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diff --git a/lib/spack/spack/test/modules/common.py b/lib/spack/spack/test/modules/common.py
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+++ b/lib/spack/spack/test/modules/common.py
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+##############################################################################
+# Copyright (c) 2013-2017, Lawrence Livermore National Security, LLC.
+# Produced at the Lawrence Livermore National Laboratory.
+#
+# This file is part of Spack.
+# Created by Todd Gamblin, tgamblin@llnl.gov, All rights reserved.
+# LLNL-CODE-647188
+#
+# For details, see https://github.com/llnl/spack
+# Please also see the NOTICE and LICENSE files for our notice and the LGPL.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License (as
+# published by the Free Software Foundation) version 2.1, February 1999.
+#
+# This program 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 terms and
+# conditions of the GNU Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+##############################################################################
+
+import spack.modules.common
+
+
+def test_update_dictionary_extending_list():
+    target = {
+        'foo': {
+            'a': 1,
+            'b': 2,
+            'd': 4
+        },
+        'bar': [1, 2, 4],
+        'baz': 'foobar'
+    }
+    update = {
+        'foo': {
+            'c': 3,
+        },
+        'bar': [3],
+        'baz': 'foobaz',
+        'newkey': {
+            'd': 4
+        }
+    }
+    spack.modules.common.update_dictionary_extending_lists(target, update)
+    assert len(target) == 4
+    assert len(target['foo']) == 4
+    assert len(target['bar']) == 4
+    assert target['baz'] == 'foobaz'