diff --git a/hathor/reactor/memory_reactor.py b/hathor/reactor/memory_reactor.py
new file mode 100644
index 000000000..2c32a706b
--- /dev/null
+++ b/hathor/reactor/memory_reactor.py
@@ -0,0 +1,53 @@
+#  Copyright 2024 Hathor Labs
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#  http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+
+from collections.abc import Mapping, Sequence
+from typing import AnyStr
+
+from twisted.internet.interfaces import IProcessProtocol, IProcessTransport
+from twisted.internet.task import Clock
+from twisted.internet.testing import MemoryReactor as TwistedMemoryReactor
+
+
+class MemoryReactor(TwistedMemoryReactor):
+    """A drop-in replacement for Twisted's own MemoryReactor that adds support for IReactorProcess."""
+
+    def run(self) -> None:
+        """
+        We have to override TwistedMemoryReactor.run() because the original Twisted implementation weirdly calls stop()
+        inside run(), and we need the reactor running during our tests.
+        """
+        self.running = True
+
+    def spawnProcess(
+        self,
+        processProtocol: IProcessProtocol,
+        executable: bytes | str,
+        args: Sequence[bytes | str],
+        env: Mapping[AnyStr, AnyStr] | None = None,
+        path: bytes | str | None = None,
+        uid: int | None = None,
+        gid: int | None = None,
+        usePTY: bool = False,
+        childFDs: Mapping[int, int | str] | None = None,
+    ) -> IProcessTransport:
+        raise NotImplementedError
+
+
+class MemoryReactorClock(MemoryReactor, Clock):
+    """A drop-in replacement for Twisted's own MemoryReactorClock that adds support for IReactorProcess."""
+
+    def __init__(self) -> None:
+        MemoryReactor.__init__(self)
+        Clock.__init__(self)
diff --git a/hathor/reactor/reactor.py b/hathor/reactor/reactor.py
index b92c80062..e33687af7 100644
--- a/hathor/reactor/reactor.py
+++ b/hathor/reactor/reactor.py
@@ -15,7 +15,7 @@
 from typing import cast
 
 from structlog import get_logger
-from twisted.internet.interfaces import IReactorCore, IReactorTCP, IReactorTime
+from twisted.internet.interfaces import IReactorCore, IReactorProcess, IReactorSocket, IReactorTCP, IReactorTime
 from zope.interface.verify import verifyObject
 
 from hathor.reactor.reactor_protocol import ReactorProtocol
@@ -76,6 +76,8 @@ def initialize_global_reactor(*, use_asyncio_reactor: bool = False) -> ReactorPr
     assert verifyObject(IReactorTime, twisted_reactor) is True
     assert verifyObject(IReactorCore, twisted_reactor) is True
     assert verifyObject(IReactorTCP, twisted_reactor) is True
+    assert verifyObject(IReactorProcess, twisted_reactor) is True
+    assert verifyObject(IReactorSocket, twisted_reactor) is True
 
     # We cast to ReactorProtocol, our own type that stubs the necessary Twisted zope interfaces, to aid typing.
     _reactor = cast(ReactorProtocol, twisted_reactor)
diff --git a/hathor/reactor/reactor_process_protocol.py b/hathor/reactor/reactor_process_protocol.py
new file mode 100644
index 000000000..0b709ee9c
--- /dev/null
+++ b/hathor/reactor/reactor_process_protocol.py
@@ -0,0 +1,38 @@
+#  Copyright 2024 Hathor Labs
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#  http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+
+from collections.abc import Mapping, Sequence
+from typing import AnyStr, Protocol
+
+from twisted.internet.interfaces import IProcessProtocol, IProcessTransport, IReactorProcess
+from zope.interface import implementer
+
+
+@implementer(IReactorProcess)
+class ReactorProcessProtocol(Protocol):
+    """A Python protocol that stubs Twisted's IReactorProcess interface."""
+
+    def spawnProcess(
+        self,
+        processProtocol: IProcessProtocol,
+        executable: bytes | str,
+        args: Sequence[bytes | str],
+        env: Mapping[AnyStr, AnyStr] | None = None,
+        path: bytes | str | None = None,
+        uid: int | None = None,
+        gid: int | None = None,
+        usePTY: bool = False,
+        childFDs: Mapping[int, int | str] | None = None,
+    ) -> IProcessTransport:
+        ...
diff --git a/hathor/reactor/reactor_protocol.py b/hathor/reactor/reactor_protocol.py
index 7c301d052..83d69a7b7 100644
--- a/hathor/reactor/reactor_protocol.py
+++ b/hathor/reactor/reactor_protocol.py
@@ -15,6 +15,8 @@
 from typing import Protocol
 
 from hathor.reactor.reactor_core_protocol import ReactorCoreProtocol
+from hathor.reactor.reactor_process_protocol import ReactorProcessProtocol
+from hathor.reactor.reactor_socket_protocol import ReactorSocketProtocol
 from hathor.reactor.reactor_tcp_protocol import ReactorTCPProtocol
 from hathor.reactor.reactor_time_protocol import ReactorTimeProtocol
 
