEXT_PROTOCOL_ID
+        security_transport = InsecureTransport(key_pair)
+    else:
+        protocol_id = ID
+        security_transport = Transport(key_pair)
+    return {protocol_id: security_transport}
+
+
+def swarm_factory(is_secure: bool):
+    key_pair = generate_new_rsa_identity()
+    sec_opt = security_transport_factory(is_secure, key_pair)
+    return initialize_default_swarm(key_pair, sec_opt=sec_opt)
 
 
 class HostFactory(factory.Factory):
     class Meta:
         model = BasicHost
 
-    network = factory.LazyFunction(swarm_factory)
+    class Params:
+        is_secure = False
+
+    network = factory.LazyAttribute(lambda o: swarm_factory(o.is_secure))
 
 
 class FloodsubFactory(factory.Factory):
diff --git a/tests/interop/test_echo.py b/tests/interop/test_echo.py
index 57f7bd3..513ea86 100644
--- a/tests/interop/test_echo.py
+++ b/tests/interop/test_echo.py
@@ -7,11 +7,8 @@ from multiaddr import Multiaddr
 import pexpect
 import pytest
 
-from libp2p import generate_new_rsa_identity, new_node
 from libp2p.peer.peerinfo import info_from_p2p_addr
-from libp2p.security.insecure.transport import PLAINTEXT_PROTOCOL_ID, InsecureTransport
 from libp2p.typing import TProtocol
-from tests.configs import LISTEN_MADDR
 
 GOPATH = pathlib.Path(os.environ["GOPATH"])
 ECHO_PATH = GOPATH / "bin" / "echo"
@@ -19,50 +16,68 @@ ECHO_PROTOCOL_ID = TProtocol("/echo/1.0.0")
 NEW_LINE = "\r\n"
 
 
-@pytest.mark.asyncio
-async def test_insecure_conn_py_to_go(unused_tcp_port):
+@pytest.fixture
+def proc_factory():
+    procs = []
+
+    def call_proc(cmd, args, logfile=None, encoding=None):
+        if logfile is None:
+            logfile = sys.stdout
+        if encoding is None:
+            encoding = "utf-8"
+        proc = pexpect.spawn(cmd, args, logfile=logfile, encoding=encoding)
+        procs.append(proc)
+        return proc
+
     try:
-        go_proc = pexpect.spawn(
-            str(ECHO_PATH),
-            [f"-l={unused_tcp_port}", "-insecure"],
-            logfile=sys.stdout,
-            encoding="utf-8",
-        )
-        await go_proc.expect(r"I am ([\w\./]+)" + NEW_LINE, async_=True)
-        maddr_str = go_proc.match.group(1)
-        maddr_str = maddr_str.replace("ipfs", "p2p")
-        maddr = Multiaddr(maddr_str)
-        go_pinfo = info_from_p2p_addr(maddr)
-        await go_proc.expect("listening for connections", async_=True)
-
-        key_pair = generate_new_rsa_identity()
-        insecure_tpt = InsecureTransport(key_pair)
-        host = await new_node(
-            key_pair=key_pair, sec_opt={PLAINTEXT_PROTOCOL_ID: insecure_tpt}
-        )
-        await host.connect(go_pinfo)
-        await go_proc.expect("swarm listener accepted connection", async_=True)
-        s = await host.new_stream(go_pinfo.peer_id, [ECHO_PROTOCOL_ID])
-
-        await go_proc.expect("Got a new stream!", async_=True)
-        data = "data321123\n"
-        await s.write(data.encode())
-        await go_proc.expect(f"read: {data[:-1]}", async_=True)
-        echoed_resp = await s.read(len(data))
-        assert echoed_resp.decode() == data
-        await s.close()
+        yield call_proc
     finally:
-        go_proc.close()
+        for proc in procs:
+            proc.close()
 
