These next three sections should be spaced identical: there should be a blank line before the preformatted text and a blank line after the pre-formatted text, but no other blank lines.

Before
Preformatted text, no newlines inside
After
Before
Preformatted text, one newline after open-pre tag
After
Before
Preformatted text, one newline after open-pre tag and before close tag
After
Make sure newlines are preserved: one
Make sure newlines are preserved: two

Make sure newlines are preserved: three


End of this section
These next set of lines should be lined up neatly 
x       x       x       x       x       x       x       x       x       end
X	X	X	X	X	X	X	X	X	end
X	x       X	x       x       X	X	x       x       end
Make sure whitespace is preserved: 
     Five blanks
    Four blanks
   Three blanks
  Two blanks
 Blank
None!