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diff --git a/conftest.py b/conftest.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/spack/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 pytest
+
+
+# Hooks to add command line options or set other custom behaviors.
+# They must be placed here to be found by pytest. See:
+#
+# https://docs.pytest.org/en/latest/writing_plugins.html
+#
+def pytest_addoption(parser):
+    group = parser.getgroup("Spack specific command line options")
+    group.addoption(
+        '--fast', action='store_true', default=False,
+        help='runs only "fast" unit tests, instead of the whole suite')
+
+
+def pytest_collection_modifyitems(config, items):
+    if not config.getoption('--fast'):
+        # --fast not given, run all the tests
+        return
+
+    slow_tests = ['db', 'network', 'maybeslow']
+    skip_as_slow = pytest.mark.skip(
+        reason='skipped slow test [--fast command line option given]'
+    )
+    for item in items:
+        if any(x in item.keywords for x in slow_tests):
+            item.add_marker(skip_as_slow)