[IMP] crm: add tests for MC computation on lead with partner company

Currently using a customer with a company set on a lead without company
crashes, as it keep a void company on the lead. This is not compatible
with the company set on the partner itself.

OPW-2805181
Task-2888330

X-original-commit: 51be6cab5c4437ef56de5d1b25c0ba8486d25291
Part-of: odoo/odoo#94493

addons/crm/tests/common.py

@@ -296,6 +296,13 @@ class TestCrmCommon(TestSalesCommon, MailCase):
             'user_id': cls.user_sales_manager.id,
         })
 
+        cls.partner_c2 = cls.env['res.partner'].create({
+            'company_id': cls.company_2.id,
+            'email': '"Partner C2" <partner_c2@multicompany.example.com>',
+            'name': 'Customer for C2',
+            'phone': '+32455001122',
+        })
+
     def _create_leads_batch(self, lead_type='lead', count=10, email_dup_count=0,
                             partner_count=0, partner_ids=None, user_ids=None,
                             country_ids=None, probabilities=None, suffix=''):