public void DisplayLineNumberLayout() { var style = LayoutTestStyle.Create(); var ta = new TextArea(style); style.StyleResolver.AddRoot(ta); ta.DisplayLineNumbers = true; ta.Text = "Hello World"; ta.Arrange(new Rectangle(10, 20, 300, 100)); ta.LayoutRect.Should().Be(new Rectangle(10, 20, 300, 100)); ta.Content.LayoutRect.Should().Be(new Rectangle(51, 40, 239, 15)); }