Threading Models

TAEF provides functionality for pre-configuring a COM threading model for the environment where you test execute. By default, Managed ©#) and Script tests run on STA thread; for Native, threading model is not pre-configured.

The "ThreadingModel" metadata property is used to request a threading model. The supported values for this property are:

Property Value Description
STA Single-Threaded Apartment (CoInitializeEx is called with COINIT_APARTMENTTHREADED flag).
MTA Multithreaded Apartment (CoInitializeEx is called with COINIT_MULTITHREADED flag).
None Threading model is not specified.

Configuring a threading model

Example: To request MTA threading model from C++ mark-up:

class ThreadModelTests
{

    TEST_CLASS(ThreadModelTests);

    BEGIN_TEST_METHOD(MTAThreadingModelTest)
        TEST_METHOD_PROPERTY(L"ThreadingModel", L"STA")
    END_TEST_METHOD()
};

You can also request threading model property for a class or a module. For example,

class ThreadModelTestsWithMTADefault
{

    BEGIN_TEST_CLASS(ThreadModelTestsWithMTADefault)
        TEST_CLASS_PROPERTY(L"ThreadingModel", L"Mta")
    END_TEST_CLASS()

    TEST_METHOD(DefaultWithMTASetByClass);
};

Similarly, you can also request threading model for managed tests:

[TestClass]

public class SimpleTests
{
    [TestMethod]
    [TestProperty("ThreadingModel", "MTA")]
    public void Test1()
    {
        Verify.IsTrue(true);
    }

    [TestMethod]
    [TestProperty("ThreadingModel", "STA")]
    public void Test2()
    {
        Verify.IsTrue(true);
    }

    [TestMethod]
    [TestProperty("ThreadingModel", "{STA; MTA}")]
    public void SetsOfMetadataTest()
    {
        Log.Comment("In CSharpThreadingModelExample.SetsOfMetadataTest");
        DisplayAppartmentState();
    }
}

Notice in the last test above: SetsOfMetadataTest, it is also possible to make use of metadata sets and run the same test: first with STA threading model and then with MTA.

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