Балерина тестовый макет

Я недавно начал изучать балерину не может издеваться над graphql: Client. репо и пр: https://github.com/zero-hack-org/module-zerohack-github/pull/1

@test:Config {
    dataProvider: testExecuteDataProvider
}
function testExecute(string query) returns error? {
    GraphQlClient|error graphqlClient = new;

    if graphqlClient is error {
        test:assertFail("Unexpected: GraphQlClient is error");
    }
    
    final graphql:Client mockedClient = test:mock(graphql:Client);
    record {|anydata...;|} res = {"username": "test"};
    test:prepare(mockedClient).when("execute").thenReturn(res);
    
    graphql:GenericResponseWithErrors|record {|anydata...;|}|json|graphql:ClientError result = check graphqlClient.execute(query = query);
    if result is graphql:GenericResponseWithErrors {
        test:assertFail("Unexpected: executed response is graphql:GenericResponseWithErrors");
    }
    if result is json {
        test:assertFail("Unexpected: executed response is json");
    }
    if result is graphql:ClientError {
        test:assertFail("Unexpected: executed response is graphql:ClientError");
    }

}

ошибка:

[HttpError из-за неработающего макета] ошибка {ballerina/test:0}ExecutionError ("ошибка {ballerina/graphql:1}HttpError&{ballerina/graphql:1}RequestError&{ballerina/graphql:1}ClientError("Ошибка клиента GraphQL",body = {"message": "Неверные учетные данные","documentation_url":"https://docs.github.com/graphql"})