bpo-45679: add tuple tests with lru_cache to test_functools (GH-29339)

Author: sobolevn

Lib/test/test_functools.py

@@ -1495,6 +1495,33 @@ def square(x):
             self.assertEqual(square.cache_info().hits, 4)
             self.assertEqual(square.cache_info().misses, 4)
 
+    def test_lru_cache_typed_is_not_recursive(self):
+        cached = self.module.lru_cache(typed=True)(repr)
+
+        self.assertEqual(cached(1), '1')
+        self.assertEqual(cached(True), 'True')
+        self.assertEqual(cached(1.0), '1.0')
+        self.assertEqual(cached(0), '0')
+        self.assertEqual(cached(False), 'False')
+        self.assertEqual(cached(0.0), '0.0')
+
+        self.assertEqual(cached((1,)), '(1,)')
+        self.assertEqual(cached((True,)), '(1,)')
+        self.assertEqual(cached((1.0,)), '(1,)')
+        self.assertEqual(cached((0,)), '(0,)')
+        self.assertEqual(cached((False,)), '(0,)')
+        self.assertEqual(cached((0.0,)), '(0,)')
+
+        class T(tuple):
+            pass
+
+        self.assertEqual(cached(T((1,))), '(1,)')
+        self.assertEqual(cached(T((True,))), '(1,)')
+        self.assertEqual(cached(T((1.0,))), '(1,)')
+        self.assertEqual(cached(T((0,))), '(0,)')
+        self.assertEqual(cached(T((False,))), '(0,)')
+        self.assertEqual(cached(T((0.0,))), '(0,)')
+
     def test_lru_with_keyword_args(self):
         @self.module.lru_cache()
         def fib(n):

Misc/NEWS.d/next/Tests/2021-10-31-10-58-45.bpo-45701.r0LAUL.rst

@@ -0,0 +1,2 @@
+Add tests with ``tuple`` type with :func:`functools.lru_cache` to
+``test_functools``.