Mixin for test cases

Provide mixin capable to initialize all framework subsystems. Moving all
initialization into this mixin increases framework code isolation. As
result it makes adding changes into framework easier.

Change-Id: Ib1154bc8e8bd69d36bfbdfb77de0b0d8ffafe1a8

ramdisk_func_test/__init__.py

@@ -0,0 +1,65 @@
+# Copyright 2016 Cray Inc., All Rights Reserved
+#
+#    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 collections
+import logging
+import unittest
+
+from ramdisk_func_test import environment
+
+
+__all__ = ['TestCaseMixin']
+
+LOG = logging.getLogger(__name__)
+
+
+class TestCaseMixin(unittest.TestCase):
+    _rft_config_path = None
+    _rft_template_path = []
+    env = None
+
+    @classmethod
+    def setUpClass(cls):
+        template_path = []
+        template_uniq = set()
+        for member in cls.__mro__:
+            try:
+                path = member._rft_template_path
+            except AttributeError:
+                continue
+
+            if isinstance(path, basestring):
+                path = [path]
+            elif isinstance(path, collections.Sequence):
+                pass
+            else:
+                path = [path]
+
+            uniq_path = set(path) - template_uniq
+            template_uniq.update(uniq_path)
+            template_path.extend(x for x in path if x in uniq_path)
+
+        cls.env = environment.Environment(template_path, cls._rft_config_path)
+        cls.env.setupclass()
+
+        super(TestCaseMixin, cls).setUpClass()
+
+    @classmethod
+    def tearDownClass(cls):
+        cls.env.teardownclass()
+        super(TestCaseMixin, cls).tearDownClass()
+
+    def tearDown(self):
+        self.env.teardown()
+        super(TestCaseMixin, self).tearDown()