@@ -23,9 +25,10 @@ class ReactorProtocol(
     ReactorCoreProtocol,
     ReactorTimeProtocol,
     ReactorTCPProtocol,
+    ReactorProcessProtocol,
+    ReactorSocketProtocol,
     Protocol,
 ):
     """
-    A Python protocol that represents the intersection of Twisted's IReactorCore+IReactorTime+IReactorTCP interfaces.
+    A Python protocol that represents an intersection of the Twisted reactor interfaces that we use.
     """
-    pass
diff --git a/hathor/reactor/reactor_socket_protocol.py b/hathor/reactor/reactor_socket_protocol.py
new file mode 100644
index 000000000..1ad07aa37
--- /dev/null
+++ b/hathor/reactor/reactor_socket_protocol.py
@@ -0,0 +1,45 @@
+#  Copyright 2024 Hathor Labs
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#  http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+
+from socket import AddressFamily
+from typing import Protocol
+
+from twisted.internet.interfaces import IListeningPort, IReactorSocket
+from twisted.internet.protocol import DatagramProtocol, ServerFactory
+from zope.interface import implementer
+
+
+@implementer(IReactorSocket)
+class ReactorSocketProtocol(Protocol):
+    """A Python protocol that stubs Twisted's IReactorSocket interface."""
+
+    def adoptStreamPort(
+        self,
+        fileDescriptor: int,
+        addressFamily: AddressFamily,
+        factory: ServerFactory,
+    ) -> IListeningPort:
+        ...
+
+    def adoptStreamConnection(self, fileDescriptor: int, addressFamily: AddressFamily, factory: ServerFactory) -> None:
+        ...
+
+    def adoptDatagramPort(
+        self,
+        fileDescriptor: int,
+        addressFamily: AddressFamily,
+        protocol: DatagramProtocol,
+        maxPacketSize: int,
+    ) -> IListeningPort:
+        ...
diff --git a/hathor/simulator/clock.py b/hathor/simulator/heap_clock.py
similarity index 91%
rename from hathor/simulator/clock.py
rename to hathor/simulator/heap_clock.py
index 3e0aeb4f5..92961a9c3 100644
--- a/hathor/simulator/clock.py
+++ b/hathor/simulator/heap_clock.py
@@ -17,9 +17,10 @@
 
 from twisted.internet.base import DelayedCall
 from twisted.internet.interfaces import IDelayedCall, IReactorTime
-from twisted.internet.testing import MemoryReactor
 from zope.interface import implementer
 
+from hathor.reactor.memory_reactor import MemoryReactor
+
 
 @implementer(IReactorTime)
 class HeapClock:
@@ -94,10 +95,3 @@ class MemoryReactorHeapClock(MemoryReactor, HeapClock):
     def __init__(self):
         MemoryReactor.__init__(self)
         HeapClock.__init__(self)
-
-    def run(self):
-        """
-        We have to override MemoryReactor.run() because the original Twisted implementation weirdly calls stop() inside
-        run(), and we need the reactor running during our tests.
-        """
-        self.running = True
diff --git a/hathor/simulator/simulator.py b/hathor/simulator/simulator.py
index a31862909..c74fadc3c 100644
--- a/hathor/simulator/simulator.py
+++ b/hathor/simulator/simulator.py
@@ -27,7 +27,7 @@
 from hathor.feature_activation.feature_service import FeatureService
 from hathor.manager import HathorManager
 from hathor.p2p.peer import PrivatePeer
-from hathor.simulator.clock import HeapClock, MemoryReactorHeapClock
+from hathor.simulator.heap_clock import HeapClock, MemoryReactorHeapClock
 from hathor.simulator.miner.geometric_miner import GeometricMiner
 from hathor.simulator.patches import SimulatorCpuMiningService, SimulatorVertexVerifier
 from hathor.simulator.tx_generator import RandomTransactionGenerator
diff --git a/tests/cli/test_events_simulator.py b/tests/cli/test_events_simulator.py
index 2a4ee941f..826d73737 100644
--- a/tests/cli/test_events_simulator.py
+++ b/tests/cli/test_events_simulator.py
@@ -17,13 +17,13 @@
 from hathor.cli.events_simulator.event_forwarding_websocket_factory import EventForwardingWebsocketFactory
 from hathor.cli.events_simulator.events_simulator import create_parser, execute
 from hathor.conf.get_settings import get_global_settings
-from tests.test_memory_reactor_clock import TestMemoryReactorClock
+from hathor.reactor.memory_reactor import MemoryReactorClock
 
