+
+;;; The non-destructive case operations accept string designators, not
+;;; just strings.
+(assert (string= (string-upcase '|String designator|) "STRING DESIGNATOR"))
+(assert (string= (string-downcase #\S) "s"))
+(assert (string= (string-downcase #\.) "."))
+(assert (string= (string-capitalize 'ya-str-desig :end 5) "Ya-StR-DESIG"))
+
+;;; basic destructive case operations
+(let ((nstring (make-array 5 :element-type 'character :fill-pointer 0)))
+ (vector-push-extend #\c nstring)
+ (vector-push-extend #\a nstring)
+ (vector-push-extend #\t nstring)
+ (nstring-upcase nstring)
+ (assert (string= nstring "CAT"))
+ (setf (fill-pointer nstring) 2)
+ (nstring-downcase nstring :start 1)
+ (setf (fill-pointer nstring) 3)
+ (assert (string= nstring "CaT"))
+ (nstring-capitalize nstring)
+ (assert (string= nstring "Cat")))