diff --git a/functional-tests/cache-xml.scm b/functional-tests/cache-xml.scm
new file mode 100644
index 0000000..5661901
--- /dev/null
+++ b/functional-tests/cache-xml.scm
@@ -0,0 +1,47 @@
+(library
+  (cache-xml)
+  (export generate-xml)
+  (import (rnrs)
+          (list-utils)
+          (loops)
+          (generators)
+          (xml)
+          (fmt fmt)
+          (srfi s27 random-bits)
+          (only (srfi s1 lists) iota))
+
+  (define (make-enum-vector count)
+    (let ((v (make-vector count)))
+     (upto (n count)
+           (vector-set! v n n))
+     v))
+
+  (define (vector-swap! v n m)
+    (let ((tmp (vector-ref v n)))
+     (vector-set! v n (vector-ref v m))
+     (vector-set! v m tmp)))
+
+  (define (rnd b e)
+    (+ b (random-integer (- e b))))
+
+  (define (vector-partial-shuffle! v count)
+    (let ((len (vector-length v)))
+     (upto (n count)
+           (vector-swap! v n (rnd n len)))))
+
+  ;;---------------------------------------------------------
+
+  (define (generate-xml block-size nr-origin-blocks nr-cache-blocks)
+    (tag 'superblock `((uuid . "")
+                       (block-size . ,block-size)
+                       (nr-cache-blocks . ,nr-cache-blocks)
+                       (policy . "smq")
+                       (hint-width . 4))
+         ;; FIXME: what a waste of memory
+         (let ((v (make-enum-vector nr-origin-blocks)))
+           (vector-partial-shuffle! v nr-cache-blocks)
+           (vcat (map (lambda (cblock)
+                        (tag 'mapping `((cache-block . ,cblock)
+                                        (origin-block . ,(vector-ref v cblock))
+                                        (dirty . "true"))))
+                      (iota nr-cache-blocks)))))))