1. A computer-implemented method for generating stochastic page description language test inputs, wherein the method comprises: modifying at least one page description language file from a plurality of existing page description language files by: replacing existing text data in the page description language file with randomly generated text data; performing the steps of: replacing values of parameters associated with at least one existing graphics object in the page description language file with randomly generated parameter values, replacing values of parameters associated with at least one image object in the page description language file with randomly generated parameter values, and replacing values of parameters associated with graphical combining operations for at least one image or graphics object with randomly generated parameter values; and modifying values of page description language command parameters in the page description language file with randomly generated parameter values; and storing the at least one modified page description language file.