How to properly unit test calling UI method on another thread?
I've been trying different things and I've come up with the following:
[Test]public void TestInvokeExWithMethodReturningResultOnOtherThread (){ // Prepare string result = string.Empty; var form = new Form (); var uiThread = new Thread (() => Application.Run (form)); uiThread.SetApartmentState (ApartmentState.STA); uiThread.Start(); Thread.Sleep (100); var thread = new Thread (() => result = form.InvokeEx (f => f.Text)); // Execute thread.Start (); thread.Join (); form.InvokeEx (f => f.Close ()); uiThread.Join (); // Verify Assert.That (result, Is.EqualTo ("Some label"));}This now works perfectly.
Note that I had to add an overload for InvokeEx for a void method.