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: reader.rs
    path of file: ./repos/tremor-runtime/src/connectors/tests/s3
    
    the code of the file until where you have to start completion: // Copyright 2022, The Tremor Team
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may n
    
async fn connector_s3_no_connection() -> Result<()> {
    let _: std::result::Result<_, _> = env_logger::try_init();
    let bucket_name = random_bucket_name("no-connection");
    let mut env = EnvHelper::new();
    env.set_var("AWS_ACCESS_KEY_ID", MINIO_ROOT_USER);
    env.set_var("AWS_SECRET_ACCESS_KEY", MINIO_ROOT_PASSWORD);
    let connector_yaml = literal!({
        "codec": "binary",
        "config":{
            "aws_region": MINIO_REGION,
            "bucket": bucket_name.clone(),
            "url": "http://localhost:9090",
            "path_style_access": true, // required by minio
        }
    });

    let harness = ConnectorHarness::new(
        function_name!(),
        &s3::reader::Builder::default(),
        &connector_yaml,
    )
    .await?;
    assert!(harness.start().await.is_err());
    Ok(())
}