R Under development (unstable) (2024-02-28 r85999 ucrt) -- "Unsuffered Consequences"
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> library(port4me)
> 
> is_tcp_port_available <- port4me:::is_tcp_port_available
> initialize_internet <- port4me:::initialize_internet
> parse_cli_args <- port4me:::parse_cli_args
> 
> # --------------------------------------------------------
> # is_tcp_port_available() and initialize_internet()
> # --------------------------------------------------------
> Sys.setenv("_PORT4ME_CHECK_AVAILABLE_PORTS_" = "<invalid>")
> res <- tryCatch({
+   is_tcp_port_available(1024)
+ }, error = identity)
> stopifnot(inherits(res, "error"))
> Sys.unsetenv("_PORT4ME_CHECK_AVAILABLE_PORTS_")
> 
> env <- environment(initialize_internet)
> env[["done"]] <- FALSE
> initialize_internet()
> 
> env <- environment(initialize_internet)
> env[["done"]] <- FALSE
> env[["baseenv"]] <- emptyenv()
> initialize_internet()
Warning message:
In socketConnection(port = 0L, server = FALSE, blocking = FALSE,  :
  localhost:0 cannot be opened
> 
> 
> # --------------------------------------------------------
> # Test unloading package
> # --------------------------------------------------------
> unloadNamespace("port4me")
> 
> 
> proc.time()
   user  system elapsed 
   0.10    0.06    0.17