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Ran https://github.com/python/cpython/blob/3.7/Lib/lib2to3/fixes/fix_asserts.py after adding the missing methods (assertRegex and assertRaisesRegex) on ERP5TypeTestCase.
Also ran a custom fixer rewriting
self.assertTrue(a in b)
into
self.assertIn(a, b)
This will create a new commit in order to revert the existing changes.