Nunit 3.12.0 在 WPF 视图模型单元测试中缺少 [RequiresSTA]。 调用线程必须是 STA

Question

After update Nunit from version v2.6.3 to 3.12.0. my unit stopped passing. The problem occurs in unit tests with RequiresSTAAttribute witch could not be found after update.

[Test]
[RequiresSTA]
public void When_Smart_Motion_Activity_Is_Selected_The_Values_Are_Valid()
{
     SomeViewModel vm = ViewModelHelper.CreateDefaultViewModel();
     ...
}

With attribute removed test failed with following exception:

System.InvalidOperationException : The calling thread must be STA, because many UI components require this. at System.Windows.Input.InputManager..ctor() at System.Windows.Input.InputManager.GetCurrentInputManagerImpl() at System.Windows.Input.KeyboardNavigation..ctor() at System.Windows.FrameworkElement.FrameworkServices..ctor() at System.Windows.FrameworkElement.EnsureFrameworkServices() at System.Windows.FrameworkElement..ctor() at System.Windows.Controls.Panel..ctor() at System.Windows.Controls.Canvas..ctor() at project..... :line xyz

Is there any suggested workaround or replacement for [RequiresSTA] that works for 3.12.0 ?

Answer 1

You can use:

[Test]
[Apartment(ApartmentState.STA)]
public void When_Smart_Motion_Activity_Is_Selected_The_Values_Are_Valid()
{
     SomeViewModel vm = ViewModelHelper.CreateDefaultViewModel();
     ...
}