 
+async def make_echo_proc(
+    proc_factory, port: int, is_secure: bool, destination: Multiaddr = None
+):
+    args = [f"-l={port}"]
+    if not is_secure:
+        args.append("-insecure")
+    if destination is not None:
+        args.append(f"-d={str(destination)}")
+    echo_proc = proc_factory(str(ECHO_PATH), args, logfile=sys.stdout, encoding="utf-8")
+    await echo_proc.expect(r"I am ([\w\./]+)" + NEW_LINE, async_=True)
+    maddr_str_ipfs = echo_proc.match.group(1)
+    maddr_str = maddr_str_ipfs.replace("ipfs", "p2p")
+    maddr = Multiaddr(maddr_str)
+    go_pinfo = info_from_p2p_addr(maddr)
+    if destination is None:
+        await echo_proc.expect("listening for connections", async_=True)
+    return echo_proc, go_pinfo
+
+
+@pytest.mark.parametrize("num_hosts", (1,))
 @pytest.mark.asyncio
-async def test_insecure_conn_go_to_py(unused_tcp_port):
-    key_pair = generate_new_rsa_identity()
-    insecure_tpt = InsecureTransport(key_pair)
-    host = await new_node(
-        key_pair=key_pair, sec_opt={PLAINTEXT_PROTOCOL_ID: insecure_tpt}
-    )
-    await host.get_network().listen(LISTEN_MADDR)
+async def test_insecure_conn_py_to_go(hosts, proc_factory, unused_tcp_port):
+    go_proc, go_pinfo = await make_echo_proc(proc_factory, unused_tcp_port, False)
+
+    host = hosts[0]
+    await host.connect(go_pinfo)
+    await go_proc.expect("swarm listener accepted connection", async_=True)
+    s = await host.new_stream(go_pinfo.peer_id, [ECHO_PROTOCOL_ID])
+
+    await go_proc.expect("Got a new stream!", async_=True)
+    data = "data321123\n"
+    await s.write(data.encode())
+    await go_proc.expect(f"read: {data[:-1]}", async_=True)
+    echoed_resp = await s.read(len(data))
+    assert echoed_resp.decode() == data
+    await s.close()
+
+
+@pytest.mark.parametrize("num_hosts", (1,))
+@pytest.mark.asyncio
+async def test_insecure_conn_go_to_py(hosts, proc_factory, unused_tcp_port):
+    host = hosts[0]
     expected_data = "Hello, world!\n"
     reply_data = "Replyooo!\n"
     event_handler_finished = asyncio.Event()
@@ -76,17 +91,8 @@ async def test_insecure_conn_go_to_py(unused_tcp_port):
 
     host.set_stream_handler(ECHO_PROTOCOL_ID, _handle_echo)
     py_maddr = host.get_addrs()[0]
-    go_proc = pexpect.spawn(
-        str(ECHO_PATH),
-        [f"-l={unused_tcp_port}", "-insecure", f"-d={str(py_maddr)}"],
-        logfile=sys.stdout,
-        encoding="utf-8",
-    )
-    try:
-        await go_proc.expect(r"I am ([\w\./]+)" + NEW_LINE, async_=True)
-        await go_proc.expect("connect with peer", async_=True)
-        await go_proc.expect("opened stream", async_=True)
-        await event_handler_finished.wait()
-        await go_proc.expect(f"read reply: .*{reply_data.rstrip()}.*", async_=True)
-    finally:
-        go_proc.close()
+    go_proc, _ = await make_echo_proc(proc_factory, unused_tcp_port, False, py_maddr)
+    await go_proc.expect("connect with peer", async_=True)
+    await go_proc.expect("opened stream", async_=True)
+    await event_handler_finished.wait()
+    await go_proc.expect(f"read reply: .*{reply_data.rstrip()}.*", async_=True)
diff --git a/tests/pubsub/conftest.py b/tests/pubsub/conftest.py
index 12faff3..1755ee5 100644
--- a/tests/pubsub/conftest.py
+++ b/tests/pubsub/conftest.py
@@ -1,38 +1,7 @@
-import asyncio
-
 import pytest
 
