Fix inheritance order in BaseTestCase

With release of testtools 1.4.0 test ids do not contain test attrs anymore.
It is related to improper MRO.

Make proper inheritance order,
remove testresources dependency as unused,
add unit tests.

Corresponding fix in Tempest: 2474f41f10808c7283778b96f8693238ea21297f

Change-Id: Ife208c6e74f18bdcd86e47b05caad6dc8f53d779
Closes-Bug: #1398487

requirements.txt

@@ -3,4 +3,3 @@ Babel>=1.3
 fixtures>=0.3.14
 oslo.config>=1.4.0.0a3
 iso8601>=0.1.9
-testresources>=0.2.4

tempest_lib/base.py

@@ -15,32 +15,14 @@
 
 import logging
 import os
-import sys
 
 import fixtures
-import testresources
 import testtools
 
 LOG = logging.getLogger(__name__)
 
 
-if sys.version_info >= (2, 7):
-    class BaseDeps(testtools.TestCase,
-                   testtools.testcase.WithAttributes,
-                   testresources.ResourcedTestCase):
-        pass
-else:
-    # Define asserts for py26
-    import unittest2
-
-    class BaseDeps(testtools.TestCase,
-                   testtools.testcase.WithAttributes,
-                   testresources.ResourcedTestCase,
-                   unittest2.TestCase):
-        pass
-
-
-class BaseTestCase(BaseDeps):
+class BaseTestCase(testtools.testcase.WithAttributes, testtools.TestCase):
     setUpClassCalled = False
 
     # NOTE(sdague): log_format is defined inline here instead of using the oslo

tempest_lib/tests/test_base.py

@@ -0,0 +1,64 @@
+# Copyright 2014 Mirantis 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 testtools
+
+from tempest_lib import base
+from tempest_lib import exceptions
+
+
+class TestAttr(base.BaseTestCase):
+
+    def test_has_no_attrs(self):
+        self.assertEqual(
+            'tempest_lib.tests.test_base.TestAttr.test_has_no_attrs',
+            self.id()
+        )
+
+    @testtools.testcase.attr('foo')
+    def test_has_one_attr(self):
+        self.assertEqual(
+            'tempest_lib.tests.test_base.TestAttr.test_has_one_attr[foo]',
+            self.id()
+        )
+
+    @testtools.testcase.attr('foo')
+    @testtools.testcase.attr('bar')
+    def test_has_two_attrs(self):
+        self.assertEqual(
+            'tempest_lib.tests.test_base.TestAttr.test_has_two_attrs[bar,foo]',
+            self.id(),
+        )
+
+
+class TestSetUpClass(base.BaseTestCase):
+
+    @classmethod
+    def setUpClass(cls):
+        """Simulate absence of super() call."""
+
+    def setUp(self):
+        try:
+            # We expect here RuntimeError exception because 'setUpClass'
+            # has not called 'super'.
+            super(TestSetUpClass, self).setUp()
+        except RuntimeError:
+            pass
+        else:
+            raise exceptions.TempestException(
+                "If you see this, then expected exception was not raised.")
+
+    def test_setup_class_raises_runtime_error(self):
+        """No-op test just to call setUp."""