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("strrep", envir = baseenv())) {
+   f = get("strrep", envir = baseenv())
+   expect_same = makeCompareFun(f, backports:::strrep)
+ 
+   expect_same(NULL, 0)
+   expect_same(NULL, 1)
+   expect_same(NULL, 2)
+   expect_same(NULL, 1:2)
+   expect_same(character(0), 0)
+   expect_same(character(0), 1)
+   expect_same(character(0), 2)
+   expect_same(character(0), 1:2)
+   expect_same("", 0)
+   expect_same("", 1)
+   expect_same("", 2)
+   expect_same("", 1:2)
+   expect_same("a", 0)
+   expect_same("a", 1)
+   expect_same("a", 2)
+   expect_same("a", 1:2)
+   expect_same(NA, 0)
+   expect_same(NA, 1)
+   expect_same(NA, 1:2)
+   expect_same(NA_character_, 0)
+   expect_same(NA_character_, 1)
+   expect_same(NA_character_, 2)
+   expect_same(NA_character_, 1:2)
+   expect_same(letters[1:2], 0)
+   expect_same(letters[1:2], 1)
+   expect_same(letters[1:2], 2)
+   expect_same(letters[2:2], 1:2)
+   expect_same(TRUE, 0)
+   expect_same(TRUE, 1)
+   expect_same(TRUE, 2)
+   expect_same(TRUE, 1:2)
+   expect_same("a", NA)
+   expect_same("a", c(1, NA, 2))
+ }
> 
> proc.time()
   user  system elapsed 
   0.28    0.03    0.28