Unit test: programlisting.014

This tests the parameters for trimming leading and trailing blank lines from a verbatim environment.

Defaults (trim trailing, not leading):

  | 
  | 
  | 
  |line four of four

Trim trailing, not leading, explicitly:

  | 
  | 
  | 
  |line four of four

Trim leading, not trailing:

  |line one of four
  | 
  | 
  | 

Trim both:

  |line one of one