def validate_grant_type(self, client_id, grant_type, client, request, *args, **kwargs):
        raise NotImplementedError('Subclasses must implement this method.')
Generate a test of (expr) being in (set), where (set) is a subset of (full)
dataset/ETHPy150Open idan/oauthlib/oauthlib/oauth2/rfc6749/request_validator.py/RequestValidator.validate_grant_type--crossover with--dataset/ETHPy150Open smurfix/yapps/yapps/parsetree.py/Generator.in_test