R Under development (unstable) (2024-05-22 r86590 ucrt) -- "Unsuffered Consequences"
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> source("helper/helper.R")
> 
> if (getRversion() >= "4.0.0") {
+ 
+   f = get("paste", envir = baseenv())
+   expect_same = makeCompareFun(f, backports:::paste)
+ 
+   expect_same(letters[1:3], character())
+   expect_same(letters[1:3], character(), recycle0 = TRUE)
+   expect_same(letters[1:3], character(), sep = "_", recycle0 = TRUE)
+   expect_same(letters[1:3], character(), sep = "_", collapse = "+", recycle0 = TRUE)
+   expect_same(letters[1:3], character(), collapse = NULL, recycle0 = TRUE)
+   expect_same(letters[1:3], character(), sep = NULL, recycle0 = TRUE)
+   expect_same(letters[1:3], character(), sep = NULL, collapse = NULL, recycle0 = TRUE)
+   expect_same(letters[1:3], character(), sep = character(), collapse = character(), recycle0 = TRUE)
+ 
+   expect_same(character())
+   expect_same(character(), recycle0 = TRUE)
+   expect_same(character(), sep = "_", recycle0 = TRUE)
+   expect_same(character(), sep = "_", collapse = "+", recycle0 = TRUE)
+   expect_same(character(), collapse = NULL, recycle0 = TRUE)
+   expect_same(character(), sep = NULL, recycle0 = TRUE)
+   expect_same(character(), sep = NULL, collapse = NULL, recycle0 = TRUE)
+   expect_same(character(), sep = character(), collapse = character(), recycle0 = TRUE)
+ 
+ 
+ 
+   f = get("paste0", envir = baseenv())
+   expect_same = makeCompareFun(f, backports:::paste0)
+ 
+   expect_same(letters[1:3], character())
+   expect_same(letters[1:3], character(), recycle0 = TRUE)
+   expect_same(letters[1:3], character(), recycle0 = TRUE)
+   expect_same(letters[1:3], character(), collapse = "+", recycle0 = TRUE)
+   expect_same(letters[1:3], character(), collapse = NULL, recycle0 = TRUE)
+   expect_same(letters[1:3], character(), collapse = NULL, recycle0 = TRUE)
+   expect_same(letters[1:3], character(), collapse = character(), recycle0 = TRUE)
+ 
+   expect_same(character())
+   expect_same(character(), recycle0 = TRUE)
+   expect_same(character(), recycle0 = TRUE)
+   expect_same(character(), collapse = "+", recycle0 = TRUE)
+   expect_same(character(), collapse = NULL, recycle0 = TRUE)
+   expect_same(character(), collapse = NULL, recycle0 = TRUE)
+   expect_same(character(), collapse = character(), recycle0 = TRUE)
+ }
> 
> expect_identical(
+   paste(letters[1:3], character(), collapse = NULL, recycle0 = TRUE),
+   character()
+ )
> 
> expect_identical(
+   paste(letters[1:3], character(), collapse = "_", recycle0 = TRUE),
+   ""
+ )
> 
> expect_identical(
+   paste0(letters[1:3], character(), collapse = NULL, recycle0 = TRUE),
+   character()
+ )
> 
> expect_identical(
+   paste0(letters[1:3], character(), collapse = "_", recycle0 = TRUE),
+   ""
+ )
> 
> proc.time()
   user  system elapsed 
   0.26    0.03    0.28