[IMP] sale_payment_sheet: add more tests

sale_payment_sheet/tests/test_sale_payment_sheet.py

@@ -46,7 +46,8 @@ def setUpClass(cls):
         )
         cls.invoice1 = cls._create_invoice(cls)
         cls.invoice2 = cls._create_invoice(cls)
-        (cls.invoice1 + cls.invoice2).action_post()
+        cls.refund1 = cls._create_refund(cls)
+        (cls.invoice1 + cls.invoice2 + cls.refund1).action_post()
 
     def _create_invoice(self):
         with Form(
@@ -60,6 +61,18 @@ def _create_invoice(self):
                 line_form.price_unit = 100.00
         return invoice_form.save()
 
+    def _create_refund(self):
+        with Form(
+            self.env["account.move"].with_context(default_move_type="out_refund")
+        ) as invoice_form:
+            invoice_form.partner_id = self.partner
+            with invoice_form.invoice_line_ids.new() as line_form:
+                line_form.name = "invoice test"
+                line_form.account_id = self.account_invoice
+                line_form.quantity = 1.0
+                line_form.price_unit = 100.00
+        return invoice_form.save()
+
     def test_payment_wizard(self):
         PaymentWiz = self.env["sale.invoice.payment.wiz"].with_context(
             active_model="account.move",
@@ -146,6 +159,8 @@ def test_payment_sheet_reopen(self):
         self.assertFalse(sheet.statement_id)
 
     def test_payment_sheet_unlink(self):
+        sheet = self._create_payment_sheet()
+        sheet.unlink()
         sheet = self._create_payment_sheet()
         sheet.button_confirm_sheet()
         with self.assertRaises(UserError):