WinForms application is not rendered when debugging a test

[miloszkukla]

Having a test like:

[Test]
public void Test()
{
    Application.Run(new Form());
}

works fine when run without debugging (form is visible) however when run with debugging, the form is not visible.

Possibly related to: https://github.com/nunit/nunit3-vs-adapter/pull/42 ?

• NUnit: v3.12
• NUnit3TestAdapter: v3.13
• Visual Studio 2017 Professional (15.9.5)
• .NET Framework 4.6.2

[jnm2]

Fyi @OsirisTerje, I reproduced this with the project I had open in VS (16.1)

[christianjunk]

The same for me:

• NUnit: v3.12.0
• NUnit3TestAdapter: v3.15.1
• Visual Studio 2019 Professional (16.3.10)
• .NET Framework 4.6.2

[christianjunk]

According to this StackOverflow question I used the following workaround:

[Test, Apartment(ApartmentState.STA)]
[STAThread]
public void NameOfYourTest()
{
    using (var form = new NameOfYourForm())
    {
        form.Visible = true;
        form.Focus();
        Application.Run(form);
    }
}

[OsirisTerje]

@christianjunk Thanks! That makes sense! Do you mean it worked as it should with adding that? If so, it's a good workaround.

[christianjunk]

@christianjunk Thanks! That makes sense! Do you mean it worked as it should with adding that? If so, it's a good workaround.

@OsirisTerje This solution worked for me as expected. According to NUnit3 I have edited my answer and added the following line:

[Test, Apartment(ApartmentState.STA)]

https://github.com/nunit/docs/wiki/Apartment-Attribute