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diff --git a/tests/test/hnh-util.scm b/tests/test/hnh-util.scm
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+++ b/tests/test/hnh-util.scm
@@ -0,0 +1,357 @@
+;;; Commentary:
+;; Checks some prodecuders from (hnh util)
+;;; Code:
+
+(define-module (test hnh-util)
+  :use-module (srfi srfi-64)
+  :use-module (srfi srfi-64 test-error)
+  :use-module (srfi srfi-88)
+  :use-module (srfi srfi-1)
+  :use-module (hnh util)
+  :use-module (hnh util env)
+  )
+
+
+;;; Changed core bindings
+
+(test-group "set!"
+  'TODO)
+
+(test-group "define-syntax"
+  'TODO)
+
+(test-group "when"
+ (test-equal "when"
+   1 (when #t 1))
+
+ (test-equal "'() when #f"
+   '() (when #f 1)))
+
+(test-group "unless"
+ (test-equal "unless"
+   1 (unless #f 1))
+
+ (test-equal "'() unless #t"
+   '() (unless #t 1)))
+
+
+
+;;; New bindings
+
+(test-group "aif"
+  'TODO)
+
+(test-group "awhen"
+ (test-equal "awhen it"
+   '(3 4 5)
+   (awhen (memv 2 '(1 2 3 4 5))
+          (cdr it)))
+
+ (test-equal "awhen not"
+   '()
+   (awhen (memv 0 '(1 2 3 4 5))
+          (cdr it))))
+
+(test-group "for"
+ (test-equal "for simple"
+   (iota 10)
+   (for x in (iota 10)
+        x))
+
+ (test-equal "for matching"
+   (iota 12)
+   (for (x c) in (zip (iota 12) (string->list "Hello, World"))
+        x))
+
+ (test-equal "for with improper list elements"
+   `(3 7)
+   (for (a . b) in '((1 . 2) (3 . 4))
+        (+ a b)))
+
+ (test-equal "for with longer improper list elements"
+   '(1 2 4)
+   (for (a b . c) in '((1 -1 . 1) (2 -2 . 2) (4 -4 . 4))
+        (* c (+ 1 a b)))))
+
+(test-group "begin1"
+ (let ((value #f))
+   (test-equal
+       "begin1 return value"
+     "Hello"
+     (begin1 "Hello" (set! value "World")))
+   (test-equal "begin1 side effects" "World" value))
+
+ (let ((x 1))
+   (test-eqv "begin1 set! after return"
+     1 (begin1 x (set! x 10)))
+   (test-eqv "Updates value"
+     10 x)))
+
+(test-group "print-and-return"
+  'TODO)
+
+(test-group "swap"
+  'TODO)
+
+(test-group "set/r!"
+ (test-equal
+     "set/r! = single"
+   #f
+   (let ((x #t)) (set/r! x = not)))
+
+ (test-error
+     'syntax-error
+   (test-read-eval-string "(set/r! x err not)")))
+
+(test-group "label"
+ (test-equal "procedure label"
+   120
+   ((label factorial (lambda (n)
+                       (if (zero? n)
+                           1 (* n (factorial (1- n))))))
+    5)))
+
+(test-group "sort*"
+ ;; we can't test if sort*! destroys the list, since its only /allowed/ to do it,
+ ;; not required.
+ (test-equal "sort*!"
+   '("a" "Hello" "Assparagus")
+   (sort*! '("Hello" "a" "Assparagus")
+           < string-length)))
+
+
+(test-group "find-extreme"
+  (test-error 'wrong-type-arg (find-extreme '()))
+
+  (test-group "find-min"
+   (call-with-values
+       (lambda () (find-min (iota 10)))
+     (lambda (extreme rest)
+       (test-equal "Found correct minimum" 0 extreme)
+       (test-equal
+           "Removed \"something\" from the set"
+         9
+         (length rest)))))
+
+  (test-group "find-max"
+   (call-with-values
+       (lambda ()
+         (find-max
+          '("Hello" "Test" "Something long")
+          string-length))
+     (lambda (extreme rest)
+       (test-equal
+           "Found the longest string"
+         "Something long"
+         extreme)
+       (test-equal "Removed the string" 2 (length rest))
+       (test-assert
+           "Other members left 1"
+         (member "Hello" rest))
+       (test-assert
+           "Other members left 2"
+         (member "Test" rest))))))
+
+(test-group "filter-sorted"
+ (test-equal
+     "Filter sorted"
+   '(3 4 5)
+   (filter-sorted (lambda (x) (<= 3 x 5)) (iota 10))))
+
+
+(test-group "!="
+ (test-assert "not equal"
+   (!= 1 2)))
+
+
+(test-group "take-to"
+ (test-equal "Take to"
+   '() (take-to '() 5)))
+
+(test-group "string-take-to"
+  'TODO)
+
+(test-group "string-first"
+  'TODO)
+
+(test-group "string-last"
+  'TODO)
+
+(test-group "as-symb"
+  'TODO)
+
+
+(test-group "enumerate"
+ (test-equal "Enumerate"
+   '((0 #\H) (1 #\e) (2 #\l) (3 #\l) (4 #\o) (5 #\,) (6 #\space) (7 #\W) (8 #\o) (9 #\r) (10 #\l) (11 #\d) (12 #\!))
+   (enumerate (string->list "Hello, World!"))))
