def testOneofClear(self, message_module):
    m = message_module.TestAllTypes()
    m.oneof_uint32 = 11
    m.Clear()
    self.assertIsNone(m.WhichOneof('oneof_field'))
    m.oneof_bytes = b'bb'
    self.assertEqual('oneof_bytes', m.WhichOneof('oneof_field'))