is.error: Check if an expression returns an error

In berryFunctions: Function Collection Related to Plotting and Hydrology

Check if an expression returns an error

Description

Does a given expression return an error? Useful for tests where you want to make sure your function throws an error.

Usage

is.error(expr, tell = FALSE, force = FALSE)

Arguments

expr	Expression to be tested for returning an error
tell	Logical: Should the error message be printed via message? DEFAULT: FALSE
force	Logical: Should an error be returned if the expression is not an error? DEFAULT: FALSE

Value

TRUE/FALSE

Author(s)

Berry Boessenkool, [e-mail], May 2016

See Also

stop, try, inherits

Examples

is.error(  log(3)              )
is.error(  log("a")            )
is.error(  log(3),   tell=TRUE )
is.error(  log("a"), tell=TRUE )
stopifnot( is.error( log("a")  )  ) # or shorter:
is.error(  log("a"), force=TRUE)
# is.error(  log(3),   force=TRUE)
stopifnot(is.error(  is.error(log(3), force=TRUE)  ))

berryFunctions documentation built on May 29, 2024, 4:01 a.m.