From f89f4151b0f7a037786bdb5d63092dc74dbffac3 Mon Sep 17 00:00:00 2001
From: Stein Magnus Jodal <stein.magnus@jodal.no>
Date: Mon, 1 Apr 2013 11:02:02 +0200
Subject: [PATCH] ext: Add Extension base class

---
 mopidy/ext.py     | 27 +++++++++++++++++++++++++++
 tests/ext_test.py | 34 ++++++++++++++++++++++++++++++++++
 2 files changed, 61 insertions(+)
 create mode 100644 mopidy/ext.py
 create mode 100644 tests/ext_test.py

diff --git a/mopidy/ext.py b/mopidy/ext.py
new file mode 100644
index 00000000..dc756a3a
--- /dev/null
+++ b/mopidy/ext.py
@@ -0,0 +1,27 @@
+from __future__ import unicode_literals
+
+
+class Extension(object):
+
+    name = None
+    version = None
+
+    def get_default_config(self):
+        raise NotImplementedError(
+            'Add at least a config section with "enabled = true"')
+
+    def validate_config(self, config):
+        raise NotImplementedError(
+            'You must explicitly pass config validation if not needed')
+
+    def validate_environment(self):
+        pass
+
+    def get_frontend_class(self):
+        pass
+
+    def get_backend_class(self):
+        pass
+
+    def register_gstreamer_elements(self):
+        pass
diff --git a/tests/ext_test.py b/tests/ext_test.py
new file mode 100644
index 00000000..98849e21
--- /dev/null
+++ b/tests/ext_test.py
@@ -0,0 +1,34 @@
+from __future__ import unicode_literals
+
+from mopidy.ext import Extension
+
+from tests import unittest
+
+
+class ExtensionTest(unittest.TestCase):
+    def setUp(self):
+        self.ext = Extension()
+
+    def test_name_is_none(self):
+        self.assertIsNone(self.ext.name)
+
+    def test_version_is_none(self):
+        self.assertIsNone(self.ext.version)
+
+    def test_get_default_config_raises_not_implemented(self):
+        self.assertRaises(NotImplementedError, self.ext.get_default_config)
+
+    def test_validate_config_raises_not_implemented(self):
+        self.assertRaises(NotImplementedError, self.ext.validate_config, None)
+
+    def test_validate_environment_does_nothing_by_default(self):
+        self.assertIsNone(self.ext.validate_environment())
+
+    def test_get_frontend_class_returns_none_by_default(self):
+        self.assertIsNone(self.ext.get_frontend_class())
+
+    def test_get_backend_class_returns_none_by_default(self):
+        self.assertIsNone(self.ext.get_backend_class())
+
+    def test_register_gstreamer_elements_does_nothing_by_default(self):
+        self.assertIsNone(self.ext.register_gstreamer_elements())