testDateUtils: run some original DateTime tests with our patches loaded

This ensures that we don't break more.

bt5/erp5_core_test/TestTemplateItem/portal_components/test.erp5.testDateUtils.py

@@ -309,4 +309,35 @@ def test_suite():
   suite.addTest(unittest.makeSuite(TestPinDateTime))
   suite.addTest(unittest.makeSuite(TestTimeZoneContext))
   suite.addTest(unittest.makeSuite(TestDateTimePatch))
+
+  # also run original tests from DateTime module
+  # pylint:disable=no-name-in-module
+  try:
+    import DateTime.tests.testDateTime as test_datetime
+  except ImportError:
+    from DateTime.tests import test_datetime
+  # pylint:enable=no-name-in-module
+
+  class DateTimeTests(test_datetime.DateTimeTests):
+    testTimezoneNaiveHandling = unittest.expectedFailure(
+      test_datetime.DateTimeTests.testTimezoneNaiveHandling)
+
+    # This test is only in DateTime >= 3
+    if hasattr(test_datetime.DateTimeTests, 'test_intl_format_hyphen'):
+      test_intl_format_hyphen = unittest.expectedFailure(
+        test_datetime.DateTimeTests.test_intl_format_hyphen)
+
+    # These 3 tests are only in DateTime 2
+    if hasattr(test_datetime.DateTimeTests, 'test_pickle_new_with_micros'):
+      test_pickle_new_with_micros = unittest.expectedFailure(
+        test_datetime.DateTimeTests.test_pickle_new_with_micros)
+    if hasattr(test_datetime.DateTimeTests, 'test_pickle_new_with_tz'):
+      test_pickle_new_with_tz = unittest.expectedFailure(
+        test_datetime.DateTimeTests.test_pickle_new_with_tz)
+    if hasattr(test_datetime.DateTimeTests, 'testLegacyTimezones'):
+      testLegacyTimezones = unittest.expectedFailure(
+        test_datetime.DateTimeTests.testLegacyTimezones)
+
+  suite.addTest(unittest.makeSuite(DateTimeTests))
+
   return suite