diff --git a/networks-tests.rkt b/networks-tests.rkt
index 8e4645c..9a17c4d 100644
--- a/networks-tests.rkt
+++ b/networks-tests.rkt
@@ -20,16 +20,14 @@
     (test-case "One-step syncronous update"
       (let* ([s (make-state '((x1 . #t) (x2 . #f)))]
              [new-s (update bn s '(x2 x1))])
-        (check-equal? (hash-ref new-s 'x1) #t)
-        (check-equal? (hash-ref new-s 'x2) #t)
-        (check-equal? (length (hash-keys new-s)) 2)))
+        (check-equal? s #hash((x1 . #t) (x2 . #f)))
+        (check-equal? new-s #hash((x1 . #t) (x2 . #t)))))
 
     (test-case "One-step asynchronous update"
       (let* ([s (make-state '((x1 . #f) (x2 . #f)))]
              [new-s (update bn s '(x2 x1))])
-        (check-equal? (hash-ref new-s 'x1) #f)
-        (check-equal? (hash-ref new-s 'x2) #t)
-        (check-equal? (length (hash-keys new-s)) 2)))))
+        (check-equal? s #hash((x1 . #f) (x2 . #f)))
+        (check-equal? new-s #hash((x1 . #f) (x2 . #t)))))))
 
 (test-case "Syntactic description of Boolean networks"
   (let ([s (make-state '((x . #t) (y . #f)))]
@@ -60,15 +58,15 @@
     (check-false (has-edge? ig 'c 'b))
     (check-false (has-edge? ig 'c 'a)))
 
-  (check-equal? (map hash->list (build-all-states #hash((a . (#t #f)) (b . (1 2 3)))))
-                '(((a . #t) (b . 1))
-                  ((a . #t) (b . 2))
-                  ((a . #t) (b . 3))
-                  ((a . #f) (b . 1))
-                  ((a . #f) (b . 2))
-                  ((a . #f) (b . 3))))
-  (check-equal? (hash->list (make-boolean-domains '(a b)))
-                '((a . (#f #t)) (b . (#f #t))))
+  (check-equal? (build-all-states #hash((a . (#t #f)) (b . (1 2 3))))
+                '(#hash((a . #t) (b . 1))
+                  #hash((a . #t) (b . 2))
+                  #hash((a . #t) (b . 3))
+                  #hash((a . #f) (b . 1))
+                  #hash((a . #f) (b . 2))
+                  #hash((a . #f) (b . 3))))
+  (check-equal? (make-boolean-domains '(a b))
+                #hash((a . (#f #t)) (b . (#f #t))))
 
   (let* ([n #hash((a . (not b)) (b . a))]
          [doms (make-boolean-domains '(a b))]