public void NSTextInputClient_ShouldMarkText()
{
textView.SetMarkedText((NSString)"Testing", new NSRange(0, 10), new NSRange(5, 4));
Assert.IsTrue(textView.HasMarkedText, "NSTextInputClient_ShouldMarkText - Failed to mark text");
Assert.AreEqual(textView.MarkedRange, new NSRange(5, 7));
}