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: integration.rs
    path of file: ./repos/aws-sdk-rust/sdk/qldbsession/tests
    
    the code of the file until where you have to start completion: /*
 * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
 * SPDX-License-Identifier: Apache-2.0
 */

#![cfg(feature = "test-util")]

use aws_sdk_qldbsession::config::{Config, Credentials, Region};
use aws_sdk_qldbsession::types::StartSessionRequest;
use aws_sdk_qldbsession::Client;
use aws_smithy_runtime::client::http::test_util::{ReplayEvent, StaticReplayClient};
use aws_smithy_types::body::SdkBody;
use http::Uri;

#[cfg(feature = "test-util")]
#[tokio::test]
async fn signv4_use_correct_service_name() {
    let http_client = StaticReplayClient::new(vec![ReplayEvent::new(
        http::Request::builder()
            .header("content-type", "application/x-amz-json-1.0")
            .header("x-amz-target", "QLDBSession.SendCommand")
            .header("content-length", "49")
            .header("authorization", "AWS4-HMAC-SHA256 Credential=ANOTREAL/20090213/us-east-1/qldb/aws4_request, SignedHeaders=con
    
async fn signv4_use_correct_service_name() {
    let http_client = StaticReplayClient::new(vec![ReplayEvent::new(
        http::Request::builder()
            .header("content-type", "application/x-amz-json-1.0")
            .header("x-amz-target", "QLDBSession.SendCommand")
            .header("content-length", "49")
            .header("authorization", "AWS4-HMAC-SHA256 Credential=ANOTREAL/20090213/us-east-1/qldb/aws4_request, SignedHeaders=content-length;content-type;host;x-amz-date;x-amz-target;x-amz-user-agent, Signature=9a07c60550504d015fb9a2b0f1b175a4d906651f9dd4ee44bebb32a802d03815")
            // qldbsession uses the signing name 'qldb' in signature _________________________^^^^
            .header("x-amz-date", "20090213T233130Z")
            .header("user-agent", "aws-sdk-rust/0.123.test os/windows/XPSP3 lang/rust/1.50.0")
            .uri(Uri::from_static("https://session.qldb.us-east-1.amazonaws.com/"))
            .body(SdkBody::from(r#"{"StartSession":{"LedgerName":"not-real-ledger"}}"#)).unwrap(),
        http::Response::builder()
            .status(http::StatusCode::from_u16(200).unwrap())
            .body(SdkBody::from(r#"{}"#)).unwrap()),
    ]);
    let conf = Config::builder()
        .http_client(http_client.clone())
        .region(Region::new("us-east-1"))
        .credentials_provider(Credentials::for_tests_with_session_token())
        .with_test_defaults()
        .build();
    let client = Client::from_conf(conf);

    let _ = client
        .send_command()
        .start_session(
            StartSessionRequest::builder()
                .ledger_name("not-real-ledger")
                .build()
                .unwrap(),
        )
        .customize()
        .mutate_request(|req| {
            // Remove the invocation ID since the signed request above doesn't have it
            req.headers_mut().remove("amz-sdk-invocation-id");
        })
        .send()
        .await
        .expect("request should succeed");

    http_client.assert_requests_match(&[]);
}