[IMP] hr_holidays: add test for multi-company global leave

Adds a test following a fix done in odoo/odoo#143381
That fix ensured that the public leave used to
compute leaves intervals for the resources are
in the same company as the resource.

task-3668605

closes odoo/odoo#152827

Signed-off-by: Sofie Gvaladze (sgv) <sgv@odoo.com>

addons/hr_holidays/tests/__init__.py

@@ -21,3 +21,4 @@ from . import test_holidays_calendar
 from . import test_negative
 from . import test_past_accruals
 from . import test_allocations
+from . import test_multicompany

addons/hr_holidays/tests/test_multicompany.py

@@ -0,0 +1,41 @@
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+from datetime import date, datetime
+
+from odoo import tests
+from odoo.addons.hr_holidays.tests.common import TestHrHolidaysCommon
+
+
+@tests.tagged('post_install', '-at_install')
+class TestHrHolidaysAccessRightsCommon(TestHrHolidaysCommon):
+
+    @classmethod
+    def setUpClass(cls):
+        super(TestHrHolidaysAccessRightsCommon, cls).setUpClass()
+        cls.company_2 = cls.env['res.company'].create({'name': 'Test company 2'})
+
+    def test_unrelated_public_leave(self):
+        public_leave = self.env['resource.calendar.leaves'].create({
+            'name': 'Global Time Off for Company 2',
+            'resource_id': False,
+            'date_from': datetime(2024, 1, 3, 6, 0, 0),
+            'date_to': datetime(2024, 1, 3, 19, 0, 0),
+        })
+        public_leave.company_id = self.company_2
+        leave_type = self.env['hr.leave.type'].create({
+            'name': 'Test Leave Type',
+            'requires_allocation': 'no',
+            'request_unit': 'day',
+            'company_id': False,
+        })
+        leave = self.env['hr.leave'].create({
+            'name': '3 days leave',
+            'employee_id': self.employee_emp_id,
+            'holiday_status_id': leave_type.id,
+            'request_date_from': date(2024, 1, 2),
+            'request_date_to': datetime(2024, 1, 4),
+        })
+        self.assertNotEqual(public_leave.company_id, self.employee_emp.company_id)
+        self.assertEqual(
+            leave.number_of_days, 3,
+            "The leave should not depend on other companies public leaves.")