erp5_wendelin_inventory: Add a workaround to load ExternalMethod for test node.

bt5/erp5_wendelin_inventory/TestTemplateItem/portal_components/test.erp5.testPandasInventory.py

@@ -26,6 +26,7 @@
 ##############################################################################
 
 from Products.ERP5Type.tests.ERP5TypeTestCase import ERP5TypeTestCase
+from erp5.component.extension import PandasInventory
 import transaction
 
 class PandasInventoryTest(ERP5TypeTestCase):

bt5/erp5_wendelin_inventory/TestTemplateItem/portal_components/test.erp5.testPandasInventory.xml

@@ -45,7 +45,9 @@
         <item>
             <key> <string>text_content_warning_message</string> </key>
             <value>
-              <tuple/>
+              <tuple>
+                <string>W: 29,  0: Unused PandasInventory imported from erp5.component.extension (unused-import)</string>
+              </tuple>
             </value>
         </item>
         <item>