fixup! pytester: typing for spawn/spawn_pytest

Author: blueyed

src/_pytest/pytester.py

@@ -18,6 +18,11 @@
 from typing import Optional
 from typing import Sequence
 from typing import Tuple
+
+try:
+    from typing import TYPE_CHECKING
+except ImportError:
+    from typing_extensions import TYPE_CHECKING
 from typing import Union
 from weakref import WeakKeyDictionary
 
@@ -35,7 +40,7 @@
 from _pytest.pathlib import Path
 from _pytest.reports import TestReport
 
-if False:  # TYPE_CHECKING
+if TYPE_CHECKING:
     from typing import Type
 
     import pexpect