ERP5: "quick and dirty" type annotations XXX

IIRC the only thing needed is that ERP5TypeTestCase.getPortal is an
ERP5Site

product/ERP5Type/Core/Folder.py

@@ -53,6 +53,11 @@ from Products.ERP5Type.Utils import sortValueList
 from Products.ERP5Type import Permissions
 from Products.ERP5Type.Globals import InitializeClass
 from Products.ERP5Type.Accessor import Base as BaseAccessor
+try:
+  from typing import List
+except ImportError:
+  pass
+
 try:
   from Products.CMFCore.CMFBTreeFolder import CMFBTreeFolder
 except ImportError:
@@ -202,6 +207,7 @@ class FolderMixIn(ExtensionClass.Base):
   security.declarePublic('newContent')
   def newContent(self, id=None, portal_type=None, id_group=None,
           default=None, method=None, container=None, temp_object=0, **kw):
+    # type: (...) -> Folder
     """Creates a new content.
     This method is public, since TypeInformation.constructInstance will perform
     the security check.
@@ -417,6 +423,7 @@ class FolderMixIn(ExtensionClass.Base):
   # Get the content
   security.declareProtected(Permissions.AccessContentsInformation, 'searchFolder')
   def searchFolder(self, **kw):
+    # type: (str) -> List[Folder]
     """
       Search the content of a folder by calling
       the portal_catalog.
@@ -1513,6 +1520,7 @@ class Folder(FolderMixIn, CopyContainer, ObjectManager, Base, OFSFolder2, CMFBTr
   def objectValues(self, spec=None, meta_type=None, portal_type=None,
                    sort_on=None, sort_order=None, checked_permission=None,
                    **kw):
+    # type: () -> List[Folder]
     # Returns list of objects contained in this folder.
     #  (no docstring to prevent publishing)
     if meta_type is not None:
@@ -1545,6 +1553,7 @@ class Folder(FolderMixIn, CopyContainer, ObjectManager, Base, OFSFolder2, CMFBTr
   security.declareProtected( Permissions.AccessContentsInformation,
                              'contentValues' )
   def contentValues(self, *args, **kw):
+    # type: () -> List[Folder]
     # Returns a list of documents contained in this folder.
     # ( no docstring to prevent publishing )
     portal_type_id_list = self._getTypesTool().listContentTypes()

product/ERP5Type/tests/ERP5TypeTestCase.py

@@ -214,6 +214,13 @@ def _parse_args(self, *args, **kw):
 _parse_args._original = DateTime._original_parse_args
 DateTime._parse_args = _parse_args
 
+
+try:
+    from erp5.portal_type import ERP5Site as erp5_portal_type_ERP5Site
+except ImportError:
+    pass
+
+
 class ERP5TypeTestCaseMixin(ProcessingNodeTestCase, PortalTestCase):
     """Mixin class for ERP5 based tests.
     """
@@ -936,6 +943,7 @@ class ERP5TypeCommandLineTestCase(ERP5TypeTestCaseMixin):
       return portal_name + '_' + m.hexdigest()
 
     def getPortal(self):
+      # type: () -> erp5_portal_type_ERP5Site
       """Returns the portal object, i.e. the "fixture root".
 
       It also does some initialization, as if the portal was accessed for the