Paul Murrell and Kurt Hornik
Quality Assurance for Graphics in R
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An important part of software development involves testing
the reliability of the software. R has good tools
for checking that the software runs without catastrophic failure,
but provides less support for checking that the software
produces the correct output, particularly for  graphics code.
This paper discusses the sort of testing that would be
desirable, several ways that this testing could be performed,
and introduces some early attempts at providing tools
for performing such testing.