Mark slow unit tests (#6994)

* Marking database tests as slow

* Marking url command tests as slow

* Marking every test that uses database as slow

* Marking tests that import files as slow

* Marking gpg tests as slow

* Marking all versions and one list tests as slow

* Added more markers to unit tests + cli option to skip slow tests

Following a discussion with Axel, the generic 'slowtest' marker has been
split into 'db', 'network' and 'maybeslow'. A brief description of the
meaning of each marker has been added to pytest.ini.

A command line option to run only fast tests has been added to
'spack test'

* Don't use classes to group tests together

Reverted grouping tests under a class, as required in the review

* Minor style changes

1 files changed, 52 insertions, 0 deletions

diff --git a/conftest.py b/conftest.py
new file mode 100644
index 0000000000..85adf54d1d
--- /dev/null
+++ b/conftest.py
@@ -0,0 +1,52 @@
+##############################################################################
+# 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)