Nothing
local({
## TODO: port to testthat
require(Rip46)
require(tools)
f <- function(x) stopifnot(all(is.na( x )))
stopifnot( as.character(as.ip4("192.168.1.1")) == "192.168.1.1")
f( as.ip4(as.character(NA)) )
f( as.ip4(as.numeric(NA)) )
f( as.ip4(as.integer(NA)) )
f( as.ip4("NA") )
f( as.ip4("300.300.300.300") )
f( as.character(as.ip4("NA")) )
f( as.ip6("QQ:aa:11::") )
f( as.ip6(as.character(NA)) )
f( as.character(as.ip6(as.character(NA))) )
})
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