[IMP] product_pricelist_supplierinfo: test for non-supplier-info pric…

…elist

Add a test for the scenario where the pricelist is not based on the
supplier info, ensuring the price is calculated as expected natively.

product_pricelist_supplierinfo/tests/test_product_supplierinfo.py

@@ -327,3 +327,13 @@ def test_pricelist_exclude_supplier_info_discount(self):
             self.pricelist._get_product_price(self.product, 1),
             10,
         )
+
+    def test_pricelist_price_not_based_on_supplierinfo(self):
+        """Test the scenario where the pricelist is not based on the supplier info,
+        so the price should be calculated as expected natively.
+        """
+        self.pricelist.item_ids[0].base = "list_price"
+        self.assertAlmostEqual(
+            self.pricelist._get_product_price(self.product, 1),
+            1,
+        )