Nothing
message("*** devIsOpen() ...")
library("R.devices")
for (which in list(c(), 1L, 1:5)) {
print(which)
res <- devIsOpen(which)
print(res)
stopifnot(is.logical(res))
stopifnot(is.character(names(res)))
stopifnot(length(res) == length(which))
}
message("*** devIsOpen() ... DONE")
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