R Under development (unstable) (2025-05-01 r88184 ucrt) -- "Unsuffered Consequences"
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> library("profmem")
> 
> profmem_stack <- profmem:::profmem_stack
> 
> ## In case there are active profmem session in the current R session
> ## (shouldn't happen during 'R CMD check' though)
> while (profmem_stack("depth") > 0) profmem_stack("pop")
> 
> ## Trying to pop from empty stack
> res <- tryCatch({
+   p <- profmem_stack("pop")
+ }, error = identity)
> print(res)
<simpleError in profmem_stack("pop"): Cannot 'pop' - profmem stack is empty>
> stopifnot(inherits(res, "error"))
> 
> ## Trying non-existing stack action
> res <- tryCatch({
+   p <- profmem_stack("non-existing")
+ }, error = identity)
> print(res)
<simpleError in match.arg(action): 'arg' should be one of "status", "depth", "threshold", "push", "pop", "append", "suspend", "resume">
> stopifnot(inherits(res, "error"))
> 
> 
> if (capabilities("profmem")) {
+ 
+ ## Trying to end existing profmem session
+ res <- tryCatch({
+   p <- profmem_end()
+ }, error = identity)
+ print(res)
+ stopifnot(inherits(res, "error"))
+ 
+ } ## if (capabilities("profmem"))
<simpleError in profmem_end(): Did you forget to call profmem_begin()?>
> 
> proc.time()
   user  system elapsed 
   0.09    0.07    0.15