runUnitTest: show "default" warnings when running tests

By default, DeprecationWarning and PendingDeprecationWarning, and
ImportWarning are ignored, we want to see those while running tests, so
we reset the warnings module to use "default" behavior for all warnings.

https://docs.python.org/3/library/warnings.html#default-warning-filter
https://docs.python.org/2.7/library/warnings.html#updating-code-for-new-versions-of-python

This also implements the recommendation from
https://docs.python.org/3/library/warnings.html#overriding-the-default-filter

> Developers of test runners for Python code are advised to instead
> ensure that all warnings are displayed by default for the code under
> test, using code like:

    import sys

    if not sys.warnoptions:
        import os, warnings
        warnings.simplefilter("default") # Change the filter in this process
        os.environ["PYTHONWARNINGS"] = "default" # Also affect subprocesses

This also extend the "Run Live Test" action to allow controlling the
warnings filter, but on python2 this does not work so well, once a
warning was ignored, later switching to "always" or "error" does not
process the warning again ( it might be because of
 https://bugs.python.org/issue4180 )

product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/ComponentTool_viewLiveTestDialog.xml

@@ -110,6 +110,7 @@
                       <list>
                         <string>your_debug</string>
                         <string>your_verbose</string>
+                        <string>your_warnings</string>
                       </list>
                     </value>
                 </item>

product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/ComponentTool_viewLiveTestDialog/live_test_gadget.xml

@@ -148,7 +148,7 @@
       <dictionary>
         <item>
             <key> <string>_text</string> </key>
-            <value> <string>python: {\'run_test_url\': here.absolute_url() + \'/runLiveTest\', \'read_test_url\': here.absolute_url() + \'/readTestOutput\', \'test_list\': here.REQUEST.get(\'field_your_test\', \'\'), \'run_only\': here.REQUEST.get(\'field_your_run_only\', \'\'), \'debug\': int(here.REQUEST.get(\'field_your_debug\', \'\') == \'on\'), \'verbose\': int(here.REQUEST.get(\'field_your_verbose\', \'\') == \'on\')}</string> </value>
+            <value> <string>python: {\'run_test_url\': here.absolute_url() + \'/runLiveTest\', \'read_test_url\': here.absolute_url() + \'/readTestOutput\', \'test_list\': here.REQUEST.get(\'field_your_test\', \'\'), \'run_only\': here.REQUEST.get(\'field_your_run_only\', \'\'), \'debug\': int(here.REQUEST.get(\'field_your_debug\', \'\') == \'on\'), \'verbose\': int(here.REQUEST.get(\'field_your_verbose\', \'\') == \'on\'), \'warnings\': request.get(\'field_your_warnings\')}</string> </value>
         </item>
       </dictionary>
     </pickle>

product/ERP5Type/Tool/ComponentTool.py

@@ -275,7 +275,7 @@ class Test(ERP5TypeTestCase):
 
   security.declareProtected(Permissions.ManagePortal, 'runLiveTest')
   def runLiveTest(self, test_list=None, run_only=None, debug=False,
-                  verbose=False):
+                  verbose=False, warnings='default'):
     """
     Launch live tests
 
@@ -315,7 +315,8 @@ class Test(ERP5TypeTestCase):
                              debug=debug,
                              stream=global_stream,
                              request_server_url=request_server_url,
-                             verbosity=verbosity)
+                             verbosity=verbosity,
+                             warnings=warnings)
       except ImportError:
         import traceback
         traceback.print_exc(file=global_stream)

product/ERP5Type/tests/ERP5TypeLiveTestCase.py

@@ -31,6 +31,7 @@ import os
 import sys
 import imp
 import re
+import warnings
 
 from zope.site.hooks import setSite
 from zope.globalrequest import getRequest
@@ -297,6 +298,9 @@ def runLiveTest(test_list, verbosity=1, stream=None, request_server_url=None, **
   output.write("**Running Live Test:\n")
   ZopeTestCase._print = output.write
 
+  with warnings.catch_warnings():
+    warnings.simplefilter(kw['warnings'])
+
     # Test may login/logout with different users, so ensure that at the end the
     # original SecurityManager is restored
     from AccessControl.SecurityManagement import getSecurityManager, setSecurityManager

product/ERP5Type/tests/runUnitTest.py

@@ -11,6 +11,7 @@ import shutil
 import errno
 import random
 import transaction
+import warnings
 from glob import glob
 
 
@@ -495,6 +496,13 @@ class DebugTestResult:
 
 _print = sys.stderr.write
 
+
+def setupWarnings():
+  if not sys.warnoptions:
+    warnings.simplefilter("default")
+    os.environ["PYTHONWARNINGS"] = "default"
+
+
 def runUnitTestList(test_list, verbosity=1, debug=0, run_only=None):
   if "zeo_client" in os.environ and "zeo_server" in os.environ:
     _print("conflicting options: --zeo_client and --zeo_server\n")
@@ -898,6 +906,8 @@ def main(argument_list=None):
     elif opt == "--with_wendelin_core":
       os.environ["with_wendelin_core"] = "1"
 
+  setupWarnings()
+
   bt5_path_list += filter(None,
     os.environ.get("erp5_tests_bt5_path", "").split(','))
   valid_path_list = []