+
+
+(test-group "unval"
+ (test-equal "unval first"
+   1
+   ((unval (lambda () (values 1 2 3)))))
+
+ (test-equal "unval other"
+   2
+   ((unval car+cdr 1)
+    (cons 1 2))))
+
+
+(test-group "flatten"
+ (test-equal "flatten already flat"
+   (iota 10)
+   (flatten (iota 10)))
+
+ (test-equal "flatten really deep"
+   '(1)
+   (flatten '(((((((((((((((1)))))))))))))))))
+
+ (test-equal "flatten mixed"
+   '(1 2 3 4 5)
+   (flatten '((((((1(((((2((((3))))))4))))))))5))))
+
+(test-group "let-lazy"
+  'TODO)
+
+(test-group "map/dotted"
+ (test-equal "map/dotted without dot"
+   '(1 2 3 4)
+   (map/dotted 1+ '(0 1 2 3)))
+
+ (test-equal "map/dotted with dot"
+   '(1 2 3 . 4)
+   (map/dotted 1+ '(0 1 2 . 3)))
+
+ (test-equal "map/dotted direct value"
+   1 (map/dotted 1+ 0)))
+
+(test-group "assq-merge"
+  (test-equal "assq merge"
+    '((k 2 1) (v 2))
+    (assq-merge '((k 1) (v 2)) '((k 2)))))
+
+
+(test-group "kvlist->assq"
+ (test-equal "kvlist->assq"
+   '((a . 1) (b . 2))
+   (kvlist->assq '(a: 1 b: 2)))
+
+ (test-equal "kvlist->assq repeated key"
+   '((a . 1) (b . 2) (a . 3))
+   (kvlist->assq '(a: 1 b: 2 a: 3))))
+
+(test-group "assq-limit"
+  'TODO)
+
+
+(test-group "group-by"
+  ;; Extra roundabout tests since groups-by doesn't guarantee order of the keys
+  (test-group "Two simple groups"
+    (let ((groups (group-by even? (iota 10))))
+      (test-assert (lset= eq? '(#f #t) (map car groups)))
+      (test-assert (lset= = '(0 2 4 6 8) (assq-ref groups #t)))
+      (test-assert (lset= = '(1 3 5 7 9) (assq-ref groups #f)))))
+
+  (test-group "Identity groups"
+    (let ((groups (group-by identity (iota 5))))
+      (test-assert "Correct keys"
+        (lset= = (iota 5) (map car groups)))
+      (test-group "Correct amount in each group"
+        (for-each (lambda (g) (test-equal 1 (length (cdr g)))) groups))))
+
+  (test-equal "Null case"
+    '()
+    (group-by (lambda _ (/ 0)) '())))
+
+(test-group "split-by"
+  'TODO)
+
+
+(test-group "span-upto"
+  (test-group "Case 1"
+   (call-with-values
+       (lambda ()
+         (span-upto
+          2
+          char-numeric?
+          (string->list "123456")))
+     (lambda (head tail)
+       (test-equal '(#\1 #\2) head)
+       (test-equal '(#\3 #\4 #\5 #\6) tail))))
+
+  (test-group "Case 2"
+   (call-with-values
+       (lambda ()
+         (span-upto
+          2
+          char-numeric?
+          (string->list "H123456")))
+     (lambda (head tail)
+       (test-equal '() head)
+       (test-equal '(#\H #\1 #\2 #\3 #\4 #\5 #\6) tail)))))
+
+(test-group "cross-product"
+  'TODO)
+
+(test-group "string-flatten"
+  'TODO)
+
+(test-group "intersperse"
+  'TODO)
+
+(test-group "insert-ordered"
+  'TODO)
+
+(test-group "-> (arrows)"
+  (test-equal "->" 9 (-> 1 (+ 2) (* 3)))
+  (test-equal "-> order dependant" -1 (-> 1 (- 2)))
+  (test-equal "->> order dependant" 1 (->> 1 (- 2))))
+
+(test-group "set"
+  'TODO)
+
+(test-group "set->"
+  'TODO)
+
+(test-group "and=>"
+  'TODO)
+
+(test-group "downcase-symbol"
+  'TODO)
+
+
+(test-group "group"
+  ;; TODO test failure when grouping isn't possible?
+  (test-equal "Group"
+    '((0 1) (2 3) (4 5) (6 7) (8 9))
+    (group (iota 10) 2)))
+
+(test-group "iterate"
+  (test-equal 0 (iterate 1- zero? 10)))
+
+(test-group "valued-map"
+  'TODO)
+
+(test-group "assoc-ref-all"
+  (test-equal "assoc-ref-all"
+    '(1 3) (assoc-ref-all '((a . 1) (b . 2) (a . 3)) 'a))
+  (test-equal "assq-ref-all"
+    '(1 3) (assq-ref-all '((a . 1) (b . 2) (a . 3)) 'a))
+  (test-equal "assv-ref-all"
+    '(1 3) (assv-ref-all '((a . 1) (b . 2) (a . 3)) 'a)))
+
+(test-group "unique"
+  'TODO)
+
+(test-group "vector-last"
+  (test-equal "vector-last"
+    1 (vector-last #(0 2 3 1))))
+
+(test-group "->string"
+  (test-equal "5" (->string 5))
+  (test-equal "5" (->string "5")))
+
+(test-group "catch*"
+  'TODO)
+