Creat an htmlwidget that shows differences between files or directories

This function can be used for viewing differences between current test results and the expected results

diffviewer_widget(old, new, width = NULL, height = NULL, pattern = NULL)

Arguments

old, new	Names of the old and new directories to compare. Alternatively, they can be a character vectors of specific files to compare.
width	Width of the htmlwidget.
height	Height of the htmlwidget
pattern	A filter to apply to the old and new directories.