fails:FileTest.identical? returns true for a file and its link
fails:FileTest.identical? returns false if any of the files doesn't exist
fails:FileTest.identical? accepts an object that has a #to_path method
fails:FileTest.identical? raises an ArgumentError if not passed two arguments
fails:FileTest.identical? raises a TypeError if not passed String types
fails:FileTest.identical? returns true if both named files are identical
