TESTS: Adjust assertions for future (>= 1.11.0)

Author: HenrikBengtsson

tests/stdout.R

@@ -31,7 +31,7 @@ for (stdout in c(TRUE, FALSE, NA)) {
   stopifnot(value(f) == 42L)
 
   if (is.na(stdout)) {
-    stopifnot(!"stdout" %in% names(r))
+    stopifnot(is.null(r$stdout) || r$stdout == "")
   } else if (stdout) {
     print(r)
     stopifnot(identical(r$stdout, truth))