1 files changed, 28 insertions, 0 deletions
diff --git a/tests/unittests/test_registry.py b/tests/unittests/test_registry.py
new file mode 100644
index 00000000..bcf01475
--- /dev/null
+++ b/tests/unittests/test_registry.py
@@ -0,0 +1,28 @@
+from cloudinit.registry import DictRegistry
+
+from .helpers import (mock, TestCase)
+
+
+class TestDictRegistry(TestCase):
+
+    def test_added_item_included_in_output(self):
+        registry = DictRegistry()
+        item_key, item_to_register = 'test_key', mock.Mock()
+        registry.register_item(item_key, item_to_register)
+        self.assertEqual({item_key: item_to_register},
+                         registry.registered_items)
+
+    def test_registry_starts_out_empty(self):
+        self.assertEqual({}, DictRegistry().registered_items)
+
+    def test_modifying_registered_items_isnt_exposed_to_other_callers(self):
+        registry = DictRegistry()
+        registry.registered_items['test_item'] = mock.Mock()
+        self.assertEqual({}, registry.registered_items)
+
+    def test_keys_cannot_be_replaced(self):
+        registry = DictRegistry()
+        item_key = 'test_key'
+        registry.register_item(item_key, mock.Mock())
+        self.assertRaises(ValueError,
+                          registry.register_item, item_key, mock.Mock())