gh-131290: ensure that test files can be executed as standalone scripts

Lib/test/test_metaclass.py

@@ -297,4 +297,6 @@ def load_tests(loader, tests, pattern):
 
 
 if __name__ == "__main__":
+ # set __name__ to match doctest expectations
+ __name__ = "test.test_metaclass"
  unittest.main()

Lib/test/test_pyclbr.py

@@ -3,7 +3,9 @@
  Nick Mathewson
 '''
 
+import importlib.machinery
 import sys
+from contextlib import contextmanager
 from textwrap import dedent
 from types import FunctionType, MethodType, BuiltinFunctionType
 import pyclbr
@@ -22,6 +24,29 @@
 # is imperfect (as designed), testModule is called with a set of
 # members to ignore.
 
+
+@contextmanager
+def temporary_main_spec():
+ """
+ A context manager that temporarily sets the `__spec__` attribute
+ of the `__main__` module if it's missing.
+ """
+ main_mod = sys.modules.get("__main__")
+ if main_mod is None:
+ yield # Do nothing if __main__ is not present
+ return
+
+ original_spec = getattr(main_mod, "__spec__", None)
+ if original_spec is None:
+ main_mod.__spec__ = importlib.machinery.ModuleSpec(
+ name="__main__", loader=None, origin="built-in"
+ )
+ try:
+ yield
+ finally:
+ main_mod.__spec__ = original_spec
+
+
 class PyclbrTest(TestCase):
 
  def assertListEq(self, l1, l2, ignore):
@@ -145,8 +170,9 @@ def test_easy(self):
  self.checkModule('pyclbr')
  # XXX: Metaclasses are not supported
  # self.checkModule('ast')
- self.checkModule('doctest', ignore=("TestResults", "_SpoofOut",
- "DocTestCase", '_DocTestSuite'))
+ with temporary_main_spec():
+ self.checkModule('doctest', ignore=("TestResults", "_SpoofOut",
+ "DocTestCase", '_DocTestSuite'))
  self.checkModule('difflib', ignore=("Match",))
 
  def test_cases(self):
@@ -223,12 +249,13 @@ def test_others(self):
  with warnings.catch_warnings():
  warnings.simplefilter('ignore', DeprecationWarning)
  cm('sre_parse', ignore=('dump', 'groups', 'pos')) # from sre_constants import *; property
- cm(
- 'pdb',
- # pyclbr does not handle elegantly `typing` or properties
- ignore=('Union', '_ModuleTarget', '_ScriptTarget', '_ZipTarget', 'curframe_locals'),
- )
- cm('pydoc', ignore=('input', 'output',)) # properties
+ with temporary_main_spec():
+ cm(
+ 'pdb',
+ # pyclbr does not handle elegantly `typing` or properties
+ ignore=('Union', '_ModuleTarget', '_ScriptTarget', '_ZipTarget', 'curframe_locals'),
+ )
+ cm('pydoc', ignore=('input', 'output',)) # properties
 
  # Tests for modules inside packages
  cm('email.parser')

Lib/test/test_regrtest.py

@@ -2546,4 +2546,5 @@ def test_test_result_get_state(self):
 
 
 if __name__ == '__main__':
+ setup.setup_process()
  unittest.main()

Misc/NEWS.d/next/Tests/2025-03-17-19-47-27.gh-issue-131290.NyCIXR.rst

@@ -0,0 +1 @@
+Tests in :file:`Lib/test` can now be correctly executed as standalone scripts.