Identifying Code Change Impact on Tests

This topic applies to:

Visual Studio Ultimate

Visual Studio Premium

Visual Studio Professional 

Visual Studio Express

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By using Test Impact Analysis during code development, you can identify the methods in a test project that have been affected by code changes in your managed code solution. At each build of the solution on the local computer, Test Impact Analysis identifies the methods in the code project that have changed and lists the test methods that directly or indirectly call those methods. You can then run the tests from the Test Impact View window. You can also use the Test Impact View window to identify and run any test method that affects a particular code method.


Test Impact Analysis is not supported on obfuscated binaries

Test Impact Analysis can also be used in Microsoft Test Manager, as part of the check-in policies for team projects in Team Foundation Server, and in build definitions for Team Foundation Build. For more information about Test Impact Analysis in different feature areas, see the following Help topics:

Feature Area


Visual Studio IDE

How to: Identify the Test Impact of Code Changes During Development

Microsoft Test Manager

Recommending Tests to Run That are Affected by Code Changes

Check-in policies for team projects

Set and Enforce Quality Gates

Build definitions for Team Foundation Build

Define Your Build Process

The Test Impact View Window

The Test Impact View tool window shows the tests that are affected by changes to your code, the methods in your code that have changed, and the test methods that call a selected function in your code. From the Test Impact View window, you can also run tests to verify code changes.

You control the test impact views and commands from the Test Impact View toolbar.

Command Button


Show Impacted Tests

Displays the test methods that have been affected since the last build of the application. When you select one or more test methods, the Code changes window display only those application methods that impacted the selected test methods.

Show Code Changes

Displays the application methods that have failed one or more tests and have not been verified as passing those tests. When you select one or more application methods, the Impacted tests window display only those test methods that were impacted by the selected application methods.

Show Calling Tests

Displays the test methods that call a selected method in the code editor.

Run / Debug Test

Runs or debugs all or some of the impacted test methods.

Show Team Foundation Server Tests

Includes the tests that are run through Team Foundation Server or Test Manager in the list of impacted and calling tests.


Requires the test impact database for the impacted, code change, and calling test lists.

External Resources


link to videoVisual Studio Developer Center video: How do I get started with Visual Studio 2010 Test Impact Analysis

link to videoVisual Studio Developer Center video: How Do I configure and use Test Impact Analysis

See Also


Setting Up Test Machines to Run Tests or Collect Data

Running Tests

Verifying Code by Using Unit Tests

Completing Development Tasks