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Verifying Code by Using Unit Tests

The Visual Studio 2012 unit test tools are designed to support developers and teams who incorporate unit testing in their software development practices. Unit tests give developers and testers a quick way to look for logic errors in the methods of classes in Visual C#, Visual Basic, and Visual C++ projects.

The unit test tools include:

  1. Test Explorer. Test Explorer lets you run unit tests and view their results. Test Explorer can use any unit test framework, including a third-party framework, that has an adapter for the Explorer.

  2. Microsoft unit test framework for managed code. The Microsoft unit test framework for managed code is installed with Visual Studio and provides a framework for testing .NET code.

  3. Microsoft unit test framework for C++. The Microsoft unit test framework for C++ is installed with Visual Studio and provides a framework for testing native code.

  4. Code coverage tools. You can determine the amount of product code that your unit tests exercise from one command in Test Explorer.

  5. Microsoft Fakes isolation framework. The Microsoft Fakes isolation framework can create substitute classes and methods for production and system code that create dependencies in the code under test. By implementing the fake delegates for a function, you control the behavior and output of the dependency object.

Note Note

Not all unit test features are available in all editions of Visual Studio. Requirements are listed in the topics for the features.

For information about using unit tests in Visual Studio Express 2012 for Windows 8, see Creating and running unit tests on a Windows Store app in the Windows Dev Center.

Use the following topics to help with understanding and creating unit tests:

Tasks

Associated Topics

Quick starts and walkthroughs: Use the following topics to learn unit testing in Visual Studio from code examples.

Unit testing with Test Explorer: Learn how Test Explorer can help create more productive and efficient unit tests.

Unit testing managed code:

Unit testing C++ code

Isolating unit tests

Use code coverage to identify what proportion of your project's code is being tested using unit tests: Learn about the code coverage feature of Visual Studio Application Lifecycle Management testing tools.

Perform stress and performance analysis by using load tests for your unit tests: You can create a load test and add your unit tests to it to help isolate performance and stress issues in your application.

Note Note

Creating and using load tests requires Visual Studio Ultimate.

Set and enforce quality gates: You can create quality gates to enforce that tests are run before code is checked in to help ensure the quality of the code.

Extend the unit test type: You can add functionality to your tests that might not be in the Unit Test Framework. For example, you can add a test property that specifies if a test should run as a normal user or not. Or you can extend the framework to add row attributes to a method and use the data in that row inside the test.

For sample code of how to extend the unit test framework, see the following Microsoft Web site.

Set testing options: For example, you can specify where test results are stored.

Configuring Unit Tests by using a .runsettings File

Reviewing Test Results in Microsoft Test Manager

Describes test results and ways to work with them, including how to view, save, and delete them.

Running System Tests Using Microsoft Visual Studio

Provides links to information about using Visual Studio as opposed to using Microsoft Test Manager to run automated tests.

Microsoft.VisualStudio.TestTools.UnitTesting

Describes the UnitTesting namespace, which provides attributes, exceptions, asserts, and other classes that support unit testing.

Microsoft.VisualStudio.TestTools.UnitTesting.Web

Describes the UnitTesting.Web namespace, which extends the UnitTesting namespace by providing support for ASP.NET and Web service unit tests. 

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