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: status.rs
    path of file: ./repos/tonic/tests/integration_tests/tests
    
    the code of the file until where you have to start completion: use bytes::Bytes;
use http::Uri;
use integration_tests::mock::MockStream;
use integration_tests::pb::{
    test_client, test_server, test_stream_client, test_stream_server, Input, InputStream, Output,
    OutputStream,
};
use std::error::Error;
use std::time::Duration;
use tokio::sync::oneshot;
use tonic::metadata::{MetadataMap, MetadataValue};
use tonic::transport::Endpoint;
use tonic::{transport::Server, Code, Reques
    
async fn status_from_server_stream_with_source() {
    integration_tests::trace_init();

    let channel = Endpoint::try_from("http://[::]:50051")
        .unwrap()
        .connect_with_connector_lazy(tower::service_fn(move |_: Uri| async move {
            Err::<MockStream, _>(std::io::Error::new(std::io::ErrorKind::Other, "WTF"))
        }));

    let mut client = test_stream_client::TestStreamClient::new(channel);

    let error = client.stream_call(InputStream {}).await.unwrap_err();

    let source = error.source().unwrap();
    source.downcast_ref::<tonic::transport::Error>().unwrap();
}