R Under development (unstable) (2024-03-22 r86169 ucrt) -- "Unsuffered Consequences"
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> # testthat:::on_cran
> is_interactive <- rlang::is_interactive()
> not_cran <- isTRUE(as.logical(Sys.getenv("NOT_CRAN", "false")))
> on_cran <- !is_interactive && !not_cran
> 
> if (!on_cran) {
+   if (requireNamespace("spelling", quietly = TRUE)) {
+     spelling::spell_check_test(
+       vignettes = TRUE, error = FALSE,
+       skip_on_cran = TRUE
+     )
+   }
+ }
> 
> proc.time()
   user  system elapsed 
   0.21    0.04    0.25