Testing tools in Visual Studio

Visual Studio testing tools can help you and your team develop and sustain high standards of code excellence.


Unit testing is available in all editions of Visual Studio. Other testing tools, such as Live Unit Testing, IntelliTest, and Coded UI Test, are only available in Visual Studio Enterprise edition. For more information about editions see Compare Visual Studio IDEs.

Test Explorer

The Test Explorer window helps developers create, manage, and run unit tests. You can use the Microsoft unit test framework or one of several third-party and open source frameworks.

Visual Studio Test Explorer

Visual Studio is also extensible and opens the door for third-party unit testing adapters such as NUnit and xUnit.net. In addition, the code clone capability goes hand-in-hand with delivering high-quality software by helping you identify blocks of semantically similar code that may be candidates for common bug fixes or refactoring.

Third-party test integration

Live Unit Testing

Live Unit Testing automatically runs unit tests in the background, and graphically displays code coverage and test results in the Visual Studio code editor.


IntelliTest automatically generates unit tests and test data for your managed code. IntelliTest improves coverage and dramatically reduces the effort to create and maintain unit tests for new or existing code.

IntelliTest in action

Code coverage

Code coverage determines what proportion of your project's code is actually being tested by coded tests such as unit tests. To guard effectively against bugs, your tests should exercise or "cover" a large proportion of your code.

Code coverage analysis can be applied to both managed and unmanaged (native) code.

Code coverage is an option when you run test methods using Test Explorer. The results table shows the percentage of the code that was run in each assembly, class, and method. In addition, the source editor shows you which code has been tested.

Microsoft Fakes

Microsoft Fakes help you isolate the code you're testing by replacing other parts of the application with stubs or shims.

User interface testing with Coded UI and Selenium

Coded UI tests provide a way to create fully automated tests to validate the functionality and behavior of your application’s user interface. They can automate UI testing across a variety of technologies, including XAML-based UWP apps, browser apps, and SharePoint apps.

Whether you choose best-of-breed Coded UI Tests or generic browser-based UI testing with Selenium, Visual Studio provides all the tools you need.

UI testing with coded UI

Load testing

Load testing simulates load on a server application by running unit tests and web performance tests.