test_requirements: Test cases for checking requirements

This patch adds the test cases for checking whether the requirements
of Ryu has no conflict with that of other projects (e.g., the global
requirements of OpenStack)

Signed-off-by: IWASE Yusuke <iwase.yusuke0@gmail.com>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>

ryu/tests/unit/test_requirements.py

@@ -0,0 +1,85 @@
+# Copyright (C) 2016 Nippon Telegraph and Telephone Corporation.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import logging
+import os
+import sys
+import unittest
+
+import pkg_resources
+from pip.req import parse_requirements
+from pip.download import PipSession
+from six.moves import urllib
+
+from nose.tools import ok_
+
+
+LOG = logging.getLogger(__name__)
+
+MOD_DIR = os.path.dirname(sys.modules[__name__].__file__)
+_RYU_REQUIREMENTS_FILES = [
+    '../../../tools/pip-requires',
+    '../../../tools/optional-requires',
+]
+RYU_REQUIREMENTS_FILES = [
+    os.path.join(MOD_DIR, f) for f in _RYU_REQUIREMENTS_FILES]
+
+OPENSTACK_REQUIREMENTS_REPO = 'https://github.com/openstack/requirements'
+OPENSTACK_REQUIREMENTS_URL = (
+    'https://github.com/openstack/requirements/raw/master/')
+_OPENSTACK_REQUIREMENTS_FILES = [
+    'requirements.txt',
+    'global-requirements.txt',
+]
+OPENSTACK_REQUIREMENTS_FILES = [
+    urllib.parse.urljoin(OPENSTACK_REQUIREMENTS_URL, f)
+    for f in _OPENSTACK_REQUIREMENTS_FILES]
+
+
+def _get_requirements(files):
+    requirements = {}
+    for f in files:
+        req = parse_requirements(f, session=PipSession())
+        for r in req:
+            requirements[r.name] = str(r.req)
+
+    return requirements
+
+OPENSTACK_REQUIREMENTS = _get_requirements(OPENSTACK_REQUIREMENTS_FILES)
+RYU_REQUIREMENTS = _get_requirements(RYU_REQUIREMENTS_FILES)
+
+
+class TestRequirements(unittest.TestCase):
+    """
+    Test whether the requirements of Ryu has no conflict with that
+    of other projects.
+    """
+
+    def setUp(self):
+        pass
+
+    def tearDown(self):
+        pass
+
+    def test_with_openstack_requirements(self):
+        try:
+            for name, req in OPENSTACK_REQUIREMENTS.items():
+                if name in RYU_REQUIREMENTS:
+                    ok_(pkg_resources.require(req))
+        except pkg_resources.VersionConflict as e:
+            LOG.exception(
+                'Some requirements of Ryu are conflicting with that of '
+                'OpenStack project: %s' % OPENSTACK_REQUIREMENTS_REPO)
+            raise e