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  supplied expression produces an error, a warning or one of a
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  supplied expression produces an error, a warning or one of a
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  specified list of conditions, respectively.  If the assertion fails,
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  specified list of conditions, respectively.  If the assertion fails,
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  an error is signalled.
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  an error is signalled.
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}
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}
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\usage{
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\usage{
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assertError(expr)
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assertError(expr, verbose = FALSE)
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assertWarning(expr)
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assertWarning(expr, verbose = FALSE)
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assertCondition(expr, ..., .exprString = )
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assertCondition(expr, ..., .exprString = , verbose = FALSE)
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}
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}
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\arguments{
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\arguments{
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  \item{expr}{an unevaluated \R expression which will be evaluated via
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  \item{expr}{an unevaluated \R expression which will be evaluated via
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    \code{\link{tryCatch}(expr, ..)}.}
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    \code{\link{tryCatch}(expr, ..)}.}
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  \item{\dots}{\code{\link{character}} strings corresponding to the
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  \item{\dots}{\code{\link{character}} strings corresponding to the
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      deparsed.  Will be omitted if the function is supplied with the
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      deparsed.  Will be omitted if the function is supplied with the
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      actual expression to be tested.  If \code{assertCondition()} is
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      actual expression to be tested.  If \code{assertCondition()} is
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      called from another
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      called from another
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        function, with the actual expression passed as an argument to
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        function, with the actual expression passed as an argument to
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        that function, supply the deparsed version.}
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        that function, supply the deparsed version.}
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  \item{verbose}{If \code{TRUE}, a message is printed when the
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        condition is satisfied.}
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}
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}
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\details{
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\details{
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  \code{assertCondition()} uses the general condition mechanism to
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  \code{assertCondition()} uses the general condition mechanism to
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  check all the conditions generated in evaluating \code{expr}.  The
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  check all the conditions generated in evaluating \code{expr}.  The
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  occurrence of any of the supplied condition classes among these satisfies the
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  occurrence of any of the supplied condition classes among these satisfies the