Hi,

Winston Chang designed the vtest package for a similar purpose,

https://github.com/wch/ggplot2/wiki/Visual-test-system

https://github.com/wch/vtest

I don't know if / how well it works outside the ggplot2 framework, but it's
pretty slick.

HTH,

baptiste



On 22 January 2014 11:35, Therneau, Terry M., Ph.D. <therneau@mayo.edu>wrote:

> I pride myself on having an extensive and comprehensive test suite for the
> survival package.
>
> However, I don't have a good procedure for testing the plotting routines.
>  (Forget "good", I don't even have a third-rate procedure for this.)  This
> was brought home with the latest release; within 24 hours I got a note
> about a problem.  They y-axis range for a plot was calculated incorrectly,
> giving no warning or error, just a graph with 2/3 of the data outside the
> plot window.  It was a side effect of a change for another reason, and of
> course I had checked out that consequence thoroughly.
>
> Any good ideas for this issue?
>
> Terry Therneau
>
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