R version 4.5.0 beta (2025-03-29 r88074 ucrt) -- "How About a Twenty-Six"
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Platform: x86_64-w64-mingw32/x64

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> evaluate_expr <- future.tests:::evaluate_expr
> 
> if (requireNamespace("ff")) {
+   message("* evaluate_expr() - 'ff' package ...")
+   
+   data <- ff::ff(1:12)
+   stopifnot(data[4] == 4L)
+   names <- grep("^ff[[:alpha:]]+$", names(options()), value = TRUE)
+   oopts <- options()[names]
+   
+   res <- evaluate_expr(quote({ requireNamespace("ff") }))
+   str(res)  
+   stopifnot(is.null(res$error), is.logical(res$value), isTRUE(res$value))
+   stopifnot(identical(options()[names], oopts))
+ 
+   res <- evaluate_expr(quote({ require("ff") }))
+   str(res)  
+   stopifnot(is.null(res$error), is.logical(res$value), isTRUE(res$value))
+   stopifnot(identical(options()[names], oopts))
+ 
+   message("* evaluate_expr() - 'ff' package ... DONE")
+ }
Loading required namespace: ff
* evaluate_expr() - 'ff' package ...
List of 8
 $ expr   : language {  requireNamespace("ff") }
 $ local  : logi TRUE
 $ timeout: num Inf
 $ error  : NULL
 $ value  : logi TRUE
 $ visible: logi FALSE
 $ output : chr ""
 $ time   : POSIXct[1:2], format: "2025-03-31 07:22:34" "2025-03-31 07:22:34"
List of 8
 $ expr   : language {  require("ff") }
 $ local  : logi TRUE
 $ timeout: num Inf
 $ error  : NULL
 $ value  : logi TRUE
 $ visible: logi FALSE
 $ output : chr ""
 $ time   : POSIXct[1:2], format: "2025-03-31 07:22:34" "2025-03-31 07:22:34"
* evaluate_expr() - 'ff' package ... DONE
> 
> proc.time()
   user  system elapsed 
   2.28    0.20    2.43