 
 def test_events_simulator() -> None:
     parser = create_parser()
     args = parser.parse_args(['--scenario', 'ONLY_LOAD'])
-    reactor = TestMemoryReactorClock()
+    reactor = MemoryReactorClock()
 
     execute(args, reactor)
     reactor.advance(1)
diff --git a/tests/event/websocket/test_factory.py b/tests/event/websocket/test_factory.py
index 24feeab98..294206ff5 100644
--- a/tests/event/websocket/test_factory.py
+++ b/tests/event/websocket/test_factory.py
@@ -21,7 +21,7 @@
 from hathor.event.websocket.factory import EventWebsocketFactory
 from hathor.event.websocket.protocol import EventWebsocketProtocol
 from hathor.event.websocket.response import EventResponse, InvalidRequestType
-from hathor.simulator.clock import MemoryReactorHeapClock
+from hathor.simulator.heap_clock import MemoryReactorHeapClock
 from tests.utils import EventMocker
 
 
diff --git a/tests/p2p/test_bootstrap.py b/tests/p2p/test_bootstrap.py
index 26dae9097..809d10871 100644
--- a/tests/p2p/test_bootstrap.py
+++ b/tests/p2p/test_bootstrap.py
@@ -12,8 +12,8 @@
 from hathor.p2p.peer_endpoint import PeerAddress, PeerEndpoint, Protocol
 from hathor.p2p.peer_id import PeerId
 from hathor.pubsub import PubSubManager
+from hathor.reactor.memory_reactor import MemoryReactorClock
 from tests import unittest
-from tests.test_memory_reactor_clock import TestMemoryReactorClock
 
 
 class MockPeerDiscovery(PeerDiscovery):
@@ -30,7 +30,7 @@ async def discover_and_connect(self, connect_to: Callable[[PeerEndpoint], Deferr
 class MockDNSPeerDiscovery(DNSPeerDiscovery):
     def __init__(
         self,
-        reactor: TestMemoryReactorClock,
+        reactor: MemoryReactorClock,
         bootstrap_txt: list[tuple[str, int, str | None]],
         bootstrap_a: list[str],
     ):
diff --git a/tests/poa/test_poa_block_producer.py b/tests/poa/test_poa_block_producer.py
index 3be849470..807570581 100644
--- a/tests/poa/test_poa_block_producer.py
+++ b/tests/poa/test_poa_block_producer.py
@@ -22,14 +22,14 @@
 from hathor.consensus.poa import PoaBlockProducer
 from hathor.crypto.util import get_public_key_bytes_compressed
 from hathor.manager import HathorManager
+from hathor.reactor.memory_reactor import MemoryReactorClock
 from hathor.transaction.poa import PoaBlock
 from tests.poa.utils import get_settings, get_signer
-from tests.test_memory_reactor_clock import TestMemoryReactorClock
 from tests.unittest import TestBuilder
 
 
 def _get_manager(settings: HathorSettings) -> HathorManager:
-    reactor = TestMemoryReactorClock()
+    reactor = MemoryReactorClock()
     reactor.advance(settings.GENESIS_BLOCK_TIMESTAMP)
 
     artifacts = TestBuilder() \
@@ -45,7 +45,7 @@ def test_poa_block_producer_one_signer() -> None:
     settings = get_settings(signer, time_between_blocks=10)
     manager = _get_manager(settings)
     reactor = manager.reactor
-    assert isinstance(reactor, TestMemoryReactorClock)
+    assert isinstance(reactor, MemoryReactorClock)
     manager = Mock(wraps=manager)
     producer = PoaBlockProducer(settings=settings, reactor=reactor, poa_signer=signer)
     producer.manager = manager
@@ -103,7 +103,7 @@ def test_poa_block_producer_two_signers() -> None:
     settings = get_settings(signer1, signer2, time_between_blocks=10)
     manager = _get_manager(settings)
     reactor = manager.reactor
-    assert isinstance(reactor, TestMemoryReactorClock)
+    assert isinstance(reactor, MemoryReactorClock)
     manager = Mock(wraps=manager)
     producer = PoaBlockProducer(settings=settings, reactor=reactor, poa_signer=signer1)
     producer.manager = manager
diff --git a/tests/pubsub/test_pubsub2.py b/tests/pubsub/test_pubsub2.py
index d0ede02ac..d258bd76d 100644
--- a/tests/pubsub/test_pubsub2.py
+++ b/tests/pubsub/test_pubsub2.py
@@ -16,9 +16,9 @@
 from unittest.mock import Mock, patch
 
