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2013-01-23T21:31:38.673
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If you're writing your own package, it might make sense to make use of R's condition system by throwing (and catching) particular types of errors or warnings. So <pre><code>myFun <- function(x) { if (any(is.na(x))) { w <- simpleWarning("'x' contains NA values") class(w) <- c("HasNA", class(w)) warning(w) } if (any(x < 0)) warning("'x' contains values less than 0") x } </code></pre> and then in your test, e.g., with <code>library(RUnit)</code>, use <code>tryCatch</code> and pick off just the conditions that you're interested in testing, i.e., warnings with class <code>HasNA</code>: <pre><code>test_myFun_NAwarning <- function() { warnOccurred <- FALSE tryCatch(myFun(1:5), HasNA = function(w) warnOcccurred <<- TRUE) checkTrue(!warnOccurred) tryCatch(myFun(-(1:5)), HasNA = function(w) warnOcccurred <<- TRUE) checkTrue(!warnOccurred) tryCatch(myFun(c(1:5, NA)), HasNA = function(w) warnOccurred <<- TRUE) checkTrue(warnOccurred) } </code></pre> leading to <pre><code>> test_myFun_NAwarning() [1] TRUE Warning message: In myFun(-(1:5)) : 'x' contains values less than 0 </code></pre> which shows that tryCatch is catching just the particular warning you're interested in, and doing so in a way that does not rely on matching the text of the string. Maybe you'd have a helper function <code>.warn</code> to make all warnings for your package. See <code>?withCallingHandlers</code> for additional detail; <code>withCallingHandlers</code> and <code>muffleRestart</code> are how one might cope with continuing evaluation after a warning occurred, rather than stopping the way <code>tryCatch</code> does.
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1. POHow to write a package test in R to see if warning is correctly thrown?
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