From 45247eb4b38a76a7837f68f97c7ccebae488ea0e Mon Sep 17 00:00:00 2001
From: Martin Chlumsky <martin.chlumsky@gmail.com>
Date: Wed, 15 Apr 2015 13:09:59 -0400
Subject: [PATCH] Use abc for BaseCacheModule

---
 v2/ansible/plugins/cache/base.py | 30 ++++++++----
 v2/test-requirements.txt         |  2 +
 v2/test/plugins/test_cache.py    | 82 ++++++++++++++++++++++++++++++++
 3 files changed, 105 insertions(+), 9 deletions(-)
 create mode 100644 v2/test/plugins/test_cache.py

diff --git a/v2/ansible/plugins/cache/base.py b/v2/ansible/plugins/cache/base.py
index 6ff3d5ed1e2..051f02d0b00 100644
--- a/v2/ansible/plugins/cache/base.py
+++ b/v2/ansible/plugins/cache/base.py
@@ -14,30 +14,42 @@
 #
 # You should have received a copy of the GNU General Public License
 # along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
+
 from __future__ import (absolute_import, division, print_function)
 __metaclass__ = type
 
-import exceptions
+from abc import ABCMeta, abstractmethod
+
+from six import add_metaclass
+
 
-class BaseCacheModule(object):
+@add_metaclass(ABCMeta)
+class BaseCacheModule:
 
+    @abstractmethod
     def get(self, key):
-        raise exceptions.NotImplementedError
+        pass
 
+    @abstractmethod
     def set(self, key, value):
-        raise exceptions.NotImplementedError
+        pass
 
+    @abstractmethod
     def keys(self):
-        raise exceptions.NotImplementedError
+        pass
 
+    @abstractmethod
     def contains(self, key):
-        raise exceptions.NotImplementedError
+        pass
 
+    @abstractmethod
     def delete(self, key):
-        raise exceptions.NotImplementedError
+        pass
 
+    @abstractmethod
     def flush(self):
-        raise exceptions.NotImplementedError
+        pass
 
+    @abstractmethod
     def copy(self):
-        raise exceptions.NotImplementedError
+        pass
diff --git a/v2/test-requirements.txt b/v2/test-requirements.txt
index ca5bcae0d98..100bdd01a00 100644
--- a/v2/test-requirements.txt
+++ b/v2/test-requirements.txt
@@ -5,6 +5,8 @@ jinja2
 httplib2
 passlib
 six
+python-memcached
+redis
 
 # Test requirements
 unittest2
diff --git a/v2/test/plugins/test_cache.py b/v2/test/plugins/test_cache.py
new file mode 100644
index 00000000000..b1273874cd3
--- /dev/null
+++ b/v2/test/plugins/test_cache.py
@@ -0,0 +1,82 @@
+# (c) 2012-2015, Michael DeHaan <michael.dehaan@gmail.com>
+#
+# This file is part of Ansible
+#
+# Ansible is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# Ansible 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
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
+
+# Make coding more python3-ish
+from __future__ import (absolute_import, division, print_function)
+__metaclass__ = type
+
+from ansible.compat.tests import unittest
+from ansible.plugins.cache.base import BaseCacheModule
+from ansible.plugins.cache.memcached import CacheModule as MemcachedCache
+from ansible.plugins.cache.memory import CacheModule as MemoryCache
+from ansible.plugins.cache.redis import CacheModule as RedisCache
+
+
+class TestAbstractClass(unittest.TestCase):
+
+    def setUp(self):
+        pass
+
+    def tearDown(self):
+        pass
+
+    def test_subclass_error(self):
+        class CacheModule1(BaseCacheModule):
+                pass
+        with self.assertRaises(TypeError):
+            CacheModule1()
+
+        class CacheModule2(BaseCacheModule):
+            def get(self, key):
+                super(CacheModule2, self).get(key)
+
+        with self.assertRaises(TypeError):
+            CacheModule2()
+
+    def test_subclass_success(self):
+        class CacheModule3(BaseCacheModule):
+            def get(self, key):
+                super(CacheModule3, self).get(key)
+
+            def set(self, key, value):
+                super(CacheModule3, self).set(key, value)
+
+            def keys(self):
+                super(CacheModule3, self).keys()
+
+            def contains(self, key):
+                super(CacheModule3, self).contains(key)
+
+            def delete(self, key):
+                super(CacheModule3, self).delete(key)
+
+            def flush(self):
+                super(CacheModule3, self).flush()
+
+            def copy(self):
+                super(CacheModule3, self).copy()
+
+        self.assertIsInstance(CacheModule3(), CacheModule3)
+
+    def test_memcached_cachemodule(self):
+        self.assertIsInstance(MemcachedCache(), MemcachedCache)
+
+    def test_memory_cachemodule(self):
+        self.assertIsInstance(MemoryCache(), MemoryCache)
+
+    def test_redis_cachemodule(self):
+        self.assertIsInstance(RedisCache(), RedisCache)