def METHOD_NAME(self):
    result = self.resource.plural_post()["data"]
    modification = result["last_modified"]
    self.resource = self.resource_class(request=self.get_request(), context=self.get_context())
    self.resource.request.validated = self.validated
    self.resource.plural_get()
    header = int(self.last_response.headers["ETag"][1:-1])
    self.assertEqual(header, modification)