ERP5TypeFunctionalTestCase: make sure activities are not subscribed

Invoking Zuite_waitForActivities when portal_activities is already
subscribed and while another thread from this process is already
executing activities causes infinite "Got a lock error, retrying...".

This situation happens when developer makes a mistake (runs the
tests without unsubscribing activities), so be nice to the developer
so that they don't have to restart Zope.

bt5/erp5_ui_test_core/ExtensionTemplateItem/portal_components/extension.erp5.ERP5Zuite.py

 import itertools
 import time
 from Products.CMFActivity.Activity.Queue import VALIDATION_ERROR_DELAY
+from Products.CMFActivity.ActivityTool import getCurrentNode
 
 def waitForActivities(self, delay=100, count=None):
   """
@@ -9,13 +10,17 @@ def waitForActivities(self, delay=100, count=None):
     RuntimeError is raised in case there is no way
     to finish activities.
   """
+  activity_tool = self.getPortalObject().portal_activities
+  assert not (
+    activity_tool.isSubscribed()
+    and getCurrentNode() in activity_tool.getProcessingNodeList())
+
   if count is not None: # BBB
     # completely arbitrary conversion factor: count used to default to 1000
     # and I (just as arbitrarily) converted that into a 100s default maximum
     # tolerable wait delay before bailing.
     delay = count / 10.
   deadline = time.time() + delay
-  activity_tool = self.getPortalObject().portal_activities
   for call_count in itertools.count():
     x = activity_tool.getMessageList()
     if not x:

product/ERP5Type/tests/ERP5TypeFunctionalTestCase.py

@@ -420,6 +420,9 @@ class ERP5TypeFunctionalTestCase(ERP5TypeTestCase):
     # create browser_id_manager
     if not "browser_id_manager" in self.portal.objectIds():
       self.portal.manage_addProduct['Sessions'].constructBrowserIdManager()
+    # unsubscribe from activities, we'll use Zuite_waitForActivities to
+    # process activities
+    self.portal.portal_activities.unsubscribe()
     self.commit()
     self.setSystemPreference()
     # non-recursive results clean of portal_tests/ or portal_tests/``run_only``