R Under development (unstable) (2024-02-28 r85999 ucrt) -- "Unsuffered Consequences"
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Platform: x86_64-w64-mingw32/x64

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> source("incl/start.R")
> 
> message("*** freePort() ...")
*** freePort() ...
> 
> set.seed(42)
> rng <- .Random.seed
> 
> for (kk in 1:5) {
+   port <- freePort()
+   message("A random free TCP port: ", port)
+   stopifnot(is.integer(port), length(port) == 1L)
+   if (!is.na(port)) stopifnot(port >= 0L, port <= 65535L)
+   stopifnot(identical(.Random.seed, rng))
+ }
A random free TCP port: 7566
A random free TCP port: 23502
A random free TCP port: 48263
A random free TCP port: 2435
A random free TCP port: 45895
> 
> 
> message("- freePort('auto')")
- freePort('auto')
> 
> Sys.unsetenv("R_PARALLEL_PORT")
> port <- freePort("auto")
> message("A random free TCP port: ", port)
A random free TCP port: 23168
> 
> message("- freePort('auto') with env var R_PARALLEL_PORT = 8888")
- freePort('auto') with env var R_PARALLEL_PORT = 8888
> Sys.setenv(R_PARALLEL_PORT = 8888L)
> port <- freePort("auto")
> message("A free TCP port: ", port)
A free TCP port: 8888
> stopifnot(port == 8888L)
> 
> 
> message("*** freePort() ... DONE")
*** freePort() ... DONE
> 
> source("incl/end.R")
> 
> proc.time()
   user  system elapsed 
   0.26    0.03    0.26