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diff --git a/tests/hash.scm b/tests/hash.scm
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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2013 Ludovic Courtès <ludo@gnu.org>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (test-hash)
+  #:use-module (guix hash)
+  #:use-module (guix utils)
+  #:use-module (srfi srfi-1)
+  #:use-module (srfi srfi-11)
+  #:use-module (srfi srfi-64)
+  #:use-module (rnrs bytevectors)
+  #:use-module (rnrs io ports))
+
+;; Test the (guix hash) module.
+
+(define %empty-sha256
+  ;; SHA256 hash of the empty string.
+  (base16-string->bytevector
+   "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"))
+
+(define %hello-sha256
+  ;; SHA256 hash of "hello world"
+  (base16-string->bytevector
+   "b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde9"))
+
+(test-begin "hash")
+
+(test-equal "sha256, empty"
+  %empty-sha256
+  (sha256 #vu8()))
+
+(test-equal "sha256, hello"
+  %hello-sha256
+  (sha256 (string->utf8 "hello world")))
+
+(test-equal "open-sha256-port, empty"
+  %empty-sha256
+  (let-values (((port get)
+                (open-sha256-port)))
+    (close-port port)
+    (get)))
+
+(test-equal "open-sha256-port, hello"
+  %hello-sha256
+  (let-values (((port get)
+                (open-sha256-port)))
+    (put-bytevector port (string->utf8 "hello world"))
+    (get)))
+
+(test-assert "port-sha256"
+  (let* ((file     (search-path %load-path "ice-9/psyntax.scm"))
+         (size     (stat:size (stat file)))
+         (contents (call-with-input-file file get-bytevector-all)))
+    (equal? (sha256 contents)
+            (call-with-input-file file port-sha256))))
+
+(test-end)
+
+
+(exit (= (test-runner-fail-count (test-runner-current)) 0))