diff --git a/hr_negative_leave/tests/__init__.py b/hr_negative_leave/tests/__init__.py
new file mode 100644
index 0000000..2314210
--- /dev/null
+++ b/hr_negative_leave/tests/__init__.py
@@ -0,0 +1 @@
+from . import test_hr_negative_leave
\ No newline at end of file
diff --git a/hr_negative_leave/tests/test_hr_negative_leave.py b/hr_negative_leave/tests/test_hr_negative_leave.py
new file mode 100644
index 0000000..b012ba9
--- /dev/null
+++ b/hr_negative_leave/tests/test_hr_negative_leave.py
@@ -0,0 +1,91 @@
+from datetime import date, timedelta
+
+from odoo.tests import tagged
+from odoo.tests.common import TransactionCase
+from odoo.exceptions import UserError
+
+
+@tagged('post_install', '-at_install')
+class TestHrNegativeLeave(TransactionCase):
+    def setUp(self):
+        super().setUp()
+
+        # create a simple employee
+        self.employee = self.env['hr.employee'].create({
+            'name': 'NegTest Employee',
+        })
+        # create a user
+        self.user = self.env['res.users'].create({
+            'name': 'Test user',
+            'login': 'test user',
+            'employee_id': self.employee.id,
+        })
+        # prepare a leave type and an allocation with 1 day available
+        self.leave_type = self.env['hr.leave.type'].create({
+            'name': 'NegTest Type',
+            'request_unit': 'day',
+            'requires_allocation': 'yes',
+            'allows_negative': False,
+        })
+        self.allocation = self.env['hr.leave.allocation'].create({
+            'name': 'Alloc 1d',
+            'employee_id': self.employee.id,
+            'holiday_status_id': self.leave_type.id,
+            'number_of_days': 1.0,
+            'date_from': date.today() - timedelta(days=1),
+            'allocation_type': 'regular',
+        })
+
+    def test_negative_not_allowed_raises(self):
+
+        self.allocation.action_validate()
+        #self.leave_type._compute_leaves()
+
+        """If the leave type does NOT allow negative, trying to confirm a leave
+        that exceeds allocations should raise a UserError."""
+        leave = self.env['hr.leave'].create({
+            'name': 'Too many days',
+            'employee_id': self.employee.id,
+            'holiday_status_id': self.leave_type.id,
+            'request_date_from': date.today(),
+            'request_date_to': date.today() + timedelta(days=1),
+            'number_of_days': 2.0,
+            'state': 'draft',
+        })
+        # self.leave_type._compute_leaves()
+
+        with self.assertRaises(UserError):
+            leave.write({'state': 'validate'})
+
+    def test_negative_allowed_allows_excess(self):
+
+        self.env.user = self.user
+        self.env.user.employee_id = self.employee
+
+        self.allocation.action_validate()
+
+        """If the leave type allows negative, confirming a leave that exceeds
+        allocations must NOT raise an error."""
+        # flip the flag on the leave type
+        self.leave_type.allows_negative = True
+        leave = self.env['hr.leave'].create({
+            'name': 'Too many days',
+            'employee_id': self.employee.id,
+            'holiday_status_id': self.leave_type.id,
+            'date_from': date.today(),
+            'date_to': date.today() + timedelta(days=1),
+            'number_of_days': 2.0,
+            'state': 'draft',
+        })
+        # should not raise
+        leave.write({'state': 'confirm'})
+
+        # check remaining leaves is negative
+        self.leave_type._compute_leaves()
+
+        # Allocated in time off popup (Alloué)
+        self.assertEqual(self.leave_type.max_leaves, 1, "max_leaves should be 1",)
+        # Approuved in time off popup (Approuvé)
+        self.assertEqual(self.leave_type.virtual_leaves_taken, 2, "virtual_leaves_taken should be 2",)
+        # Remaining in time off popup (Restants)
+        self.assertEqual(self.leave_type.max_leaves - self.leave_type.virtual_leaves_taken, -1, "remaining leaves should display in timeoff popup -1",)