Visual testing for R

vtest provides a platform for testing graphical output from R packages. It is made up of three main parts:

1. Functions that you run to construct your visual tests suite: vcontext(), save_vtest(), end_vcontext()

2. vtest() to run a suite of visual tests and save the results locally

3. Functions to compare runs of tests and display differences.

Currently vtest only works with ggplot2.