feat(checks) Check for ZopeTestCase tests

If there are ZopeTestCase tests, do not run your own tests.
Throw an exception instead

CHANGES.rst

@@ -6,7 +6,8 @@ Changelog
 
 New:
 
-- *add item here*
+- Check that tests don't run together with ZopeTestCase
+  [do3cc]
 
 Fixes:
 

src/plone/testing/z2.py

@@ -9,6 +9,7 @@
 from Zope2.App.schema import Zope2VocabularyRegistry
 import contextlib
 import os
+import pkg_resources
 
 try:
     from plone.testing._z2_testbrowser import Browser
@@ -22,6 +23,12 @@
 except ImportError:
     HAS_ZOPE213 = False
 
+try:
+    pkg_resources.get_distribution('Zope2')
+    HAS_ZOPETESTCASE = True
+except pkg_resources.DistributionNotFound:
+    HAS_ZOPETESTCASE = False
+
 _INSTALLED_PRODUCTS = {}
 
 
@@ -544,6 +551,14 @@ def setUpDatabase(self):
         the resource stack.
         """
 
+        if HAS_ZOPETESTCASE:
+            from Testing.ZopeTestCase.ZopeLite import _patched as ZOPETESTCASEALERT
+        if HAS_ZOPETESTCASE and ZOPETESTCASEALERT:
+            raise Exception('You try to run plone.testing tests together with '
+                            'ZopeTestCase tests. This will result in random '
+                            'failures. Convert the ZopeTestCase Tests or '
+                            'do not run them together')
+
         import Zope2.Startup.datatypes
         import App.config