R Under development (unstable) (2024-01-07 r85787 ucrt) -- "Unsuffered Consequences"
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Platform: x86_64-w64-mingw32/x64

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> library(unittest, quietly = TRUE)
> 
> expect_equal <- function (expr, expected) {
+     actual <- capture.output(expr)
+     if (!identical(all.equal(actual, expected), TRUE)) {
+         stop("ok_group output didn't match: ", actual)
+     }
+ }
> 
> # Expression printed
> expect_equal(ok_group("camels", TRUE), c(
+     "# camels"))
> 
> # Can have multiple lines in a vector
> expect_equal(ok_group(c("camels", "ostriches"), TRUE), c(
+     "# camels",
+     "# ostriches"))
> 
> # Can divide lines with newlines too
> expect_equal(ok_group(c("camels\nbadgers\r\nhoney badgers", "ostriches"), FALSE), c(
+     "# camels",
+     "# badgers",
+     "# honey badgers",
+     "# ostriches"))
> 
> # Expression evaluated after printing section message
> expect_equal(ok_group("camels", print("moo")), c(
+     "# camels",
+     '[1] "moo"'))
> 
> # Return NULL
> expect_equal({
+     if (!is.null(ok_group("camels", 6))) stop("Didn't return NULL")
+ }, c("# camels"))
> 
> proc.time()
   user  system elapsed 
   0.25    0.07    0.26