[TEST] contract: Add unit test for invoicing multiple contracts with different customers

Author: rlizana

Diff for: contract/tests/test_contract.py

@@ -1745,12 +1745,9 @@ def test_cron_recurring_create_invoice(self):
         )
 
     def test_cron_recurring_create_invoice_several_partners(self):
-        self.acct_line.date_start = "2018-01-01"
-        self.acct_line.recurring_invoicing_type = "post-paid"
-        self.acct_line.date_end = "2018-03-15"
-        other_partner = self.env.ref('base.res_partner_1')
-        contracts = self.contract2
-        contracts |= self.contract.copy({'partner_id': other_partner.id})
+        other_partner = self.env.ref("base.res_partner_1")
+        contracts = self.contract
+        contracts |= self.contract.copy({"invoice_partner_id": other_partner.id})
         self.env["contract.contract"].cron_recurring_create_invoice()
         invoice_lines = self.env["account.move.line"].search(
             [("contract_line_id", "in", contracts.mapped("contract_line_ids").ids)]
@@ -1759,10 +1756,9 @@ def test_cron_recurring_create_invoice_several_partners(self):
             len(contracts.mapped("contract_line_ids")),
             len(invoice_lines),
         )
-        self.assertEqual(len(invoice_lines.mapped('move_id')), 2)
-        self.assertEqual(len(invoice_lines.mapped('move_id.partner_id')), 2)
-        self.assertIn(
-            other_partner, invoice_lines.mapped('move_id.partner_id'))
+        self.assertEqual(len(invoice_lines.mapped("move_id")), 2)
+        self.assertEqual(len(invoice_lines.mapped("move_id.partner_id")), 2)
+        self.assertIn(other_partner, invoice_lines.mapped("move_id.partner_id"))
 
     def test_recurring_create_invoice(self):
         self.acct_line.date_start = "2024-01-01"