public async Task ParallelExceptionsTest()
{
var source = Enumerable.Repeat(true, 20).ToArray();
var barrier = new AsyncBarrier(source.Length);
var task = AsyncParallel.ForEach(
source, async b =>
{
await barrier.SignalAndWaitAsync();
throw new Exception();
});
await task.ContinueWith(t => { Assert.AreEqual(source.Length, t.Exception.InnerExceptions.Count); });
}