Forgot to include a test for #844.

test/test_evaluate/test_mixed.py

@@ -0,0 +1,7 @@
+import jedi
+
+
+def test_on_code():
+    from functools import wraps
+    i = jedi.Interpreter("wraps.__code__", [{'wraps':wraps}])
+    assert i.goto_definitions()