How to convert an existing assembly to a ms unit test assembly?

In Visual Studio 2010 Pro, how can I easily convert a classic assem开发者_JAVA百科bly to a ms unit test assembly ?

It there a flag to activate in the .csproj file ?

The problem is that test projects are "marked" on the project file - you can convert a class library to Test project follow these four simple steps:

1. Unload the project (.prj) file and then open it for update.

2. add the following line to the project
   C#:

   <Project>
    <PropertyGroup>
     <AssemblyName>....</AssemblyName>
     <!-- add this line below -->
     <ProjectTypeGuids>{3AC096D0-A1C2-E12C-1390-A8335801FDAB};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
    </PropertyGroup>
   </Project>
   

   VB - <ProjectTypeGuids>{3AC096D0-A1C2-E12C-1390-A8335801FDAB};{F184B08F-C81C-45F6-A57F- 5ABD9991F28F}</ProjectTypeGuids>

3. Re-load the project back
4. Run you (now working) tests

Note that you'll need to manually add reference to Microsoft.VisualStudio.QualityTools.UnitTestFramework.dll in order to be able to use test related attributes

Update: In the upcoming MSTest V2 this will not be nesessery as MSTest becomes a NuGet package which works just like NUnit/XUnit

In Visual Studio 2017 you can add nuget packages MSTest.TestAdapter and MSTest.TestFramework to your C# project and from then on use [TestClass] with [TestMethod] attributes. They will be automatically discovered and listed in the Test Explorer. A manual added ProjectTypeGuids is not needed to enable tests.

// MyFancyClassTests.cs

namespace MyTests
{
    using Microsoft.VisualStudio.TestTools.UnitTesting;

    [TestClass]
    public class MyFancyClassTest
    {
        private readonly MyFancyClass _MyFancyClass;

        public MyFancyClassTest()
        {
            _MyFancyClass= new MyFancyClass();
        }

        [TestMethod]
        public void MyFancyClass_UninitializedName_ReturnsEmptyString()
        {
            Assert.AreEqual(string.Empty, _MyFancyClass.Name);
        }
    }
}

Unit Test Project is only Class Library which have classes with attribute [TestClass], and .csproj file doesn't have any flags. You can add class to your project and set attribute [TestClass] and it will be test class.