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("startsWith", envir = baseenv())) {
+   f = get("startsWith", envir = baseenv())
+   expect_same = makeCompareFun(f, backports:::startsWith)
+ 
+   expect_same("a", "a")
+   expect_same(NA, "a")
+   expect_same("a", NA)
+   expect_same("a", "")
+   expect_same("", "a")
+   expect_same("", "")
+   expect_same(c("a", NA, "b"), "b")
+   expect_same("b", c("a", NA, "b"))
+   expect_same(letters, c("m", NA, ""))
+ }
> 
> if (exists("endsWith", envir = baseenv())) {
+   f = get("endsWith", envir = baseenv())
+   expect_same = makeCompareFun(f, backports:::endsWith)
+ 
+   expect_same("a", "a")
+   expect_same(NA, "a")
+   expect_same("a", NA)
+   expect_same("a", "")
+   expect_same("", "a")
+   expect_same("", "")
+   expect_same(c("a", NA, "b"), "b")
+   expect_same("b", c("a", NA, "b"))
+   expect_same(letters, c("m", NA, ""))
+ }
> 
> # adapted from R's unit tests
> t1 = c("Foobar", "bla bla", "something", "another", "blu", "brown", "blau blüht der Enzian")
> t2 = c("some text", "any text")
> t3 = c("Martin", "Zürich", "Mächler")
> 
> expect_true(all(backports:::startsWith(t1, "")))
> expect_true(all(backports:::endsWith(t1, "")))
> expect_true(all(backports:::endsWith(t2, "")))
> expect_true(all(backports:::startsWith(t2, "")))
> expect_true(all(backports:::endsWith(t3, "")))
> expect_true(all(backports:::startsWith(t3, "")))
> expect_true(all(backports:::endsWith(t2, "text")))
> expect_true(all(backports:::endsWith(t2, " text")))
> expect_identical(backports:::startsWith(t1, "b" ), c(FALSE, TRUE, FALSE, FALSE, TRUE,  TRUE, TRUE))
> expect_identical(backports:::startsWith(t1, "bl"), c(FALSE, TRUE, FALSE, FALSE, TRUE, FALSE, TRUE))
> expect_identical(backports:::startsWith(t1, "bla"),c(FALSE, TRUE, FALSE, FALSE,FALSE, FALSE, TRUE))
> expect_identical(backports:::endsWith(t1, "n"),  c(FALSE,FALSE, FALSE, FALSE,FALSE,  TRUE, TRUE))
> expect_identical(backports:::endsWith(t1, "an"), c(FALSE,FALSE, FALSE, FALSE,FALSE, FALSE, TRUE))
> expect_identical(backports:::startsWith(t3, "M" ), c( TRUE, FALSE, TRUE))
> expect_identical(backports:::startsWith(t3, "Ma"), c( TRUE, FALSE, FALSE))
> expect_identical(backports:::startsWith(t3, "Mä"), c(FALSE, FALSE, TRUE))
> 
> proc.time()
   user  system elapsed 
   0.21    0.07    0.28