 import pytest
-from twisted.internet.testing import MemoryReactorClock
 
 from hathor.pubsub import HathorEvents, PubSubManager
+from hathor.reactor.memory_reactor import MemoryReactorClock
 
 
 @pytest.mark.parametrize('is_in_main_thread', [False, True])
diff --git a/tests/test_memory_reactor_clock.py b/tests/test_memory_reactor_clock.py
deleted file mode 100644
index 48e8a6d48..000000000
--- a/tests/test_memory_reactor_clock.py
+++ /dev/null
@@ -1,26 +0,0 @@
-#  Copyright 2023 Hathor Labs
-#
-#  Licensed under the Apache License, Version 2.0 (the "License");
-#  you may not use this file except in compliance with the License.
-#  You may obtain a copy of the License at
-#
-#  http://www.apache.org/licenses/LICENSE-2.0
-#
-#  Unless required by applicable law or agreed to in writing, software
-#  distributed under the License is distributed on an "AS IS" BASIS,
-#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-#  See the License for the specific language governing permissions and
-#  limitations under the License.
-
-from twisted.internet.testing import MemoryReactorClock
-
-
-class TestMemoryReactorClock(MemoryReactorClock):
-    __test__ = False
-
-    def run(self):
-        """
-        We have to override MemoryReactor.run() because the original Twisted implementation weirdly calls stop() inside
-        run(), and we need the reactor running during our tests.
-        """
-        self.running = True
diff --git a/tests/tx/test_merged_mining.py b/tests/tx/test_merged_mining.py
index ebf032bb1..9367b9604 100644
--- a/tests/tx/test_merged_mining.py
+++ b/tests/tx/test_merged_mining.py
@@ -25,7 +25,7 @@ async def test_coordinator(self):
         from cryptography.hazmat.primitives.asymmetric import ec
 
         from hathor.crypto.util import get_address_b58_from_public_key
-        from hathor.simulator.clock import MemoryReactorHeapClock
+        from hathor.simulator.heap_clock import MemoryReactorHeapClock
 
         super().setUp()
         self.manager = self.create_peer('testnet')
diff --git a/tests/tx/test_stratum.py b/tests/tx/test_stratum.py
index 1445684b4..128e32a11 100644
--- a/tests/tx/test_stratum.py
+++ b/tests/tx/test_stratum.py
@@ -7,7 +7,7 @@
 import pytest
 from twisted.internet.testing import StringTransportWithDisconnection
 
-from hathor.simulator.clock import MemoryReactorHeapClock
+from hathor.simulator.heap_clock import MemoryReactorHeapClock
 from hathor.stratum import (
     INVALID_PARAMS,
     INVALID_REQUEST,
diff --git a/tests/unittest.py b/tests/unittest.py
index 4a659f6bd..8fb195b68 100644
--- a/tests/unittest.py
+++ b/tests/unittest.py
@@ -24,13 +24,13 @@
 from hathor.p2p.sync_version import SyncVersion
 from hathor.pubsub import PubSubManager
 from hathor.reactor import ReactorProtocol as Reactor, get_global_reactor
-from hathor.simulator.clock import MemoryReactorHeapClock
+from hathor.reactor.memory_reactor import MemoryReactorClock
+from hathor.simulator.heap_clock import MemoryReactorHeapClock
 from hathor.transaction import BaseTransaction, Block, Transaction
 from hathor.transaction.storage.transaction_storage import TransactionStorage
 from hathor.types import VertexId
 from hathor.util import Random, not_none
 from hathor.wallet import BaseWallet, HDWallet, Wallet
-from tests.test_memory_reactor_clock import TestMemoryReactorClock
 from tests.utils import GENESIS_SEED
 
 logger = get_logger()
@@ -117,7 +117,7 @@ class TestCase(unittest.TestCase):
 
     def setUp(self) -> None:
         self.tmpdirs: list[str] = []
-        self.clock = TestMemoryReactorClock()
+        self.clock = MemoryReactorClock()
         self.clock.advance(time.time())
         self.reactor = self.clock
         self.log = logger.new()