update test code and news

Lib/test/_test_multiprocessing.py

@@ -5,6 +5,7 @@
 import unittest
 import unittest.mock
 import queue as pyqueue
+import textwrap
 import time
 import io
 import itertools
@@ -5763,28 +5764,30 @@ def test_namespace(self):
 class TestNamedResource(unittest.TestCase):
     def test_global_named_resource_spawn(self):
         #
-        # Check that global named resources in main module
+        # gh-90549: Check that global named resources in main module
         # will not leak by a subprocess, in spawn context.
         #
-        with os_helper.temp_dir() as tmp_dir:
-            source = os.path.join(tmp_dir, 'source.py')
-            with open(source, 'w') as f:
-                f.write('''if 1:
-                    import multiprocessing as mp
+        testfn = os_helper.TESTFN
+        self.addCleanup(os_helper.unlink, testfn)
+        with open(testfn, 'w', encoding='utf-8') as f:
+            f.write(textwrap.dedent('''\
+                import multiprocessing as mp
 
-                    ctx = mp.get_context('spawn')
+                ctx = mp.get_context('spawn')
 
-                    global_resource = ctx.Semaphore()
+                global_resource = ctx.Semaphore()
 
-                    def submain(): pass
+                def submain(): pass
 
-                    if __name__ == '__main__':
-                        p = ctx.Process(target=submain)
-                        p.start()
-                        p.join()
-                ''')
-            rc, out, err = test.support.script_helper.assert_python_ok(source)
-            self.assertNotRegex(err, b'resource_tracker: There appear to be .* leaked')
+                if __name__ == '__main__':
+                    p = ctx.Process(target=submain)
+                    p.start()
+                    p.join()
+            '''))
+        rc, out, err = test.support.script_helper.assert_python_ok(testfn)
+        # on error, err = 'UserWarning: resource_tracker: There appear to
+        # be 1 leaked semaphore objects to clean up at shutdown'
+        self.assertEqual(err, b'')
 
 
 class MiscTestCase(unittest.TestCase):