public void ParseFootNoteId()
        {
            // act
            var actual = FootNoteFormatterState.ParseFootNoteId("fn42");

            // assert
            Assert.AreEqual(42, actual);
        }
    public void ParseFootNoteId()
    {
        // arrange
        var input = "fn1{color:red}. This is the footnote";

        // act
        var actual = FootNoteFormatterState.ParseFootNoteId(input);

        // assert
        Assert.AreEqual(1, actual);
    }