Rusoto uses the log logging facade. For tests, Rusoto uses env_logger.

In order to see logging output (e.g. the actual requests made to AWS), env_logger needs to be initialized:

fn list_objects_test() {
    let _ = env_logger::try_init(); // This initializes the `env_logger`

    let bare_s3 = S3Client::new(Region::UsWest2);

    let mut list_request = ListObjectsRequest::default();
    list_request.bucket = "rusototester".to_string();
    let result = bare_s3.list_objects(list_request).sync().unwrap();
    println!("result is {:?}", result);

To see the output of logging from integration tests, the command needs to be run as follows:

RUST_LOG=rusoto,hyper=debug cargo test --features all

To get the logging output as well as the output of any println! statements, run:

RUST_LOG=rusoto,hyper=debug cargo test --features all -- --nocapture

If more debugging is required, all debug info including details from the compiler can be seen by setting RUST_LOG to debug. This will be noisy but will give a lot of debug information. For example:

RUST_LOG=debug cargo test --features all

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