public void ReplaceSpanTest() { Span span = new Span() { Text = "This is text." }; FormattedString newText = text.ReplaceSpan(span, new Span()); Assert.AreEqual(newText.Length, text.Length); Assert.AreEqual(newText.Text, text.Text.Replace(span.Text, null)); Assert.AreEqual(newText.AnySpanReferenceEquals(text), false); }