MSTest is a command-line tool used for running automated tests in Visual Studio. It is part of the Microsoft Test Framework and is used extensively in the .NET ecosystem to ensure code quality and reliability. MSTest allows developers to write unit tests, integration tests, and other types of automated tests to validate their code. Running MSTest via the Command Prompt (CMD) on Windows is particularly useful for integrating tests into continuous integration (CI) pipelines and for automating the testing process.

Examples:

1. Setting Up MSTest:
Before running MSTest, ensure that you have Visual Studio installed with the necessary components for testing. You can install the MSTest framework via NuGet in your test project.

   dotnet add package MSTest.TestFramework

   dotnet add package MSTest.TestAdapter

2. Creating a Test Project:
Create a new test project in Visual Studio or via the .NET CLI.

   dotnet new mstest -n MyTestProject

   cd MyTestProject

3. Writing a Test:
Add a simple test to the UnitTest1\.cs file in your test project.

   using Microsoft.VisualStudio.TestTools.UnitTesting;



   namespace MyTestProject

   {

       [TestClass]

       public class UnitTest1

       {

           [TestMethod]

           public void TestMethod1()

           {

               Assert.AreEqual(2 + 2, 4);

           }

       }

   }

4. Building the Project:
Build the test project to ensure there are no compilation errors.

   dotnet build

5. Running Tests via CMD:
Navigate to the directory containing your test project's .csproj file and run the following command to execute the tests using MSTest.

   dotnet test

Alternatively, you can use the MSTest executable if you have older test projects that require it.

   MSTest /testcontainer:MyTestProject.dll

6. Viewing Test Results:
After running the tests, the results will be displayed in the Command Prompt. You can also generate a detailed test results file by using the /resultsfile option.

   MSTest /testcontainer:MyTestProject.dll /resultsfile:TestResults.trx