diff --git a/fleet_vehicle_ownership/tests/__init__.py b/fleet_vehicle_ownership/tests/__init__.py
index a9afeec5..e3f32ac3 100644
--- a/fleet_vehicle_ownership/tests/__init__.py
+++ b/fleet_vehicle_ownership/tests/__init__.py
@@ -2,3 +2,5 @@
 # License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
 
 from . import test_owner
+
+from . import test_partner
diff --git a/fleet_vehicle_ownership/tests/test_partner.py b/fleet_vehicle_ownership/tests/test_partner.py
new file mode 100644
index 00000000..d3f43cdb
--- /dev/null
+++ b/fleet_vehicle_ownership/tests/test_partner.py
@@ -0,0 +1,46 @@
+from odoo.tests import common
+
+
+class TestResPartner(common.TransactionCase):
+
+    def setUp(self):
+        super(TestResPartner, self).setUp()
+
+        # Create necessary test data here, such as a partner and vehicles
+        self.partner = self.env['res.partner'].create({
+            'name': 'Lewis Hamilton',
+        })
+        self.vehicle1 = self.env['fleet.vehicle'].create({
+            'name': 'W14',
+            'owner_id': self.partner.id,
+        })
+        self.vehicle2 = self.env['fleet.vehicle'].create({
+            'name': 'W13',
+            'owner_id': self.partner.id,
+        })
+
+    def test_compute_vehicle_count(self):
+        # Check if the vehicle count is computed correctly
+        self.partner._compute_vehicle_count()
+        self.assertEqual(self.partner.vehicle_count, 2, "Vehicle count is incorrect")
+
+    def test_action_view_vehicles(self):
+        # Check if action_view_vehicles method returns the correct action
+        action = self.partner.action_view_vehicles()
+
+        # Assert that the action is correctly configured
+        self.assertEqual(action['res_model'], 'fleet.vehicle', "Incorrect res_model in action")
+        self.assertEqual(action['name'], 'Vehicles', "Incorrect name in action")
+
+        # Test when there is more than one vehicle
+        self.partner.vehicle_count = 2
+        action = self.partner.action_view_vehicles()
+        self.assertTrue(action['domain'], [("id", "in", self.partner.vehicle_ids.ids)],
+                        "Incorrect domain when multiple vehicles")
+
+        # Test when there is only one vehicle
+        self.partner.vehicle_count = 1
+        action = self.partner.action_view_vehicles()
+        self.assertEqual(action['views'], [(self.env.ref("fleet.fleet_vehicle_view_form").id, "form")],
+                         "Incorrect views when only one vehicle")
+        self.assertEqual(action['res_id'], self.partner.vehicle_ids.ids[0], "Incorrect res_id when only one vehicle")