Name the namespace used for Microsoft Visual Studio Unit Testing ?

Namespace used for Microsoft Visual Studio Unit Testing -Microsoft.VisualStudio.TestTools.UnitTesting

Example in C# :

using System;
using System.Text;
using System.Collections.Generic;
using System.Linq;
using Microsoft.VisualStudio.TestTools.UnitTesting;
namespace TestProjectMath
{
  
    [TestClass]
    public class UnitTestMath
    {
     }
}