Opentelemetry hang demonstration

Cargo.toml

[package]
name = "opentelem_hang"
version = "0.1.0"
authors = ["Spencer Judge <sjudge@hey.com>"]
edition = "2018"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]
futures = "0.3"
opentelemetry = { version = "0.13", features = ["rt-tokio"] }
opentelemetry-jaeger = "0.12"
tokio = { version = "1.1", features = ["full"] }
tracing = "0.1"
tracing-opentelemetry = "0.12"
tracing-subscriber = "0.2"

main.rs

#[macro_use]
extern crate tracing;

fn main() {
    println!("Hello, world!");
}

#[cfg(test)]
mod tests {
    use opentelemetry::global;
    use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt, EnvFilter};

    #[tokio::test]
    async fn hang_demonstration() {
        let filter_layer = EnvFilter::try_from_default_env()
            .or_else(|_| EnvFilter::try_new("info"))
            .unwrap();
        let pretty_fmt = tracing_subscriber::fmt::format()
            .pretty()
            .with_source_location(false);

        let tracer = opentelemetry_jaeger::new_pipeline()
            .install_batch(opentelemetry::runtime::Tokio)
            .unwrap();

        let opentelemetry = tracing_opentelemetry::layer().with_tracer(tracer);

        tracing_subscriber::registry()
            .with(opentelemetry)
            .with(filter_layer)
            .with(
                tracing_subscriber::fmt::layer()
                    .with_target(false)
                    .event_format(pretty_fmt),
            )
            .try_init()
            .unwrap();

        info!("Hi");

        global::shutdown_tracer_provider(); // sending remaining spans
    }
}