MSTest.STAExtensions by Sai Krishna Vajjala

<PackageReference Include="MSTest.STAExtensions" Version="1.0.3-beta" />

 STATestClassAttribute

public class STATestClassAttribute : TestClassAttribute
Defines [STATestClass] attribute which runs all the test methods of a class under STAThread Note: STATestMethod Attribute is not required on test method if this attribute is defined at class level