You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: client_tests.rs
    path of file: ./repos/sdk-core/tests/integ_tests
    
    the code of the file until where you have to start completion: use std::time::Duration;
use temporal_client::{RetryClient, WorkflowClientTrait, WorkflowService};
use temporal_sdk_core_protos::temporal::api::workflowservice::v1::DescribeNamespaceRequest;
use temporal_sdk_core_test_utils::{get_integ_server_options, CoreWfStarter, NAMESPACE};

#[tokio::test]
asy
    
async fn can_use_retry_raw_client() {
    let opts = get_integ_server_options();
    let raw_client = opts.connect_no_namespace(None).await.unwrap();
    let mut retry_client = RetryClient::new(raw_client, opts.retry_config);
    retry_client
        .describe_namespace(DescribeNamespaceRequest {
            namespace: NAMESPACE.to_string(),
            ..Default::default()
        })
        .await
        .unwrap();
}