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diff --git a/tests/environment.scm b/tests/environment.scm
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+;;;; environment.scm -- tests for (mcron environment) module
+;;; Copyright © 2016 Mathieu Lirzin <mthl@gnu.org>
+;;;
+;;; This file is part of GNU Mcron.
+;;;
+;;; GNU Mcron 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 Mcron 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 Mcron.  If not, see <http://www.gnu.org/licenses/>.
+
+(use-modules (srfi srfi-64)
+             (mcron environment))
+
+(test-begin "environment")
+
+(test-assert "modifiy-environment: basic"
+  (begin
+    (modify-environment '(("FOO" . "bar")) (getpw))
+    (equal? (getenv "FOO") "bar")))
+
+(test-assert "modifiy-environment: user & logname"
+  ;; Check that USER and LOGNAME environment variables can't be changed.
+  (let* ((user-entry (pk (getpw)))
+         (user-name  (passwd:name user-entry)))
+    (modify-environment '(("USER" . "alice")) user-entry)
+    (modify-environment '(("LOGNAME" . "bob")) user-entry)
+    (equal? user-name
+            (pk (getenv "USER"))
+            (pk (getenv "LOGNAME")))))
+
+(test-end)