diff --git a/test/conftest.py b/test/conftest.py
new file mode 100644
index 0000000..1e51aca
--- /dev/null
+++ b/test/conftest.py
@@ -0,0 +1,37 @@
+import sys
+from unittest.mock import MagicMock
+
+import sys
+from unittest.mock import MagicMock
+
+def pytest_configure(config):
+    """
+    This hook runs at the start of the pytest session, before any tests are
+    collected. It mocks heavy or unavailable modules to prevent ImportErrors.
+    """
+    # --- Mock spade and spade-bdi ---
+    mock_spade = MagicMock()
+    mock_spade.agent = MagicMock()
+    mock_spade.behaviour = MagicMock()
+    mock_spade_bdi = MagicMock()
+    mock_spade_bdi.bdi = MagicMock()
+
+    mock_spade.agent.Message = MagicMock()
+    mock_spade.behaviour.CyclicBehaviour = type('CyclicBehaviour', (object,), {})
+    mock_spade_bdi.bdi.BDIAgent = type('BDIAgent', (object,), {})
+
+    sys.modules['spade'] = mock_spade
+    sys.modules['spade.agent'] = mock_spade.agent
+    sys.modules['spade.behaviour'] = mock_spade.behaviour
+    sys.modules['spade_bdi'] = mock_spade_bdi
+    sys.modules['spade_bdi.bdi'] = mock_spade_bdi.bdi
+
+    # --- Mock the config module to prevent Pydantic ImportError ---
+    mock_config_module = MagicMock()
+    
+    # The code under test does `from ... import settings`, so our mock module
+    # must have a `settings` attribute. We'll make it a MagicMock so we can
+    # configure it later in our tests using mocker.patch.
+    mock_config_module.settings = MagicMock()
+    
+    sys.modules['control_backend.core.config'] = mock_config_module
diff --git a/test/unit/agents/bdi/behaviours/test_belief_setter.py b/test/unit/agents/bdi/behaviours/test_belief_setter.py
index 471d310..8932834 100644
--- a/test/unit/agents/bdi/behaviours/test_belief_setter.py
+++ b/test/unit/agents/bdi/behaviours/test_belief_setter.py
@@ -1,10 +1,8 @@
-import asyncio
 import json
 import logging
 from unittest.mock import MagicMock, AsyncMock, call
 
 import pytest
-from spade.agent import Message
 
 from control_backend.agents.bdi.behaviours.belief_setter import BeliefSetter
 
@@ -40,6 +38,15 @@ def belief_setter(mock_agent, mocker):
     return setter
 
 
+def create_mock_message(sender_node: str, body: str, thread: str) -> MagicMock:
+    """Helper function to create a configured mock message."""
+    msg = MagicMock()
+    msg.sender.node = sender_node  # MagicMock automatically creates nested mocks
+    msg.body = body
+    msg.thread = thread
+    return msg
+
+
 @pytest.mark.asyncio
 async def test_run_no_message_received(belief_setter, mocker):
     """
@@ -62,7 +69,7 @@ async def test_run_message_received(belief_setter, mocker):
     Test that when a message is received, _process_message is called.
     """
     # Arrange
-    msg = Message(to="bdi_agent@test")
+    msg = MagicMock();
     belief_setter.receive.return_value = msg
     mocker.patch.object(belief_setter, "_process_message")
 
@@ -78,7 +85,7 @@ def test_process_message_from_belief_collector(belief_setter, mocker):
     Test processing a message from the correct belief collector agent.
     """
     # Arrange
-    msg = Message(to="bdi_agent@test", sender=COLLECTOR_AGENT_JID)
+    msg = create_mock_message(sender_node=COLLECTOR_AGENT_NAME, body="", thread="")
     mock_process_belief = mocker.patch.object(belief_setter, "_process_belief_message")
 
     # Act
@@ -93,7 +100,7 @@ def test_process_message_from_other_agent(belief_setter, mocker):
     Test that messages from other agents are ignored.
     """
     # Arrange
-    msg = Message(to="bdi_agent@test", sender="other_agent@test")
+    msg = create_mock_message(sender_node="other_agent", body="", thread="")
     mock_process_belief = mocker.patch.object(belief_setter, "_process_belief_message")
 
     # Act
@@ -112,9 +119,8 @@ def test_process_belief_message_valid_json(belief_setter, mocker):
         "is_hot": [["kitchen"]],
         "is_clean": [["kitchen"], ["bathroom"]]
     }
-    msg = Message(
-        to="bdi_agent@test",
-        sender=COLLECTOR_AGENT_JID,
+    msg = create_mock_message(
+        sender_node=COLLECTOR_AGENT_JID,
         body=json.dumps(beliefs_payload),
         thread="beliefs"
     )
@@ -132,9 +138,8 @@ def test_process_belief_message_invalid_json(belief_setter, mocker, caplog):
     Test that a message with invalid JSON is handled gracefully and an error is logged.
     """
     # Arrange
-    msg = Message(
-        to="bdi_agent@test",
-        sender=COLLECTOR_AGENT_JID,
+    msg = create_mock_message(
+        sender_node=COLLECTOR_AGENT_JID,
         body="this is not a json string",
         thread="beliefs"
     )
@@ -154,9 +159,8 @@ def test_process_belief_message_wrong_thread(belief_setter, mocker):
     Test that a message with an incorrect thread is ignored.
     """
     # Arrange
-    msg = Message(
-        to="bdi_agent@test",
-        sender=COLLECTOR_AGENT_JID,
+    msg = create_mock_message(
+        sender_node=COLLECTOR_AGENT_JID,
         body='{"some": "data"}',
         thread="not_beliefs"
     )
@@ -173,9 +177,8 @@ def test_process_belief_message_empty_body(belief_setter, mocker):
     Test that a message with an empty body is ignored.
     """
     # Arrange
-    msg = Message(
-        to="bdi_agent@test",
-        sender=COLLECTOR_AGENT_JID,
+    msg = create_mock_message(
+        sender_node=COLLECTOR_AGENT_JID,
         body="",
         thread="beliefs"
     )