MSTest parallel output demo

UnitTest1.cs

using System.Diagnostics;
using Microsoft.VisualStudio.TestTools.UnitTesting;

[assembly: Parallelize(Workers = 0, Scope = ExecutionScope.MethodLevel)]

namespace mstest;

[TestClass]
public class UnitTest1
{
    static bool Flag1 = false;
    static bool Flag2 = false;
    static bool Flag3 = false;


    [TestMethod]
    public void TestMethod1()
    {
        Console.WriteLine("TestMethod1");
        Flag1 = true;
        while (!Flag2) { }
        Console.WriteLine("TestMethod1");
        while (!Flag3) { }
        Console.WriteLine("TestMethod1");

        Console.Error.WriteLine("ERRRRRR!");

        Trace.WriteLine("Tracing");
        Debug.WriteLine("Debugging");
    }

    [TestMethod]
    public void TestMethod2()
    {
        Console.WriteLine("TestMethod2");
        while (!Flag1) { }
        Console.WriteLine("TestMethod2");
        Flag2 = true;
        while (!Flag3) { }
        Console.WriteLine("TestMethod2");
    }

    [TestMethod]
    public async Task TestMethod3()
    {
        Console.WriteLine("TestMethod3");
        while (!Flag1) { }
        Console.WriteLine("TestMethod3");
        while (!Flag2) { }

        FastChildMethod();
        await SlowChildMethod();

        Flag3 = true;
        Console.WriteLine("TestMethod3");
    }

    public async Task SlowChildMethod()
    {
        await Task.Delay(1000);
        Console.WriteLine("I am slow!");
    }

    public async Task FastChildMethod()
    {
        await Task.Delay(100);
        Console.WriteLine("I am fast!");
    }
}