protected async Task WhenWaitingForSomethingToBeDone(IAppiumSession sut)
        {
            var textBox = sut.FindTextBox("AsyncWpfOutputTextBox");

            do
            {
                await Task.Delay(100);
            } while (!textBox.Text.Contains(Done));
        }
        protected void ThenItIsDone(IAppiumSession sut)
        {
            var textBox = sut.FindTextBox("AsyncWpfOutputTextBox");

            Assert.IsTrue(textBox.Text.Contains(Done));
        }