Test showing parallel async tasks

AsyncTest.cs

using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.VisualStudio.TestTools.UnitTesting;
    
namespace Tests
{
    [TestClass]
    public class AsyncTest
    {
        [TestMethod]
        public async Task Test()
        {
            var sw = new Stopwatch();
            sw.Start();

            var results = await this.GetFoosAndDoSomethingAsync();

            sw.Stop();

            foreach (var foo in results) Debug.WriteLine(foo.X);

            Debug.WriteLine(sw.ElapsedMilliseconds);
        }

        public async Task<IList<Foo>> GetFoosAndDoSomethingAsync()
        {
            var foos = Enumerable.Range(0, 10).Select(x => new Foo(x));

            var tasks = foos.Select(async foo => await DoSomethingAsync(foo)); //.ToList();

            return await Task.WhenAll(tasks);
        }

        private async Task<Foo> DoSomethingAsync(Foo foo)
        {
            await Task.Delay(1000);
            return foo;
        }
    }

    public class Foo
    {
        public Foo(int x)
        {
            X = x;
        }

        public int X { get; set; }
    }
}