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diff --git a/lib/spack/spack/test/log.py b/lib/spack/spack/test/log.py
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+##############################################################################
+# Copyright (c) 2013-2016, 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
+##############################################################################
+from __future__ import print_function
+import pytest
+
+from llnl.util.tty.log import log_output
+from spack.util.executable import which
+
+
+def test_log_python_output_with_python_stream(capsys, tmpdir):
+    # pytest's DontReadFromInput object does not like what we do here, so
+    # disable capsys or things hang.
+    with capsys.disabled():
+        with log_output('foo.txt'):
+            print('logged')
+
+    with open('foo.txt') as f:
+        assert f.read() == 'logged\n'
+
+    assert capsys.readouterr() == ('', '')
+
+
+def test_log_python_output_with_fd_stream(capfd, tmpdir):
+    with log_output('foo.txt'):
+        print('logged')
+
+    with open('foo.txt') as f:
+        assert f.read() == 'logged\n'
+
+    assert capfd.readouterr() == ('', '')
+
+
+def test_log_python_output_and_echo_output(capfd, tmpdir):
+    with log_output('foo.txt') as logger:
+        with logger.force_echo():
+            print('echo')
+        print('logged')
+
+    assert capfd.readouterr() == ('echo\n', '')
+
+    with open('foo.txt') as f:
+        assert f.read() == 'echo\nlogged\n'
+
+
+@pytest.mark.skipif(not which('echo'), reason="needs echo command")
+def test_log_subproc_output(capsys, tmpdir):
+    echo = which('echo')
+
+    # pytest seems to interfere here, so we need to use capsys.disabled()
+    # TODO: figure out why this is and whether it means we're doing
+    # sometihng wrong with OUR redirects.  Seems like it should work even
+    # with capsys enabled.
+    with capsys.disabled():
+        with log_output('foo.txt'):
+            echo('logged')
+
+    with open('foo.txt') as f:
+        assert f.read() == 'logged\n'
+
+
+@pytest.mark.skipif(not which('echo'), reason="needs echo command")
+def test_log_subproc_and_echo_output(capfd, tmpdir):
+    echo = which('echo')
+
+    with log_output('foo.txt') as logger:
+        with logger.force_echo():
+            echo('echo')
+        print('logged')
+
+    assert capfd.readouterr() == ('echo\n', '')
+
+    with open('foo.txt') as f:
+        assert f.read() == 'logged\n'