gh-127196: Fix crash in `_interpreters`, when `shared` had invalid encodings (#127220)

1 files changed, 12 insertions, 1 deletions

diff --git a/Lib/test/test__interpreters.py b/Lib/test/test__interpreters.py
index bf3165e..fd444f1 100644
--- a/Lib/test/test__interpreters.py
+++ b/Lib/test/test__interpreters.py
@@ -557,7 +557,7 @@ class CommonTests(TestBase):
         self.id = _interpreters.create()
 
     def test_signatures(self):
-        # for method in ['exec', 'run_string', 'run_func']:
+        # See https://github.com/python/cpython/issues/126654
         msg = "expected 'shared' to be a dict"
         with self.assertRaisesRegex(TypeError, msg):
             _interpreters.exec(self.id, 'a', 1)
@@ -568,6 +568,17 @@ class CommonTests(TestBase):
         with self.assertRaisesRegex(TypeError, msg):
             _interpreters.run_func(self.id, lambda: None, shared=1)
 
+    def test_invalid_shared_encoding(self):
+        # See https://github.com/python/cpython/issues/127196
+        bad_shared = {"\uD82A": 0}
+        msg = 'surrogates not allowed'
+        with self.assertRaisesRegex(UnicodeEncodeError, msg):
+            _interpreters.exec(self.id, 'a', shared=bad_shared)
+        with self.assertRaisesRegex(UnicodeEncodeError, msg):
+            _interpreters.run_string(self.id, 'a', shared=bad_shared)
+        with self.assertRaisesRegex(UnicodeEncodeError, msg):
+            _interpreters.run_func(self.id, lambda: None, shared=bad_shared)
+
 
 class RunStringTests(TestBase):