gh-76785: Fixes for test.support.interpreters (gh-112982)

This involves a number of changes for PEP 734.

1 files changed, 38 insertions, 0 deletions

diff --git a/Lib/test/test_interpreters/test_stress.py b/Lib/test/test_interpreters/test_stress.py
new file mode 100644
index 0000000..3cc570b
--- /dev/null
+++ b/Lib/test/test_interpreters/test_stress.py
@@ -0,0 +1,38 @@
+import threading
+import unittest
+
+from test import support
+from test.support import import_helper
+from test.support import threading_helper
+# Raise SkipTest if subinterpreters not supported.
+import_helper.import_module('_xxsubinterpreters')
+from test.support import interpreters
+from .utils import TestBase
+
+
+class StressTests(TestBase):
+
+    # In these tests we generally want a lot of interpreters,
+    # but not so many that any test takes too long.
+
+    @support.requires_resource('cpu')
+    def test_create_many_sequential(self):
+        alive = []
+        for _ in range(100):
+            interp = interpreters.create()
+            alive.append(interp)
+
+    @support.requires_resource('cpu')
+    def test_create_many_threaded(self):
+        alive = []
+        def task():
+            interp = interpreters.create()
+            alive.append(interp)
+        threads = (threading.Thread(target=task) for _ in range(200))
+        with threading_helper.start_threads(threads):
+            pass
+
+
+if __name__ == '__main__':
+    # Test needs to be a package, so we can do relative imports.
+    unittest.main()