Merge pull request #8 from llllllllll/fix-default

BUG: actually allow people to override defaults

Author: Scott Sanderson

interface/tests/test_interface.py

@@ -527,6 +527,22 @@ def method2(self):
     assert C().has_default() == 3
 
 
+def test_override_default():
+
+    class IFace(Interface):  # pragma: nocover
+
+        @default
+        def default(self):
+            return 'ayy'
+
+    class C(implements(IFace)):  # pragma: nocover
+
+        def default(self):
+            return 'lmao'
+
+    assert C().default() == 'lmao'
+
+
 def test_conflicting_defaults():
 
     class IFace1(Interface):  # pragma: nocover

interface/typed_signature.py

@@ -21,6 +21,9 @@ class TypedSignature(object):
     """
     def __init__(self, obj):
         self._type = type(obj)
+        if self._type is default:
+            self._type = type(obj.implementation)
+
         self._signature = signature(extract_func(obj))
 
     @property