func.__module__ was not copied anymore

2 files changed, 9 insertions, 4 deletions

diff --git a/src/tests/documentation.py b/src/tests/documentation.py
index 40b0a28..3ddc6a1 100644
--- a/src/tests/documentation.py
+++ b/src/tests/documentation.py
@@ -1852,14 +1852,13 @@ def to_method(f):
     self = inspect.Parameter('self', inspect.Parameter.POSITIONAL_OR_KEYWORD)
     params.insert(0, self)  # insert self
     del params[-1]  # remove context
-    newsig = sig.replace(parameters=params)
+    newsig = '%s%s' % (f.__name__, sig.replace(parameters=params))
     return FunctionMaker.create(
-        '%s%s' % (f.__name__, newsig),
-        'context = self.context; return _func_%s' % sig,
+        newsig, 'context = self.context; return _func_%s' % sig,
         dict(_func_=f))
 
 
-def foo(x, context):
+def foo(x, context=None):
     return x
 
 
diff --git a/src/tests/test.py b/src/tests/test.py
index ad45ca1..c10757d 100644
--- a/src/tests/test.py
+++ b/src/tests/test.py
@@ -69,6 +69,12 @@ class DocumentationTestCase(unittest.TestCase):
         err = doctest.testmod(doc)[0]
         self.assertEqual(err, 0)
 
+    def test_copy_dunder_attrs(self):
+        traced = doc.trace(doc.foo)
+        self.assertEqual(traced.__module__, 'documentation')
+        self.assertEqual(traced.__annotations__, {})
+        self.assertEqual(traced.__defaults__, (None,))
+
     def test_singledispatch1(self):
         with assertRaises(RuntimeError):
             doc.singledispatch_example1()