Async version of https://github.com/jimmycuadra/rust-etcd/blob/9635f3c123e5b9864a9b314b8d70360b981732d2/tests/client_test.rs#L100

create_in_order.rs

#[test]
fn create_in_order() {
    let core = Core::new().unwrap();
    let mut client = TestClient::new(core);

    let requests: Vec<FutureKeySpaceInfo> = (1..4).map(|_| {
        kv::create_in_order( &client, "/test/foo", "bar", None)
    }).collect();

    let work = join_all(requests).and_then(|mut ksis: Vec<KeySpaceInfo>| {
        ksis.sort_by_key(|ksi| ksi.node.as_ref().unwrap().modified_index.unwrap());

        let keys: Vec<String> = ksis
            .into_iter()
            .map(|ksi| ksi.node.unwrap().key.unwrap())
            .collect();

        assert!(keys[0] < keys[1]);
        assert!(keys[1] < keys[2]);

        Ok(())
    });

    assert!(client.run(work).is_ok());
}