Add durations to unittest in 3.12 (#10636)

stdlib/unittest/result.pyi

@@ -1,9 +1,12 @@
+import sys
 import unittest.case
 from _typeshed import OptExcInfo
 from collections.abc import Callable
 from typing import Any, TextIO, TypeVar
+from typing_extensions import TypeAlias
 
 _F = TypeVar("_F", bound=Callable[..., Any])
+_DurationsType: TypeAlias = list[tuple[str, float]]
 
 STDOUT_LINE: str
 STDERR_LINE: str
@@ -22,6 +25,8 @@ class TestResult:
     buffer: bool
     failfast: bool
     tb_locals: bool
+    if sys.version_info >= (3, 12):
+        collectedDurations: _DurationsType
     def __init__(self, stream: TextIO | None = None, descriptions: bool | None = None, verbosity: int | None = None) -> None: ...
     def printErrors(self) -> None: ...
     def wasSuccessful(self) -> bool: ...
@@ -37,3 +42,5 @@ class TestResult:
     def addExpectedFailure(self, test: unittest.case.TestCase, err: OptExcInfo) -> None: ...
     def addUnexpectedSuccess(self, test: unittest.case.TestCase) -> None: ...
     def addSubTest(self, test: unittest.case.TestCase, subtest: unittest.case.TestCase, err: OptExcInfo | None) -> None: ...
+    if sys.version_info >= (3, 12):
+        def addDuration(self, test: unittest.case.TestCase, elapsed: float) -> None: ...