Configure MSTest

MSTest, Microsoft Testing Framework, is a test framework for .NET applications. It allows you to write and execute tests, and provide test suites with integration to Visual Studio and Visual Studio Code Test Explorers, the .NET CLI, and many CI pipelines.

MSTest is a fully supported, open-source and a cross-platform test framework that works with all supported .NET targets (.NET Framework, .NET Core, .NET, UWP, WinUI, and so on) hosted on GitHub.

Runsettings

A .runsettings file can be used to configure how unit tests are being run. To learn more about the runsettings and the configurations related to the platform, you can check out VSTest runsettings documentation or MSTest runner runsettings documentation.

MSTest element

The following runsettings entries let you configure how MSTest behaves.

Configuration	Default	Values
AssemblyCleanupTimeout	0	Specify globally the timeout to apply on each instance of assembly cleanup method. [Timeout] attribute specified on the assembly cleanup method overrides the global timeout .
AssemblyInitializeTimeout	0	Specify globally the timeout to apply on each instance of assembly initialize method. [Timeout] attribute specified on the assembly initialize method overrides the global timeout .
AssemblyResolution	false	You can specify paths to extra assemblies when finding and running unit tests. For example, use these paths for dependency assemblies that aren't in the same directory as the test assembly. To specify a path, use a Directory Path element. Paths can include environment variables. <AssemblyResolution> <Directory path="D:\myfolder\bin\" includeSubDirectories="false"/> </AssemblyResolution> This feature is only applied when using a .NET Framework target.
CaptureTraceOutput	true	Capture text messages coming from the Console.Write*, Trace.Write*, and Debug.Write* APIs that will be associated to the current running test.
ClassCleanupLifecycle	EndOfClass	If you want the class cleanup to occur at the end of assembly, set it to EndOfAssembly. (No longer supported starting from MSTest v4 as EndOfClass is the default and only ClassCleanup behavior)
ClassCleanupTimeout	0	Specify globally the timeout to apply on each instance of class cleanup method. [Timeout] attribute specified on the class cleanup method overrides the global timeout.
ClassInitializeTimeout	0	Specify globally the timeout to apply on each instance of class initialize method. [Timeout] attribute specified on the class initialize method overrides the global timeout.
DeleteDeploymentDirectoryAfterTestRunIsComplete	true	To retain the deployment directory after a test run, set this value to false.
DeploymentEnabled	true	If you set the value to false, deployment items that you specify in your test method aren't copied to the deployment directory.
DeployTestSourceDependencies	true	A value indicating whether the test source references are to be deployed.
EnableBaseClassTestMethodsFromOtherAssemblies	true	A value indicating whether to enable discovery of test methods from base classes in a different assembly from the inheriting test class.
ForcedLegacyMode	false	In older versions of Visual Studio, the MSTest adapter was optimized to make it faster and more scalable. Some behavior, such as the order in which tests are run, might not be exactly as it was in previous editions of Visual Studio. Set the value to true to use the older test adapter. For example, you might use this setting if you have an app.config file specified for a unit test. We recommend that you consider refactoring your tests to allow you to use the newer adapter.
MapInconclusiveToFailed	false	If a test completes with an inconclusive status, it's mapped to the skipped status in Test Explorer. If you want inconclusive tests to be shown as failed, set the value to true.
MapNotRunnableToFailed	true	A value indicating whether a not runnable result is mapped to failed test.
Parallelize		Used to set the parallelization settings: Workers: The number of threads/workers to be used for parallelization, which is by default the number of processors on the current machine. SCOPE: The scope of parallelization. You can set it to MethodLevel. By default, it's ClassLevel. <Parallelize><Workers>32</Workers><Scope>MethodLevel</Scope></Parallelize>
SettingsFile		You can specify a test settings file to use with the MSTest adapter here. You can also specify a test settings file from the settings menu. If you specify this value, you must also set the ForcedLegacyMode to true. <ForcedLegacyMode>true</ForcedLegacyMode>
TestCleanupTimeout	0	Specify globally the timeout to apply on each instance of test cleanup method. [Timeout] attribute specified on the test cleanup method overrides the global timeout.
TestInitializeTimeout	0	Specify globally the timeout to apply on each instance of test initialize method. [Timeout] attribute specified on the test initialize method overrides the global timeout.
TestTimeout	0	Gets specified global test case timeout.
TreatClassAndAssemblyCleanupWarningsAsErrors	false	To see your failures in class cleanups as errors, set this value to true.
TreatDiscoveryWarningsAsErrors	false	To report test discovery warnings as errors, set this value to true.

TestRunParameter element

<TestRunParameters>
    <Parameter name="webAppUrl" value="http://localhost" />
</TestRunParameters>

Test run parameters provide a way to define variables and values that are available to the tests at run time. Access the parameters using the MSTest TestContext.Properties property:

private string _appUrl;
public TestContext TestContext { get; set; }

[TestMethod]
public void HomePageTest()
{
    string _appUrl = TestContext.Properties["webAppUrl"];
}

To use test run parameters, add a public TestContext property to your test class.

Example .runsettings file

The following XML shows the contents of a typical .runsettings file. Copy this code and edit it to suit your needs.

Each element of the file is optional because it has a default value.

<?xml version="1.0" encoding="utf-8"?>
<RunSettings>

  <!-- Parameters used by tests at run time -->
  <TestRunParameters>
    <Parameter name="webAppUrl" value="http://localhost" />
    <Parameter name="webAppUserName" value="Admin" />
    <Parameter name="webAppPassword" value="Password" />
  </TestRunParameters>

  <!-- MSTest -->
  <MSTest>
    <MapInconclusiveToFailed>True</MapInconclusiveToFailed>
    <CaptureTraceOutput>false</CaptureTraceOutput>
    <DeleteDeploymentDirectoryAfterTestRunIsComplete>False</DeleteDeploymentDirectoryAfterTestRunIsComplete>
    <DeploymentEnabled>False</DeploymentEnabled>
    <AssemblyResolution>
      <Directory path="D:\myfolder\bin\" includeSubDirectories="false"/>
    </AssemblyResolution>
  </MSTest>

</RunSettings>