gh-96478: Test @overload on C functions

python · Sep 1, 2022 · 189797f · 189797f
1 parent 894cafd
commit 189797f
Showing 1 changed file with 15 additions and 0 deletions.
diff --git a/Lib/test/test_typing.py b/Lib/test/test_typing.py
@@ -4391,6 +4391,21 @@ def blah():
 
         blah()
 
+    @patch("typing._overload_registry",
+        defaultdict(lambda: defaultdict(dict)))
+    def test_overload_on_compiled_functions(self):
+        # The registry starts out empty:
+        self.assertEqual(typing._overload_registry, {})
+
+        # This should just not fail:
+        overload(sum)
+        overload(print)
+
+        # No overloads are recorded (but, it still has a side-effect):
+        self.assertEqual(typing.get_overloads(sum), [])
+        self.assertEqual(typing.get_overloads(print), [])
+        self.assertNotEqual(typing._overload_registry, {})
+
     def set_up_overloads(self):
         def blah():
             pass