bpo-43224: typing: Add tests for pickling and copying of unpacked native tuple (GH-32159)

Author: mrahtz

Lib/test/test_genericalias.py

@@ -47,12 +47,44 @@
 from queue import Queue, SimpleQueue
 from weakref import WeakSet, ReferenceType, ref
 import typing
+from typing import Unpack
 
 from typing import TypeVar
 T = TypeVar('T')
 K = TypeVar('K')
 V = TypeVar('V')
 
+_UNPACKED_TUPLES = [
+    # Unpacked tuple using `*`
+    (*tuple[int],)[0],
+    (*tuple[T],)[0],
+    (*tuple[int, str],)[0],
+    (*tuple[int, ...],)[0],
+    (*tuple[T, ...],)[0],
+    tuple[*tuple[int, ...]],
+    tuple[*tuple[T, ...]],
+    tuple[str, *tuple[int, ...]],
+    tuple[*tuple[int, ...], str],
+    tuple[float, *tuple[int, ...], str],
+    tuple[*tuple[*tuple[int, ...]]],
+    # Unpacked tuple using `Unpack`
+    Unpack[tuple[int]],
+    Unpack[tuple[T]],
+    Unpack[tuple[int, str]],
+    Unpack[tuple[int, ...]],
+    Unpack[tuple[T, ...]],
+    tuple[Unpack[tuple[int, ...]]],
+    tuple[Unpack[tuple[T, ...]]],
+    tuple[str, Unpack[tuple[int, ...]]],
+    tuple[Unpack[tuple[int, ...]], str],
+    tuple[float, Unpack[tuple[int, ...]], str],
+    tuple[Unpack[tuple[Unpack[tuple[int, ...]]]]],
+    # Unpacked tuple using `*` AND `Unpack`
+    tuple[Unpack[tuple[*tuple[int, ...]]]],
+    tuple[*tuple[Unpack[tuple[int, ...]]]],
+]
+
+
 class BaseTest(unittest.TestCase):
     """Test basics."""
     generic_types = [type, tuple, list, dict, set, frozenset, enumerate,
@@ -351,13 +383,15 @@ class MyType(type):
             MyType[int]
 
     def test_pickle(self):
-        alias = GenericAlias(list, T)
-        for proto in range(pickle.HIGHEST_PROTOCOL + 1):
-            s = pickle.dumps(alias, proto)
-            loaded = pickle.loads(s)
-            self.assertEqual(loaded.__origin__, alias.__origin__)
-            self.assertEqual(loaded.__args__, alias.__args__)
-            self.assertEqual(loaded.__parameters__, alias.__parameters__)
+        aliases = [GenericAlias(list, T)] + _UNPACKED_TUPLES
+        for alias in aliases:
+            for proto in range(pickle.HIGHEST_PROTOCOL + 1):
+                with self.subTest(alias=alias, proto=proto):
+                    s = pickle.dumps(alias, proto)
+                    loaded = pickle.loads(s)
+                    self.assertEqual(loaded.__origin__, alias.__origin__)
+                    self.assertEqual(loaded.__args__, alias.__args__)
+                    self.assertEqual(loaded.__parameters__, alias.__parameters__)
 
     def test_copy(self):
         class X(list):
@@ -366,16 +400,21 @@ def __copy__(self):
             def __deepcopy__(self, memo):
                 return self
 
-        for origin in list, deque, X:
-            alias = GenericAlias(origin, T)
-            copied = copy.copy(alias)
-            self.assertEqual(copied.__origin__, alias.__origin__)
-            self.assertEqual(copied.__args__, alias.__args__)
-            self.assertEqual(copied.__parameters__, alias.__parameters__)
-            copied = copy.deepcopy(alias)
-            self.assertEqual(copied.__origin__, alias.__origin__)
-            self.assertEqual(copied.__args__, alias.__args__)
-            self.assertEqual(copied.__parameters__, alias.__parameters__)
+        aliases = [
+            GenericAlias(list, T),
+            GenericAlias(deque, T),
+            GenericAlias(X, T)
+        ] + _UNPACKED_TUPLES
+        for alias in aliases:
+            with self.subTest(alias=alias):
+                copied = copy.copy(alias)
+                self.assertEqual(copied.__origin__, alias.__origin__)
+                self.assertEqual(copied.__args__, alias.__args__)
+                self.assertEqual(copied.__parameters__, alias.__parameters__)
+                copied = copy.deepcopy(alias)
+                self.assertEqual(copied.__origin__, alias.__origin__)
+                self.assertEqual(copied.__args__, alias.__args__)
+                self.assertEqual(copied.__parameters__, alias.__parameters__)
 
     def test_union(self):
         a = typing.Union[list[int], list[str]]