Code coverage.

tests/test_context.py

@@ -0,0 +1,11 @@
+from twisted.trial.unittest import TestCase
+
+from carly import Context
+
+
+class TestContext(TestCase):
+
+    def testMultipleCleanupCalls(self):
+        context = Context()
+        context.cleanup()
+        context.cleanup()

tests/test_once.py

@@ -0,0 +1,14 @@
+from testfixtures.mock import Mock
+from twisted.trial.unittest import TestCase
+
+from carly import Once
+
+
+class TestOnce(TestCase):
+
+    def testSimple(self):
+        mock = Mock()
+        wrapped = Once(mock)
+        wrapped(1, two=3)
+        wrapped(4, five=6)
+        mock.assert_called_once_with(1, two=3)