async-iter-ext 0.3.0

Async iterator methods and async methods for option and result.
Documentation 
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use std::time::Duration;

use async_iter_ext::{AsyncIterTools, iter::process_result::ProcessResultsStrategy};
use async_std::task::sleep;
use rstest::rstest;

#[rstest]
async fn test_process_results_default_strategy_only_success() {
    let items = [1, 2, 3, 4];

    let res = items
        .into_iter()
        .map_async(|item| async move {
            sleep(Duration::from_millis(100)).await;
            Ok(item * 2)
        })
        .process_results::<_, &str>()
        .await;

    assert!(res.errors().is_empty());
    assert_eq!(res.into_successes(), vec![2, 4, 6, 8]);
}

#[rstest]
async fn test_process_results_default_strategy_success_and_errors() {
    let items = [1, 2, 3, 4];

    let res = items
        .into_iter()
        .map_async(|item| async move {
            sleep(Duration::from_millis(100)).await;
            if item > 2 {
                Err("Item was greater than 2")
            } else {
                Ok(item * 2)
            }
        })
        .process_results::<_, &str>()
        .await;

    assert_eq!(res.clone().into_successes(), vec![2, 4]);
    assert_eq!(
        res.clone().into_errors(),
        vec!["Item was greater than 2", "Item was greater than 2"]
    );
}

#[rstest]
async fn test_process_results_break_on_error_strategy_only_success() {
    let items = [1, 2, 3, 4];

    let res = items
        .into_iter()
        .map_async(|item| async move {
            sleep(Duration::from_millis(100)).await;
            Ok(item * 2)
        })
        .process_results::<_, &str>()
        .with_process_strategy(ProcessResultsStrategy::BreakOnError)
        .await;

    assert!(res.errors().is_empty());
    assert_eq!(res.into_successes(), vec![2, 4, 6, 8]);
}

#[rstest]
async fn test_process_results_break_on_error_strategy_success_and_errors() {
    let items = [1, 2, 3, 4];

    let res = items
        .into_iter()
        .map_async(|item| async move {
            sleep(Duration::from_millis(100)).await;
            if item > 2 {
                Err("Item was greater than 2")
            } else {
                Ok(item * 2)
            }
        })
        .process_results::<_, &str>()
        .with_process_strategy(ProcessResultsStrategy::BreakOnError)
        .await;

    assert!(res.is_empty());
    assert_eq!(res.into_errors(), vec!["Item was greater than 2"]);
}

#[rstest]
async fn test_process_results_break_on_error_strategy_only_success_into_result() {
    let items = [1, 2, 3, 4];

    let res = items
        .into_iter()
        .map_async(|item| async move {
            sleep(Duration::from_millis(100)).await;
            Ok(item * 2)
        })
        .process_results::<_, &str>()
        .with_process_strategy(ProcessResultsStrategy::BreakOnError)
        .await
        .into_result();

    assert!(res.is_ok_and(|items| items == vec![2, 4, 6, 8]));
}

#[rstest]
async fn test_process_results_break_on_error_strategy_success_and_errors_into_result() {
    let items = [1, 2, 3, 4];

    let res = items
        .into_iter()
        .map_async(|item| async move {
            sleep(Duration::from_millis(100)).await;
            if item > 2 {
                Err("Item was greater than 2")
            } else {
                Ok(item * 2)
            }
        })
        .process_results::<_, &str>()
        .with_process_strategy(ProcessResultsStrategy::BreakOnError)
        .await
        .into_result();

    assert!(res.is_err_and(|err| err == "Item was greater than 2"));
}