The Markdown class should implement an interace to make mocking easier about markdownsharp HOT 4 OPEN

I don't understand the advantage here versus the existing unit tests that are 
shipped in the code?

The point is that I would like to mock out the Markdown class in my code.  Most 
mocking frameworks require that you mock an interface or that the class have 
virtual methods.  Adding an interface, which the Markdown class implements, 
makes it trivial to mock it in my code.