R package tests

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I was wondering if anyone could point me in the right direction for reading up on writing tests in
R. I'm writing some functions for inclusion into a package and would like to test them to ensure
they're doing what I expect them to do.

Are these approaches used for testing packages in CRAN?

Cheers,
Nathan


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Dr. Nathan S. Watson-Haigh
OCE Post Doctoral Fellow
CSIRO Livestock Industries
Queensland Bioscience Precinct
St Lucia, QLD 4067
Australia

Tel: +61 (0)7 3214 2922
Fax: +61 (0)7 3214 2900
Web: http://www.csiro.au/people/Nathan.Watson-Haigh.html
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