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")
> 
> if (exists("trimws", envir = baseenv())) {
+   f = get("trimws", envir = baseenv())
+   expect_same = makeCompareFun(f, backports:::trimws)
+ 
+   expect_same("")
+   expect_same(NA)
+   expect_same(NA_character_)
+   expect_same(sprintf(" %s ", letters))
+   expect_same(" x ")
+   expect_same(" x ", which = "both")
+   expect_same(" x ", which = "left")
+   expect_same(" x ", which = "right")
+   expect_same(1)
+ }
> 
> proc.time()
   user  system elapsed 
   0.23    0.06    0.28