bpo-39679: Add tests for classmethod/staticmethod singledispatchmethods

Lib/test/test_functools.py

@@ -2437,6 +2437,48 @@ def _(self, arg: str):
         self.assertEqual(a.t(''), "str")
         self.assertEqual(a.t(0.0), "base")
 
+    def test_staticmethod_type_ann_register(self):
+        class A:
+            @functools.singledispatchmethod
+            @staticmethod
+            def t(arg):
+                return arg
+            @t.register
+            @staticmethod
+            def _(arg: int):
+                return isinstance(arg, int)
+            @t.register
+            @staticmethod
+            def _(arg: str):
+                return isinstance(arg, str)
+        a = A()
+
+        self.assertTrue(A.t(0))
+        self.assertTrue(A.t(''))
+        self.assertEqual(A.t(0.0), 0.0)
+
+    def test_classmethod_type_ann_register(self):
+        class A:
+            def __init__(self, arg):
+                self.arg = arg
+
+            @functools.singledispatchmethod
+            @classmethod
+            def t(cls, arg):
+                return cls("base")
+            @t.register
+            @classmethod
+            def _(cls, arg: int):
+                return cls("int")
+            @t.register
+            @classmethod
+            def _(cls, arg: str):
+                return cls("str")
+
+        self.assertEqual(A.t(0).arg, "int")
+        self.assertEqual(A.t('').arg, "str")
+        self.assertEqual(A.t(0.0).arg, "base")
+
     def test_invalid_registrations(self):
         msg_prefix = "Invalid first argument to `register()`: "
         msg_suffix = (

Misc/NEWS.d/next/Tests/2021-10-18-16-18-41.bpo-39679.F18qcE.rst

@@ -0,0 +1,2 @@
+Add more test cases for `@functools.singledispatchmethod` when combined with
+`@classmethod` or `@staticmethod`.