-from tests.configs import LISTEN_MADDR
+from tests.factories import FloodsubFactory, GossipsubFactory, PubsubFactory
 from tests.pubsub.configs import GOSSIPSUB_PARAMS
-from tests.pubsub.factories import (
-    FloodsubFactory,
-    GossipsubFactory,
-    HostFactory,
-    PubsubFactory,
-)
-
-
-@pytest.fixture
-def num_hosts():
-    return 3
-
-
-@pytest.fixture
-async def hosts(num_hosts):
-    _hosts = HostFactory.create_batch(num_hosts)
-    await asyncio.gather(
-        *[_host.get_network().listen(LISTEN_MADDR) for _host in _hosts]
-    )
-    try:
-        yield _hosts
-    finally:
-        # Clean up
-        listeners = []
-        for _host in _hosts:
-            for listener in _host.get_network().listeners.values():
-                listener.server.close()
-                listeners.append(listener)
-        await asyncio.gather(*[listener.server.wait_closed() for listener in listeners])
 
 
 @pytest.fixture
diff --git a/tests/pubsub/dummy_account_node.py b/tests/pubsub/dummy_account_node.py
index c2ca8bf..98a224f 100644
--- a/tests/pubsub/dummy_account_node.py
+++ b/tests/pubsub/dummy_account_node.py
@@ -5,8 +5,8 @@ from libp2p.host.host_interface import IHost
 from libp2p.pubsub.floodsub import FloodSub
 from libp2p.pubsub.pubsub import Pubsub
 from tests.configs import LISTEN_MADDR
+from tests.factories import FloodsubFactory, PubsubFactory
 
-from .factories import FloodsubFactory, PubsubFactory
 from .utils import message_id_generator
 
 CRYPTO_TOPIC = "ethereum"
diff --git a/tests/pubsub/floodsub_integration_test_settings.py b/tests/pubsub/floodsub_integration_test_settings.py
index 09e5c30..d96fc2b 100644
--- a/tests/pubsub/floodsub_integration_test_settings.py
+++ b/tests/pubsub/floodsub_integration_test_settings.py
@@ -3,10 +3,10 @@ import asyncio
 import pytest
 
 from tests.configs import LISTEN_MADDR
+from tests.factories import PubsubFactory
 from tests.utils import cleanup, connect
 
 from .configs import FLOODSUB_PROTOCOL_ID
-from .factories import PubsubFactory
 
 SUPPORTED_PROTOCOLS = [FLOODSUB_PROTOCOL_ID]
 
diff --git a/tests/pubsub/test_floodsub.py b/tests/pubsub/test_floodsub.py
index 0a67c65..7e079d1 100644
--- a/tests/pubsub/test_floodsub.py
+++ b/tests/pubsub/test_floodsub.py
@@ -3,9 +3,9 @@ import asyncio
 import pytest
 
 from libp2p.peer.id import ID
+from tests.factories import FloodsubFactory
 from tests.utils import cleanup, connect
 
-from .factories import FloodsubFactory
 from .floodsub_integration_test_settings import (
     floodsub_protocol_pytest_params,
     perform_test_from_obj,
diff --git a/tests/pubsub/test_gossipsub_backward_compatibility.py b/tests/pubsub/test_gossipsub_backward_compatibility.py
index e76ce04..3f2224f 100644
--- a/tests/pubsub/test_gossipsub_backward_compatibility.py
+++ b/tests/pubsub/test_gossipsub_backward_compatibility.py
@@ -2,8 +2,9 @@ import functools
 
 import pytest
 
+from tests.factories import GossipsubFactory
+
 from .configs import FLOODSUB_PROTOCOL_ID
-from .factories import GossipsubFactory
 from .floodsub_integration_test_settings import (
     floodsub_protocol_pytest_params,
     perform_test_from_obj,