Show purchase PnL graph values

modules/purchase_trade/tests/test_module.py

@@ -5304,6 +5304,12 @@ class PurchaseTradeTestCase(ModuleTestCase):
         self.assertEqual(graph_field.get('labels'), 'pnl:Pnl,mtm:Mtm')
         self.assertEqual(graph_field.get('hidden_series'), 'pnl_graph')
 
+        value_fields = pages[pnl_index + 1].findall("field[@name='pnl_graph']")
+        self.assertEqual(value_fields[1].get('mode'), 'tree')
+        self.assertEqual(
+            value_fields[1].get('view_ids'),
+            'purchase_trade.purchase_pnl_graph_view_tree')
+
     def test_shipment_in_pnl_lines_use_physical_and_open_lots(self):
         'shipment PnL uses valuation lines from physical and open lot links'
         ShipmentIn = Pool().get('stock.shipment.in')