R Under development (unstable) (2024-05-22 r86590 ucrt) -- "Unsuffered Consequences"
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Platform: x86_64-w64-mingw32/x64

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> source("helper/helper.R")
> 
> f = get("capture.output", envir = getNamespace("utils"))
> expect_same = makeCompareFun(f, backports:::capture.output)
> 
> output = function() {
+   print("stdout")
+   message("stderr")
+ }
> suppressMessages({
+   expect_same(output())
+ })
> 
> if (getRversion() >= "3.3.0") {
+   suppressMessages({
+     expect_same(output(), type = "message")
+     expect_same(output(), type = "output")
+   })
+   expect_same(output(), type = c("message", "output"))
+ }
[1] "stdout"
[1] "stdout"
> 
> proc.time()
   user  system elapsed 
   0.18    0.12    0.29